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How to test ac clutch relay


how to test ac clutch relay The air conditioning clutch relay transfers power, like a switch, from the interior A/C controls of an automobile to the A/C compressor, engaging the compressor clutch. It should Feb 12, 2015 · I decided to do a quick test before spending much time and bough a small can of R-134a, hook it up, turn car and ac switch on then connect the clutch straight to the battery, the compressor when on and even got some ( not much ) cold air inside the car. You can check the compressor clutch using the auto active test of   Check the engine coolant temperature (use the Honda PGM Tester PGM-FI data list if 2 terminal of the compressor clutch relay 5P socket and body ground. All AC components engaging and working the way they should, then the AC CLUTCH RELAY is the next way to go. 14 Jul 2015 This is the definitive test of the clutch itself as there is nothing else between the clutch and the control circuit from pin 2 of the relay box. The contacts for this relay also turn on the blower, so if the blower is working but the magnetic clutch is not pulling in, the problem can not be the relay. I’d check for power directly to the clutch coil (maybe you have if I follow correctly) because there are other parts of the circuit that could be causing a an open besides the relay. That some how the internal (in the power distribution box) jumper to pin 3 (switch leg) on relay # 23 (fan clutch relay) to fuse 30 has become disconnected. Mar 28, 2017 · The air conditioner (A/C) relay, is a relay used to send electrical power to the air conditioning compressor, and air conditioning compressor clutch when the system is turned on. After checking the coolant level and replacing the AC compressor relay, it's just  First, you need to know that, is your AC compressor relay really need to be fixed or it needs to be replaced. I can not  28 Mar 2017 The air conditioner (A/C) relay, is a relay used to send electrical power to the air conditioning compressor, and air conditioning compressor clutch when the This is another reason testing is important, as the relay could seem  Hello everyone, My wife owns an 03 Vibe and the AC stopped working. Think of it as a switch that is responsible for engaging and disengaging the AC compressor pulley from its compressor drive. Inspect magnetic clutch relay (marking: mg clt) Remove the magnetic clutch relay from the engine room no. Fuse box diagram (location and assignment of electrical fuses and relays) for Pontiac Torrent (2005, 2006, 2007, 2008, 2009). Discussion Starter • #1 • Mar 26, 2012 RE: AC Relay? IP: Logged Message: There is a relay in the PDC. I'm guessing it's the A/C clutch relay in the fuse box, looking at the compressor not spinning. A resistance meter should indicate that there is some resistance between 1 and 2, to show that the coil has continuity. If not, check fuse 21 in the PDC & if good pull the a/c relay & see that you have 12v power to terminal 30. If the fuse is good, then the problem might with the clutch relay which located in the same fuse box. If you are wrestling with the known defective relay, I believe if you check the diagram it is the one labeled "M/C. The Powertrain Control Module controls the relay by grounding the control circuit through an internal solid-state device called a driver. In isolated situations where the AC compressor clutch relay has a unique part number we test it the old-fashioned way. The only way to troubleshoot a capacitor is by replacing it and testing the unit, As with the capacitor, the HVAC technician may try replacing the start relay,  23 Jun 2012 went back to the relay area and started to test voltage. The purpose of the A/C clutch relay control circuit is to control the operation of the air conditioning. Where is the AC relay located on a 2000 Ford Expedition? Answer: The A/C clutch relay is in location 204 of the power distribution box in the engine compartment ( half size relay) - also in PD BOX - fuse # 13 - 15 amp for A/C clutch Relay and location # 502 is the A/C clutch DIODE Sep 17, 2013 · I have a 2003 Jetta GL. If you do not have an account but would like to check the status of an order, A/C Compressor Clutch Relay Connector. When the compressor clutch is disengaged, the magnetic field in the compressor coil collapses rapidly which induces back EMF in the coil windings. If the relay is malfunctioning, then it is also possible to narrow down the actual component causing the problem. IPDM E/R operates A/C relay when A/C compressor request signal is received from ECM via CAN communication line. Aug 13, 2016 · To test the clutch I was talking about going underneath the truck and disconnecting the clutch wire connector and applying 12 volts _there_. but theres an ac relay