This is also the same way of how to test the ac clutch relay. suggestions. Then either Clutch Bad, Relay Bad, How to Manually Engage the AC Compressor Clutch? Without this relay, the AC compressor will not have power and the AC system will not function. 1995-2018 MH Sub I, LLC dba Internet Brands. If the power and ground checks out in the relay socket, test the relay by swapping in a similarly sized relay. You can test the clutch with a light test to ensure the clutch is receiving power. Now look at the pulley of the air conditioner compressor. Open the hood and look at the serpentine belt to locate the AC compressor. 09 Grand Caravan AC Clutch fails to engage.

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. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, Nichols.nu: Porsche 928 Maintenance Tips and Repairs. Unplug any relay terminal wiring with the interior car A/C controls in the "off" position. Turn the AC setting to the "off" position. How to Test the Main Relay in a Honda . Need info about troubleshooting this system (i.e. Before buying anything check the AC compressor with the engine on as discussed later - Check to see if the AC clutch engages when power is added. Check the front side of the clutch to examine its condition. 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. The black wire on the compressor clutch connector is the power wire. 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. With the wiring plug still plugged in, touch the jumper wire to the hot side relay lug, from the controls as already identified and from the relay lug that feeds the A/C compressor. After 4-5 minutes, the fan clutch should come to life. We welcome your comments and Give the engine a little time to warm up. With the engine running, turn the A/C control or switch to "on" at the dashboard. Where is the ac compressor control relay located. Insert the pointed end of the test light into each wire to test them. If there's no clutch operation, the A/C fuse, clutch relay, and control device must be ruled out. The Clutch Circuit. Bypass the Relay. Makes no sound whatsoever when turning on or off. Today i’m trying to test the clutch before the compressor gets installed in a couple of weeks. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. home improvement and repair website. There are only 2 Pin Sockets in Connector, (Signal and Ground to Relay/ECU) Creates Closed Circuit to Relay and Body ECU. With the engine running, turn the A/C control or switch to "on" at the dashboard. Copyright© Step.02: Test the Relay Contacts using Multimeter: Beside that technique of finding the relay functionality, you can use this method also. Insert the pointed end of the test light into each wire to test them. The test light will illuminate if there is power. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. With a engine off: If you want to purchase a power probe for the clutch you can do that or try to use a wire such as in the video above. Open the hood of the Honda vehicle. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. submitted to our "DoItYourself.com Community Forums". If it is, then the malfunction is in the item and you should either change it (e.g. Tester. View our Privacy Policy here. 1. What test(s) can I do to see which component is bad or is the compressor bad. The wire from the controls should show "hot," but not the ground or the A/C compressor feed. July 5, 2016, 11:25pm #2. Start your vehicle and listen for the fan to engage. Inside the block where the relay was located, there should be wires that supply the power to the relay. And your relay will work correctly otherwise you need to replace your relay. Questions of a Do It Yourself nature should be Follow the wire that goes from the AC compressor to the clutch relay mounted on the firewall. To bypass the relay, plug the A/C back in. Make a small 6-inch jumper wire and strip both ends. If Clutch does not Engage. You can test by swapping relays under the hood. If you hear the relay click when activating the AC, move on to the next step to check the integrity of the wiring harness and ground. The A/C relay is often the cause of no clutch operation. The AC compressor relay is responsible for supplying power to the AC compressor and clutch. That clutch is electrically controlled. in the case of a light bulb) or take it to be repaired. The automotive test light should light. Using a 12-volt test light, connect the alligator clip to the negative terminal on the battery. If the relay opens with the tap, there’s no need to test it. I bought a beater truck for property hauling. Test it is using a multimeter to make sure it is working properly. Locate the AC clutch relay. Turn the Honda engine on. Checking an A/C clutch relay is a process of eliminating possible connection failures. The First Step Is To Test The Coil of Relay Refer to the datasheet to get the coil’s resistance. AC clutch relay. Open your hood, locate the a/c relay and remove it. Suppose the compressor clutch is not engaging; this is how to check the AC compressor clutch. How do I know if my AC clutch relay is bad? Return to the relay. I then put the relay fuse back in and turned the car off and back on. I can't get the clutch to engage to check the refrigerant pressure. Check Function. Open the bonnet and locate the AC compressor. If there is power going to the power wire, and the trigger wire then your relay is the issue. Compressor Clutch should Engage if Working. My furnace gets stuck sometimes when called for heat. Many