toohow do u test that and what else should i check to get the punp to kick on? Rock Auto 5% Discount Code:  5 May 2015 or jump 12v to the red on the compressor and see if the clutch spins? if Check the continuity of the clutch and coil, verify you a/c comp relay is  30 Dec 2011 *AC comp Clutch relay is good. An evaporator discharge air temperature sensor is used to disengage the A/C compressor clutch when the evaporator core temperature falls below 4°C (39°F). When I jump the AC relay I am able to engage the compressor and get cold air, pressure at rest is about 105 pounds at 60 degree F. A/C clutch relay circuit is monitored when ignition is on and battery voltage is The other two are as an isolation device where we need to protect a circuit from a second voltage supply and as a clamping device - this is the use when a diode is placed across a compressor clutch. Jun 11, 2008 · The ac button is now blinking, I can hear the engine start to idle up when you hit the ac button, But I am not hearing the compressor clutch kick in and of course Im not getting cold air. The A/C compressor clutch connector links the compressor clutch to the vehicle's electrical system. Anybody know the location or numbering on the relay? In isolated situations where the AC compressor clutch relay has a unique part number we test it the old-fashioned way. I removed the connector at the relay (to do this slide the red tab sideways from the connector and it slides out easily). Since you've checked AC relay and fuse, check to confirm 12V is arriving at compressor clutch connector. It could also be the low pressure switch, if there is no R134a coolant in the system the low pressure switch prevents the compressor from coming on. Apr 23, 2014 · the way i understand it, when the R134a is too low, when you recharge the system, the A/C clutch might not engage by itself. Mar 07, 2015 · The clutch setup on these compressors is not overly apparent whether the clutch is turning or not. 22 Apr 2016 Also diagnosis and testing procedures for your AC Compressor Clutch coil or stator, Low pressure switch, high pressure switch and your a/c  26 Jul 2017 Test for AC Compressor Clutch Function. Also diagnosis and testing procedures for your AC Compressor Clutch coil or stator, If the clutch coil shorts out, the positive wire may begin to heat when it touches the positive battery post. Tomlinson's schematic shows the AC relay energized through IGN E, a 10amp fuse with the other end tied to VCM pin 1; the AC control (dark green/white). I did find that Accessory Relay 2 has something to do with the AC/fans so it might be worth checking it. If you apply battery voltage to terminals "1" and "2" of the relay, there should be close to zero resistance across the relay contacts "3" and "5". I checked all fuses, swapped the ac clutch relay and the condenser fan relay, but the clutch still won’t engage. The climate control assembly sends an A/C request signal to the instrument cluster module which relays the request to the PCM. Remove the component from the socket and test for a power signal and a good ground at the proper terminals. Although it's never fun when  26 Jul 2019 When testing these relays: Unplug the relay; Measure for continuity between pins 30 and 87a. When you remove the AC relay listed as A/C Magnetic Clutch Relay on the wiring diagram see if you can locate the two coil terminals. I also have about 50 psi on the low side with the cheap gauge I am using so I think Im a little full. Fans come on if jumped from pressure switch (and when they are supposed to-when I turn on the AC); fuses on battery look as good as new; current simply "lopes" on and off; on and off; on and off. Although this is rarely the root cause of an air conditioning problem, a blown fuse or damaged relay could be the reason why the A/C stopped blowing cold. By using a relay, the high-current electromagnetic compressor clutch can be  6 Jan 2016 Almost every single electrical system on a car is powered through some kind of switch or electrical relay, and the AC system and compressor  Here we'll discuss how to diagnose a failed compressor relay and point to some of the automobiles that commonly enjoy this problem. If the AC clutch fails to energize then it would mean that you have a problem with power, ground, thermal protector switch, or the magnetic clutch. 25 Jun 2014 When you remove the AC relay listed as A/C Magnetic Clutch Relay on the wiring diagram see if you can locate the two coil terminals. The blower motor works, condenser fan works; I jumped the pressure switch on the receiver drier, the clutch still didn’t engage. Make sure the A/C CLU fuse in the under hood box is good, swap the A/C CLU relay with another one in the box. Because most of the cases, the problem in AC  Check all connections, the compressor head gasket, oil filter plug, and the shaft open, the rec door is driven closed to outside air, and the AC clutch relay is  Buy products related to air conditioner relay products and see what If you check the item description it is compatible for a few relay replacement numbers. There are many of these placed throughout the A/C system so one bad part could cause a chain reaction that could potentially cripple the entire system. Jul 13, 2020 · P0645 2012 FORD FUSION Description The Powertrain Control Module monitors the Air Conditioning Clutch Relay (A/CCR) circuit. Good news right? Also in the good news category, the horn in the 9-3 shares the same relay as the AC compressor, so i swapped the two. How can you test a compressor clutch? Testing the air conditioning compressor clutch in a Chevrolet starts with a voltage test. If the relay is manufactured by Omron, replace the relay and any other components damaged as a result of the relay failure. Probe the wire from the relay   The relay in your car or light truck's air conditioning system controls the compressor. Symptoms of Wear or Failure of the A/C Relay Apr 10, 2017 · An AC clutch compressor is a type of compressor that derives its power from the car engine’s flywheel. If there's no clutch operation, the A/C fuse, clutch relay, and control device must be ruled out. Any suggestions on where the issue maybe? Jul 11, 2018 · Check which type of compressor magnetic clutch relay is fitted to the fuse box. Nov 11, 2010 · Find a cheap set of gauges if you know how to use them or get a shop to check your pressures. That said, if the compressor is indeed running, and you have some freon in the system, you should be getting some cooling from it. So if I continue with the chart (as if the relay isn't cycling, I remove the relay, and jump two of the pins on the harness to see if the clutch engages, but it doesn't. Knowing when your AC compressor is running or not is critical to diagnosing the AC system, but also for charging the Nov 26, 2018 · Go on to check the fuse if you cannot read the voltage readings. If switching ac request there and relay has power on A4 pin pink wire ign mini fuse and orange wire B4 ac compressor fuse. AIR CONDITIONING – MAGNETIC CLUTCH RELAY AC–107 AC MAGNETIC CLUTCH RELAY ON-VEHICLE INSPECTION 1. I was expecting to get 12V to ar least one pin I tested the fuse and the ac clutch relay which both are fine. Mar 09, 2011 · If the fuse and wiring are intact, there should be power to the compressor clutch, with the jumper installed. Billy says: If the clutch only works when you hot wired it your system “may” be low on refrigerant so that the low pressure cut out switch won’t allow the clutch to engage, or a relay or fuse is preventing current from reaching the coil. At this point I'm stuck on  11 Aug 2010 to the A/C compressor clutch, verify that the relay and fuses are good, and With either system, the blower motor circuit testing is the same. The relay is OK as I have switched it with two others in the fuse box that I know are working with no change, so I know the contacts are OK. In there is also 3 identical relays, Brand New Air Conditioner Relay fits Lexus, Pontiac, Scion, and Toyota vehicles from 1997-2012. I think it may be relay #384 and it would be located in the relay panel under the dash behind the fuse panel. The Diagnostic Trouble Code (DTC) when the PCM grounds the Air Conditioning Clutch Relay circuit, excessive current draw is detected on the Air Conditioning Clutch Relay circuit; or, with the Air Conditioning Clutch Relay circuit not grounded by the PCM, voltage is not Feb 02, 2015 · where is ac compressor clutch relay(or compressor relay)?i can't find it on google. Nothing done on the AC system at all since I have owned it (bought new), and it has a full charge (checked with gauges on the rare time it did run. 20 Aug 2016 Fan control relay and A/C compressor clutch relay are in auxiliary under hood relay box A You will need to test your AC system a bit more. Is there a compressor relay??? 24 Apr 2013 An air conditioner can't work without a functioning compressor. It is mounted in the low pressure side of the AC system and its purpose is to detect the flow of The fuse for the AC compressor is under the hood as well as the relay that controls the compressor. Jun 29, 2012 · The only time I hear the ac compressor clutch, and ac relay click is when I check for power with a test light on circuit a495. Next step is this: "Check voltage at pin 'A' of compressor clutch" Remove the AC relay and in the relay socket, place a small jumper wire between pins 50 and 52 (check underneath the relay to identify the pins). 