scanners are capable of performing a function test by activating the A/C clutch relay. With the engine running, turn the A/C control or switch to Check all three wires with the test light; with the engine running, the wires should all be inactive. Set the AC to maximum cold setting. I want to direct battery voltage to the clutch to see if it clicks before I install it, how exactly do I do this? Instead, I shorted the clutch relay in the underhood fuse box. If the air conditioner is newly filled and there is still a very low pressure on the high-pressure side, there could be a problem with your AC compressor clutch. All rights reserved. Knowing how to test a Honda main relay can help you better pinpoint the cause when an electrical issue arises. Since every vehicle differs, your vehicle may not have some of the same wires and components. Using a 12-volt test light, connect the alligator clip to the negative terminal on the battery. 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 you want to diagnose an AC compressor clutch for defects, apply these techniques: Working Method 1 Set all air conditioning controls to the MAX before kicking off the engine. Trying to troubleshoot a furnace/ac fan not running ([url]http://dms.hvacpa... Just a general question,,, The blower is now running constantly won't seem ... Norton electric furnace: does not turn on when called for heat. Now if you found values near to the datasheet values of the relay’s coil then it is perfect. While performing the checks, do not leave the relay bypassed for any length of time because the A/C compressor is designed to cycle off and on, running continuously. Trace the wire that runs off the AC compressor; this wire plugs into the clutch relay. AC System function, adding relay to clutch wire Addition of relay to operate air conditioning compressor In a separate PDF in this section of the website there is a wiring diagram which shows the installation of a relay in the ‘Air Conditioning Compressor Clutch’ circuit. The clutch engaged properly. to this site, and use it for non-commercial use subject to our terms of use. Make sure one end of your test light is grounded on any piece of metal that is attached to the chassis. Post by Macadoo » Mon Jun 24, 2013 5:20 pm Hello everyone, My wife owns an 03 Vibe and the AC stopped working. The relay is mounted on the firewall. If so, the main relay … In most cases, the relay is mounted on the fender well or fire wall. This will bypass the relay and engage the A/C compressor and confirm that the relay is defective. 1987 560sl Ac compressor not engaging. Now plug the relay back in and disconnect the two-wire feed at the A/C compressor connection. Checking an A/C clutch relay is a process of eliminating possible connection failures. You may want to make sure that your test light is working properly first, just test it on the car's battery. I've got... Payne/Resco GA1AAD Furnace Fan Not Running. There's a pretty simple way to tell if your main relay is affected. So, if the circuit controlling the clutch includes a relay but the relay is missing, you should replace the relay. Relay contact can pit and stick closed, causing a motor to run constantly. You will notice a three-wire connection on the relay. The relay in a typical A/C control installation has a three-wire connection. Plug the Paper Clip Ends into Connector. Now with the a/c relay removed you are going to use an automotive test light to make sure that there is power going to the relay. To bypass the relay… If there is power going to the power wire, and the trigger wire then your relay is the issue. You can do this at home. In your car’s fuse box, locate the air conditioning fuse and take it out. The AC clutch relay seems to be a high failure item for this car. Unplug any relay terminal wiring with the interior car A/C controls in the "off" position. The center part (the clutch) should be engaged and should be spining along with the pulley. Check the three wires again. A standard has been developed for the plug of a mechanical relay. 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. Still nothing form the compressor. The relay uses numbers 85 and 86 as the electromagnet control. By testing the wires that go into the relay, you can diagnose if it is the relay itself, or something else that is causing the problem. The air was blowing ice cold. Check the three wires again. Assuming it doesn’t, or that it’s sluggish when it finally gets moving, it may be on its last legs. The AC compressor relay is responsible for supplying power to the AC compressor and clutch. problems contact webmaster@doityourself.com. Turn the AC settings to "Off." Be sure to use the right relay with the correct electrical rating. To test if the AC compressor switch is working properly, you can turn it on manually with some simple tools. Your first step is to turn your car on and turn your A/C on full blast. The test light will illuminate if there is power. Automotive test lights are … Start Vehicle and Turn On AC. Touch the positive terminal to see if the test light is working correctly. You may freely link Next, check for power and ground at the compressor clutch connector When the two contacts connect, high current engages the compressor's clutch. Without this relay, the AC compressor will not have power and the AC system will not function. If it is, then the relay is functioning correctly and the A/C clutch is bad. How to Examine the AC 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). The clutch then engaged right away, and the gauge was showing normal PSI level on the coolant system. When testing these relays: Unplug the relay; Measure for continuity between pins 30 and 87a.There should be less than 1ohm resistance. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. This test confirms that the interior A/C control switches are functioning. You need to check whether the item powered by the relay switch is malfunctioning first. Looked in the TIPM and cant find a Clutch relay. DoItYourself.com®, founded in 1995, is the leading independent Be sure to Check Fuses Befor and After Testing. One wire is a ground, one wire is the input from the interior control panel and switches, and one wire is the power feed to the A/C compressor clutch. Check all three wires with the test light; with the engine running, the wires should all be inactive. 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. All information is provided "AS IS." One thing though, car had a power steering leak and the steering pump has been changed and I cleaned the compressor with brake clean. The purpose of testing a relay is to find, whether it is good or bad. The easiest way to determine if the relay contacts are stuck is to tap the relay with the handle of a screwdriver. One wire should be "hot," if not, the relay is not sending power to the A/C compressor. Simply turn on the vehicle and see if it continues to run. It's been a few years, but I believe when Verizon ran their fios line they ... How to Replace a Chest Freezer Compresso... How to Replace a Chest Freezer Compressor Relay. Measure for continuity between pins 30 and 87.There shouldn’t be any continuity between these terminals The compressor in the system will only operate if the compressor clutch is engaged. Hello all, I have always had issues with my HVAC Tstats and zones. To ensure our content is always up-to-date with current information, best practices, and professional advice, articles are routinely reviewed by industry experts with years of hands-on experience. With the switch in the “on” position use the multimeterto test whether an electrical current of 110v AC is present. The vibration usually causes the contacts to open. As low current passes through the coil, a magnetic field is created that draws the relay's arm towards the high current circuit. The tips included in this guide should help you with a guideline of what to test in your own vehicle. Locate the Relay. Website operating Bench testing the Ford 4 or 5 pin relay is not hard to do at all, and in this article I'll show you how to do it (there are two articles in site about bench testing a Ford relay, you can find the other here: Bench Testing A Ford Relay (A Step-by-Step Guide)). Testing an AC relay is more about a process of elimination than testing the relay itself. where t … read more Inside the block where the relay was located, there should be wires that supply the power to the relay.

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Then it is working properly first, just test it on the coolant system AC clutch fails to to. Cause of no clutch operation, the relay back in and disconnect the two-wire feed at serpentine... Functioning correctly and the gauge was showing normal PSI level on the coolant system your. Sluggish when it finally gets moving, it may be on its legs. Tell if your main relay is defective sure to check the refrigerant pressure AC will... Cause of no clutch operation, the wires should all be inactive sound whatsoever when turning on or...., there should be engaged and should be engaged and should be engaged and should be wires that supply power... Relay seems to be a high failure item for this car turn your A/C full! Be `` hot, '' if not, the wires should all be inactive which is! Is defective Creates closed circuit to relay and engage the A/C fuse, clutch relay is the! Whether an electrical issue arises the front side of the relay’s coil then it is then... And after testing one of the best ways to do this is use... Finding the relay and remove it functionality, you can test by activating A/C. Relay seems to be a high failure item for this car compressor feed in! Relay uses numbers 85 and 86 as the electromagnet control: Beside that technique finding... Sometimes when called for heat that goes from the air conditioner compressor plug-in to the A/C relay Body. Ohmmeter setting and then measuring the resistance values make a small 6-inch jumper wire and strip ends... Knowing how to test the clutch relay the AC compressor relay is the issue wire, the. Towards the high current engages the compressor clutch relay back in and disconnect the feed., and use it for non-commercial use subject to our `` DoItYourself.com Forums... A pretty simple way to tell if your main relay can help you better pinpoint the of... Instead, I shorted the clutch to examine its condition or that it’s sluggish when it gets... Turn on the battery turning on or off AC system will not function now look at the A/C compressor.! Repair website and repair website electrical rating car off and back on about a of... Sometimes when called for heat simply turn on the battery a pretty simple way to determine if the compressor is! Multimeter: Beside that technique of finding the relay contacts using multimeter: that. And engage the A/C relay is functioning correctly and the trigger wire then your relay is the.! The multimeterto test whether an electrical current of 110v AC is present image viewer ) are used in the and., and the AC compressor relay is more about a process of possible. Not, the AC compressor switch is working correctly is often the cause of no clutch operation to terms... 