30 Jul 2015 I check for power at clutch relay…12 volts at feed to clutch and 12 volts at the coil side of relay. where t … read more Jul 14, 2009 · The AC clutch relay seems to be a high failure item for this car. If continuity does not exist, repair open Black wire between A/C compressor clutch relay connector and ground. Check the ac clutch relay, check to see if the relay works and then check the relay control signal, probably a ground controlled circuit. The AC compressor relay is no different then other electrical relays - its electrical contacts will eventually wear or burn out, and the relay must be replaced . It show that it is a light green wire coming from the HVAC control module, section "B-12" on my schematic. Any idea if an 08 Jeep Patriot even has an ac clutch relay or if it's just called something else. Ohmmeter Battery I100429E01 Tester Connection DTC P0645 Air Conditioning (A/C) Clutch Relay Control Circuit. Jul 07, 2020 · Replacing the bigger and more expensive parts can be meaningless and time consuming if you have a faulty relay, sensor, or switch that is preventing the proper function of that particular part. Testing the relay requires the use of an automotive circuit tester because many of today's computer-controlled cars and trucks use the computer to The AC compressor relay is responsible for supplying power to the AC compressor and clutch. You can test the clutch by locating the relay located in the engine side fuse panel, then jump the power to the clutch pin. Oct 22, 2015 · If the fuse is good, pull the compressor clutch relay and check for power and ground on the relay control coil terminals in the socket. Since the relay is constructed with a relay block that is in the junction block as a unit, it is impossible to disconnect the wire harness connecting with the relay block. It just seems way too coincidental that your A/C took a serious crap when you were working so close to the electronics. Apr 01, 2020 · First, did you check the ac relay? You can usually swap the horn relay with the ac relay to test if its bad. I'm not an AC guy but it's nice to have when the wife and daughter is in the truck The P0483 code is for the fan clutch. Jan 06, 2016 · The AC compressor relay is responsible for supplying power to the AC compressor and clutch. As low current passes through the coil, a magnetic field is created that draws the relay's arm towards the high current circuit. Knowing when your AC compressor is running or not is critical to diagnosing the How to Fix your Car's AC System - Compressor Coil, Clutch Relay, Low and High Pressure Switches. When the relay is activated the AC condenser fan is switched on so that it can keep the AC condenser cool. 7 Oct 2017 I decided to check the compressor relay, by swapping the relay between the ac compressor and the horn, since they are very similar. So the line is open somewhere, will let you more soon, will work compressor clutch relay connector and ground. 11 Jun 2018 dyall have INPA or ISTA+ yet ??? >in both INPA and ISTA you can actuate your ac compressor/coolant fan to test your circuit etc >your coolant fan  The first question that is asked is whether or not the AC relay cycles. The AC condenser is designed to cool down and condense incoming refrigerant vapor into cooled liquid and uses the fan to help keep it Jun 13, 2017 · The a/c magnetic clutch relay is in the under hood No. Power for the compressor clutch comes from one of the TIPM circuit boards, through connector C1, pin 50. AAMCO recommends having the system checked and charged, as operating an air conditioning system in this condition causes further damage. how can I test to see if it is the compressor or just the clutch or relay? With the limited visability I only see a two wire plug going to the compressor and nothing obvious between the compressor and clutch. It is controlled by a clutch system wherein its shaft is connected and disconnected to the rotating shaft of the flywheel by an electromagnetic switch. Check for leaks in your AC system - look for leaks from the condensor, reciever, or any areas where the metal piping connections are made. I am aware that these systems are run through the ECM so am wondering if the clutch will not engage because there is no pressure in the lines. But when I tried with the reverse light's relay (which is exactly the same) it's not worked, but the original relay worked fine with the reverse light. In order for ECM to ground the LB/OR wire ECM has to see the AC pressure sensor signal and the AC demand signal. In a few car models, the power of the air conditioning system flows from the AC switch to the fuse before being transmitted to the clutch oil through the low-pressure evaporator temperature. Jun 23, 2015 · Put compressor /clutch assembly back in car and clutch would not engage with the ac switch. I had evacuated/recharged the system just a week before, so I was really looking for a catastrophic failure of a hose or compressor. When the compressor is running it drops to 35 Jul 13, 2020 · P0645 2011 FORD FUSION Description The Powertrain Control Module monitors the Air Conditioning Clutch Relay (A/CCR) circuit. Remove the plug, and with the A/C running, test the charging system voltage at the harness connector. Here at Advance Auto Parts, we work with only top reliable Air Conditioning Relay product and part brands so you can shop with complete confidence. If still no fix you can test the relay circuit by adding a short 6 inch wire to the relay pick (activate) pin B5 and then reinsert the relay in the panel. However, I felt like if I'm at a low coolant level on a car that's only 3 years old, there must be a leak so I did not use any of the r-121a. My relay opens after about 15m of operation, yet if I jumper the relay the clutch engages and blows cold air. May 30, 2014 · The relay switch that your looking is not under the hood but it is however under driver side panel. *If I provide power *If I test for power at the relay block, I am not getting a switch signal (to switch the relay on). Could The clutch failed to activate during the door switch computer test, it did not engage when directly supplied with 12v when jumpered to the battery, and now it measures Infinity measuring across the two pins on the compressor meaning it definitely has a bad coil or something internal. Open left hand/driver Yo can swap the a/c relay with the fog lamp, or one of the fan relays they are all the same . The next stop for that electrical path according to the wiring diagram I have is the AC clutch relay/control module. We are constantly evolving to give  Find a cheap set of gauges if you know how to use them or get a shop to check your pressures. I jumped the feed side of the relay and get power  That just leaves the ground wire between the coil and the relay box. Wiring varies  1 Aug 2011 Your car should be running with the AC on to check the compressor Check the associated fuse/relay, and then diagnose the motor itself via  Test and diagnose AC compressor clutch control systems; determine necessary action the AC compressor clutch relay is controlled by the HVAC control head. To test, unplug the electrical connector at the clutch coil and test for battery voltage with the AC turned on. You can test the clutch by locating the relay located in the engine side fuse panel, when the pressure gets low (I believe), it tells the A/C compressor to kick on. I tested the connector to the compressor and am only getting 200mV to one pin and none to the other two pins. Get in the car with the driver's door open, turn the ignition on, push the driver's door switch 10 times, turn ignition off and then back on. If the relay is good, then the problem might be with the low pressure switch mounted in the low pressure line. The ac relay to the compressor only supplies the 12 volt power to the compressor through the clutch coil, when it is pulled in by the HVAC control module. Under the hood, I took out the A/C Relay fuse and jumper a wire from one prong to another and the AC clutch engages right away but it won't turn off (because the wire is not a relay) I replaced the relay with a new one bought from Autozone and it still doesn't work. (b) Check continuity between terminals when refrigerant pressure is changed, as shown in the illustration. should be a 10 amp fuse at location 21 and another 10 amp fuse at location 11 to power the relay coil and contact sides the relay coil side grounds via the PCM (dark blue/orange tracer wire) when the heater controls are set to AC position Jun 06, 2018 · I replaced the AC clutch relay as well just to be sure. The A/C compressor clutch engages the A/C compressor to pump refrigerant through the heat transfer cycle when the A/C is switched on in the cabin. no bad fuses bmw e39 2002 525i 150k miles May 21, 2017 · You will need a test light or power probe for this part of the testing. The condenser fan relay is the electronic relay that controls the power to the AC condenser cooling fan. There is no relay as such, the clutch is operated by the control module, i would first check fuses as indicated in the pic below, start here. I made sure to check the other lead from the coil that is tied to the body of the compressor, that was in good condition mechanically. Refer to this relay diagram to determine which pins in the socket should have battery voltage when the key is in the RUN position and which should have ground when the high and low pressures are within limits. Watch the clutch and listen for it to Jul 30, 2019 · I recall a long time ago puzzling on this a bit, too. I'd start by checking the clutch relay (labelled as MG CLT) located in the engine bay junction box; you can swap it with the horn relay (they are the same) and test the compressor one simply by blowing the horn. It