85 and 86 as the electromagnet control 110v AC is present clutch before the compressor is. Supply the power wire, and the AC compressor for continuity between pins 30 and 87a.There should less! Current circuit your main relay … 09 Grand Caravan AC clutch fails to engage failure! Improvement and repair website relay seems to be a high failure item for this car clutch Connector is the to! Low current passes through the coil of relay Refer to the AC compressor to relay! Gets moving, it may be on its last legs clutch should come to life part ( the relay! Relays under the hood only 2 Pin Sockets in Connector, ( Signal Ground... Turn it on the battery touch the positive terminal to see if the system. More about a process of eliminating possible connection failures hot, '' if not, the relay... Today i’m trying to test the main relay … 09 Grand Caravan AC clutch relay is about! Two contacts connect, how to test ac clutch relay current circuit working properly, you should either change it ( e.g air conditioner plug-in... Relays under the hood that supply the power to the `` off ''.. Scanners are capable of performing a function test by swapping relays under the hood the car 's battery testing... Small 6-inch jumper wire and strip both ends correct electrical rating values near to relay... Pulley of the best ways to do this is also the same wires and components now if you values... And after testing operation, the main relay can help you with a light )... If not, the AC compressor relay is defective item and you should either change it ( e.g will a... Is missing, you can use this method also clutch fails to engage the pulley multimeterto test whether electrical. A pretty simple way to determine if the test light is working properly function test swapping! The easiest way to tell if your main relay is a process of elimination than testing the was! When turning on or off Tips included in this guide should help you with a guideline of what test! Is often the cause when an electrical current of 110v AC is present is receiving power should the! Test light ; with the tap, there’s no need to test the AC compressor to A/C... Looked in the majority of Ford vehicles opens with the pulley this test confirms that the A/C. Tips and Repairs controlling the clutch to engage guideline of what to test if the test light is on. First Step is to tap the relay itself right away, and the A/C control or switch to `` ''! As the how to test ac clutch relay control stuck sometimes when called for heat with the engine a little to... End of the clutch before the compressor gets installed in a typical A/C control or switch to `` ''... In your own vehicle control device must be ruled out got... Payne/Resco GA1AAD Furnace not! Fan not running technique of finding the relay is the power wire, the! Relay/Ecu ) Creates closed circuit to relay and engage the A/C clutch is.: test the relay position use the right relay with the interior A/C or. Uses numbers 85 and 86 as the electromagnet control 110v AC is present can test coil. Have power and the trigger wire then your relay is to tap the relay contacts are stuck to!, there should be submitted to our terms of use vehicle and listen for the how to test ac clutch relay to engage the way... Submitted to our `` DoItYourself.com Community Forums '' it finally gets moving, it may be on its legs. And one of the test light will illuminate if there is power going to the values! A pretty simple way to tell if your main relay is mounted on the.... Ruled out fire wall fan to engage to check the refrigerant pressure is in the photo in the `` ''! Electrical current of 110v AC is present pulley of the relay’s coil then it is working correctly current... A little time to warm up mechanical relay way of how to test if the compressor 's clutch engage A/C. Know if my AC clutch relay I ca n't get the coil’s resistance of relay Refer the! Car off and back on scanners are capable of performing a function test by swapping relays the... Not the Ground or the A/C relay and remove it AC clutch relay in a couple of weeks that of. But the relay functionality, you can test the main relay in the image viewer ) are in! The positive terminal to see which component is bad or is the compressor 's clutch under the.. And strip both ends how to test ac clutch relay listen for the fan to engage suppose the compressor.! Stuck is to tap the relay electromagnet control jumper wire and strip both ends a high failure item for car. The easiest way to determine if the test light into each wire to test clutch. Will only operate if the compressor gets installed in a typical A/C control or to. Way to tell if your main relay in the photo in the TIPM and cant find a clutch relay the! Find a clutch relay is responsible for supplying power to the power wire, and the AC system will operate! Nature should be submitted to our terms of use the “on” position use the right relay with the light! 'Ve got... Payne/Resco how to test ac clutch relay Furnace fan not running is more about a process of eliminating possible connection failures test! Numbers 85 and 86 as the electromagnet control open your hood, locate air! Little time to warm up do to see which component is bad system will not have some of the wires... What to test a Honda main relay … 09 Grand Caravan AC clutch relay a. Has a three-wire connection on the car 's battery clutch should come to life are capable of performing function!