is possible that either clutch is open (failed coil), failed thermal fuse on compressor, or excessive clutch gap preventing clutch from closing. I used a voltmeter to verify that I was in fact getting 12V at the relay contact that gets 12V from the fuse. The other two are as an isolation device where we need to protect a circuit from a second voltage supply and as a clamping device - this is the use when a diode is placed across a compressor clutch. Relay 23 is now back into play with the PCM , A/C clutch cycling pressure switch and the A/C high pressure switch. the ground path is internal to the VCM and being activated whenever you turn ON the AC switch on the panel. The clutch uses a 4-pin micro relay (pins 85-86 are the pull-down/fuse, pins 87 and 30 are the switch). Not sure how the electrical is set up on it if the power comes through the The relay is OK as I have switched it with two others in the fuse box that I know are working with no change, so I know the contacts are OK. The AC clutch relay is located next to the negative battery post in the fuse box under the hood on the driver's side fender. If a bad relay has caused excessive clutch surface wear, then replacing a defective relay might not resolve a poor AC performance issue because the clutch might still not work properly. 1997-1998: Daytime Running Lamp Module, Torque Converter Clutch Solenoid, Duty Cycle EVAP/Purge Solenoid, Air Conditioner Compressor Clutch Relay, Immobilizer Module, EVAP Leak Detection Pump, Powertrain Control Mudele, Automatic Shut Down Relay, Fuel Pump Relay, Rear Window Defogger Relay; T he compressor relay's purpose is to start the compressor. Best Match, Most Popular, Top Rated, Price (Low - High), Price (High - Low), Name (A - Z), Name (Z - A)  for Ship to Home, and shipping is free on all online orders of $35. Aug 06, 2019 · With the relay in the configuration that has the 2 load pins connected, place the test voltage on 1 of the load pins of the relay and an automotive test light on the other load pin of the relay. The high pressure side is not a switch, its a transducer, the BCM controls the on/off cycle of the compressor. Instructions Jul 16, 2020 · The location of the ac clutch relay on the 2012 toyota corolla is in the fuse box next to the battery. If the above looks okay, check the fuses: S4(5amp) = Located on the left side of dash S42(40/60amp) = Located above relay panel in dash Ac Magnetic Clutch Relay Location On 2003 Lx470 Ih8mud Forum Blown Fuse Check 2003 2009 Toyota 4runner 2008 Toyota 4runner Sr5 Answer: Use a test light to check fuses. Also your Cruise Fuse (the one powering the A/C relay coil thorough the two pressure switches connected in serial with the relay coil) is fine, also your A/C Comp. tested voltage to clutch compressor and it goes on and off as well as if something is telling the compressor not to come on The AC clutch relay is connected via a Blue/Yellow and black pair of wires to two different connectors under the TIPM. According to the tech manual, the next step is to put a 1/4 can of freon into the system, then test if the clutch will engage. Standard resistance Check wire harness (air conditioning amplifier - battery) Disconnect the e37 amplifier connector. Sounds like the clutch is faulty, although per the wiring diagram I have there is a thermal overload on the compressor that is wired in series with the clutch so that could be a problem, but either way it looks like I'm going to have to pull the compressor The test from the manual to see if the speed sensor is working correctly is aiming a water hose on the A/c Clutch. Jul 26, 2019 · If you are experiencing issues with your AC system and suspect that your AC relay has either failed or is beginning to fail, we recommend having it diagnosed by a professional technician. I have c Jun 16, 2015 · There IS pressure in the system, all I did to check this was push the schrader valve a bit. Here's a simply way to test the actual relay mounted in the relay box Jun 01, 2019 · Amazon Link AC Relays (Honda) - https://amzn. There are only 2 Pin Sockets in Connector, (Signal and Ground to Relay/ECU) Creates Closed Circuit to Relay and Body ECU. As a difference between the car’s clutch and AC compressor clutch, the last one can be fully engaged or not, partially is not possible. A/C Compressor Cut-Out Relay  Can someone inform me where the AC Compressor Clutch relay is physically is there a test procedure that I can see if this sensor is in proper working order. The refrigerant level appears to be ok Ford F-150 2007, A/C Compressor Control Relay by Four Seasons®. Jun 16, 2004 · Well, I listened at the relay while my wife turned cycled the AC on and off but I don't hear any click. Can anyone confirm where the clutch control relay is located as I'd like to test it and based on my research 4. In order to check to see if the relay's coil is good or bad, one of the best methods is to check its resistance. Electromechanical relays are circuit protection and control devices used by the PCM and  20 May 2010 Inside the block where the relay was located, there should be wires that supply the power to the relay. Toyota Corolla 99 03 Ac Clutch Not Engaging Ac Clutch Relay Not 2010 2019 Toyota 4runner Interior Fuse Check 2015 Toyota 4runner Oct 22, 2014 · If the fan does not operate check the Measuring Value Block(MVB) Group 135, field 2 will show you in (%) the current fan output speed from the ECM. Instructions May 18, 2017 · The clutch relay coil is supplied with +12V on one side, and grounded by the AC Amplifier (control module) to activate. There is a pressure switch which detects that there is enough gas and if not the ac clutch won't engage. If your A/C clutch doesn't engage, or never disengages, you may have a problem with your A/C clutch relay. In the photo below the compressor is labeled "A", the relay is located in the terminal box which is located at the position labeled "B". 5 ton, 60,000 BTU central air conditioning compressor that was short cycling, and  12 May 2019 Hi, My 2018 Civic's A/C is just giving hot air. If you can manually engage the clutch by doing this, you can prove whether the clutch is working correctly. I'm guessing you have a 2000 Passat and you're asking about the Air Conditioning compressor clutch relay. This wasn't necessary to test the clutch relay, but if I wasn't getting 12V there, maybe my problem was the AC clutch fuse in the awful to access under dash fuse block. The ac relays commonly used for A/C compressors, starters, headlights, horns, fans, and other accessories. Lisa Lisa If it is getting 12V when the AC is supposed to be engaging then you have a potentially serious problem. Probe the ignition feed circuit at the A/C relay terminal (switch side of relay) with the test lamp J 34142-B to a ground. When the AC clutch doesn’t meet the belt correctly you’ll have similar symptoms to low refrigerant charge… warm air, revs dropping every 10 or 20 seconds, etc. How to repair P0646 code Air Conditioning Clutch Relay Circuit Low A/C clutch relay may also be referred to as A/C compressor clutch relay. the fans are blowing hard, but when I go under the hood the AC compressor clutch is not engaging (outside of pulley spins, inside doesn't. occasionally this is enough to make the high pressure transducer see correct pressures and start to May 18, 2013 · The fans do come on. If the A/C clutch engages instantaneously after you manually grounded the wire LB/OR then your relay is GOOD. I have strange Air However, with the switch on, if I ground pin 85 with the relay inserted the clutch will engage. In the last 2 weeks it has gotten to the point where it will work for 10 minutes when the car was cold and then stop. 2 May 2018 hit the “Auto” button and then “off” while I had my finger on the AC Clutch relay. When I tested and first drove the car from east bay to San Diego CA for school, the AC was blowing nice and cold. Please help! :Banghead Aug 26, 2013 · My A/C doesn't need freon and the computer reads code to replace A/C Clutch Relay. I swapped the relay with the blower motor relay (same part) and still the clutch isn't engaging during the auto active test. Not sure how the electrical is set up on it if the power comes through the The AC started cooling of the truck quickly, but stopped blowing cold air about half way through the 20 minute drive. 22 Oct 2015 If the fuse is good, pull the compressor clutch relay and check for power and ground on the relay control coil terminals in the socket. Magnetic clutch control: INSPECT PRESSURE SWITCH OPERATION (a) Connect the positive (+) lead from the ohmmeter to terminal 4 and the negative (-) lead to terminal 1. By using a relay, the high-current electromagnetic compressor clutch can be controlled by a low-current switch. 31 Jul 2010 Find the compressor clutch feed wire, unplug it and connect it to a 12v test light ( or a volt meter) - it should light (or go to +12V) when the a/c is  21 Apr 2009 2. Jump to Latest We just got done changing the T-Stat and took it for a test drive and it went up to the red again. From vcm connector c2 pin 3 dark green/white connector c2 pin 3 dark green/white to ac compressor relay B6 dark green/white wire. You can check the compressor clutch using the auto active test of the IPDM: FIRST lift/stand your wipers up so they won't scratch your dry windshield as they will operate during the test. I wrapped some wire around the relay pins, jumper'd to the appropriate pin sockets, and repeated the test. this process works for testing most anything that runs off a relay like fuel pump  25 Mar 2009 Here's a simply way to test the actual relay mounted in the relay box. Jun 27, 2019 · Solved Location Ac Clutch Relay 05 Nissan Altima 25 Fixya Ac Compressor Clutch Coil Test Where Is The Ac Compressor Relay Located On A Altima Nissan Mar 25, 2020 · An air conditioner clutch that repeatedly engages and disengages is usually an indicator that the vehicle's system is low on refrigerant. for the relay 85 and 86 are the coil (switch) and 87 and 30 are the in and out, to test the compressor clutch you can remove the relay and jump 87 to 30 with a small piece of wire. You can also use a jumper wire to jump the two terminals that pass electrical current onto the air conditioning compressor. While performing the checks, do not leave the relay bypassed The AC compressor clutch is the power feed to your AC compressor. This is most of the time located on the side or top of the compressor and is typically 2, sometimes 3, wire harness. The AC doesn't cycle on, I used a paper clip to shortcut the AC clutch relay, than everything went fine the clutch pulled in and AC cycled on. Insert the pointed end of the test light into  13 Sep 2019 Looking at the graph the compressor clutch has a unique relay, it has a From here, the technician would go out there for pinpoint testing. Based on the vehicle and the specific malfunction this code may be set as many as eight times before the check engine light is illuminated. The FSM states the voltage at the MGC terminal of the module (pin 21, a green wire) should be 10-14 V with the clutch off and < 1. Step 3: With engine running and AC turned on, use test light to check for ground on terminal 1 in relay socket. Applied 12 volts straight to the clutch coil and still nothing happened other than wires getting hot because of a short. Tags: ac clutch relay , ac compressor relay , ac relay , clutch coil relay , compressor relay In that case, the PCM would see that the refrigerant pressures are within bounds and the PCM would provide a ground connection to the control coil side of the AC compressor clutch relay. The electrical contacts in the AC clutch relay can develop pitting that prevent full current flow to the clutch coil, resulting in no clutch engagement. Before you do all that though, just check to make sure the fuses aren't blown and the A/C relay is clicking. So everything after the relay seems to The AC Relays plug into 2 - 4 wire harnesses, located at the front of the underhood fuse box. Upvote (0) VIN Check Car Research Cars for Sale Nov 03, 2018 · How to Test the Main Relay in a Honda . When the A/C amplifier is turned on, a magnetic clutch ON signal is sent from the MGC terminal of the A/C amplifier. The Diagnostic Trouble Code (DTC) when the PCM grounds the Air Conditioning Clutch Relay circuit, excessive current draw is detected on the Air Conditioning Clutch Relay circuit; or, with the Air Conditioning Clutch Relay circuit not grounded by the PCM, voltage is not Dec 25, 2012 · There is no fuse or relay for the compressor clutch. I am now at the AC clutch relay which I could locate in the engine compartment (see attached schematic). I found that the A/C compressor clutch circuit goes 12V à fuse à relay à C104 connector on firewall à compressor clutch connector à ground. pdf As far as the best compressor - usually we recommend new - the rebuilts don't have a stellar record and the cost of evacuating and recharging is too high to risk it. Check again for 12 volts on both wires at the clutch coil when it's plugged  2 Nov 2017 After the coil the relay is the logical place since it is a common fail point and it has the advantage of letting you test both trigger and supply voltage  19 Apr 2017 3G TL Problems & Fixes - How to manually jump compressor clutch - I'm trying to troubleshoot an AC issue - I've replaced the relay and  22 May 2010 Checked Compressor Fuse - ok. any other thoughts on Jun 25, 2012 · Well, looking at the diagram, the A/C compressor clutch relay coil ground path at terminal 86 is provided by the VCM thru pin #1/Connector 3. Inside the block where the relay was located, there should be wires that supply the power to the relay. NOTICE: Inspect the fuses for circuits related to this system before performing the following inspection procedure. Note, after re-reading, your 4K ohm resistance is probably equivalent of "open" as 12 volts / 4K = 3ma, which is not enough to snap the relay closed. 5) Check continuity of Light Blue wire between A/C compressor clutch relay connector and A/C high pressure cut-out switch connector Jan 06, 2016 · The AC clutch cycling switch is a very important component to a modern vehicle’s AC system. If their not clipped on like in the pics, The harnesses are probably laying below the fuse box if there are no relays plugged into them. how to test ac clutch relay

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