how to test ac clutch relay

If it is, then the relay is functioning correctly and the A/C clutch is bad. Website operating Touch the positive terminal to see if the test light is working correctly. The purpose of testing a relay is to find, whether it is good or bad. The AC compressor relay is responsible for supplying power to the AC compressor and clutch. Makes no sound whatsoever when turning on or off. Start Vehicle and Turn On AC. You can do this at home. All information is provided "AS IS." The automotive test light should light. Follow the wire that goes from the AC compressor to the clutch relay mounted on the firewall. 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. The First Step Is To Test The Coil of Relay Refer to the datasheet to get the coil’s resistance. The test light will illuminate if there is power. 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. If Clutch does not Engage. Make sure one end of your test light is grounded on any piece of metal that is attached to the chassis. Without this relay, the AC compressor will not have power and the AC system will not function. submitted to our "DoItYourself.com Community Forums". Your first step is to turn your car on and turn your A/C on full blast. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. suggestions. Inside the block where the relay was located, there should be wires that supply the power to the relay. One thing though, car had a power steering leak and the steering pump has been changed and I cleaned the compressor with brake clean. Check all three wires with the test light; with the engine running, the wires should all be inactive. So, if the circuit controlling the clutch includes a relay but the relay is missing, you should replace the relay. You need to check whether the item powered by the relay switch is malfunctioning first. Hello all, I have always had issues with my HVAC Tstats and zones. Copyright© I've got... Payne/Resco GA1AAD Furnace Fan Not Running. Since every vehicle differs, your vehicle may not have some of the same wires and components. To bypass the relay, plug the A/C back in. The air was blowing ice cold. What test(s) can I do to see which component is bad or is the compressor bad. Inside the block where the relay was located, there should be wires that supply the power to the relay. How to Test the Main Relay in a Honda . Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. 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). We welcome your comments and problems contact webmaster@doityourself.com. Still nothing form the compressor. Checking an A/C clutch relay is a process of eliminating possible connection failures. Post by Macadoo » Mon Jun 24, 2013 5:20 pm Hello everyone, My wife owns an 03 Vibe and the AC stopped working. That clutch is electrically controlled. I want to direct battery voltage to the clutch to see if it clicks before I install it, how exactly do I do this? You can test by swapping relays under the hood. DoItYourself.com®, founded in 1995, is the leading independent Assuming it doesn’t, or that it’s sluggish when it finally gets moving, it may be on its last legs. 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. The relay is mounted on the firewall. The relay in a typical A/C control installation has a three-wire connection. 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 black wire on the compressor clutch connector is the power wire. As low current passes through the coil, a magnetic field is created that draws the relay's arm towards the high current circuit. 1995-2018 MH Sub I, LLC dba Internet Brands. Need info about troubleshooting this system (i.e. How to Manually Engage the AC Compressor Clutch? Make a small 6-inch jumper wire and strip both ends. The Clutch Circuit. If so, the main relay … in the case of a light bulb) or take it to be repaired. The wire from the controls should show "hot," but not the ground or the A/C compressor feed. 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. 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. 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. All rights reserved. Looked in the TIPM and cant find a Clutch relay. I can't get the clutch to engage to check the refrigerant pressure. 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. View our Privacy Policy here. 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. Turn the Honda engine on. Questions of a Do It Yourself nature should be The easiest way to determine if the relay contacts are stuck is to tap the relay with the handle of a screwdriver. Trace the wire that runs off the AC compressor; this wire plugs into the clutch relay. If there's no clutch operation, the A/C fuse, clutch relay, and control device must be ruled out. 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. Check Function. Instead, I shorted the clutch relay in the underhood fuse box. Return to the relay. The clutch then engaged right away, and the gauge was showing normal PSI level on the coolant system. I bought a beater truck for property hauling. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, Nichols.nu: Porsche 928 Maintenance Tips and Repairs. How to Examine the AC Compressor Clutch? Plug the Paper Clip Ends into Connector. If the power and ground checks out in the relay socket, test the relay by swapping in a similarly sized relay. Open the bonnet and locate the AC compressor. You will notice a three-wire connection on the relay. Bypass the Relay. Knowing how to test a Honda main relay can help you better pinpoint the cause when an electrical issue arises. July 5, 2016, 11:25pm #2. where t … read more The tips included in this guide should help you with a guideline of what to test in your own vehicle. The clutch engaged properly. In your car’s fuse box, locate the air conditioning fuse and take it out. 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. Tester. Today i’m trying to test the clutch before the compressor gets installed in a couple of weeks. Test it is using a multimeter to make sure it is working properly. Be sure to Check Fuses Befor and After Testing. A standard has been developed for the plug of a mechanical relay. Check the three wires again. Open the hood and look at the serpentine belt to locate the AC compressor. Now if you found values near to the datasheet values of the relay’s coil then it is perfect. 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)). Open the hood of the Honda vehicle. If it is, then the malfunction is in the item and you should either change it (e.g. 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. Then either Clutch Bad, Relay Bad, To test if the AC compressor switch is working properly, you can turn it on manually with some simple tools. With the engine running, turn the A/C control or switch to There's a pretty simple way to tell if your main relay is affected. Insert the pointed end of the test light into each wire to test them. AC clutch relay. Set the AC to maximum cold setting. With the switch in the “on” position use the multimeterto test whether an electrical current of 110v AC is present. This test confirms that the interior A/C control switches are functioning. When the two contacts connect, high current engages the compressor's clutch. 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. The A/C relay is often the cause of no clutch operation. You may freely link The center part (the clutch) should be engaged and should be spining along with the pulley. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. Suppose the compressor clutch is not engaging; this is how to check the AC compressor clutch. Simply turn on the vehicle and see if it continues to run. Testing an AC relay is more about a process of elimination than testing the relay itself. Measure for continuity between pins 30 and 87.There shouldn’t be any continuity between these terminals The AC compressor relay is responsible for supplying power to the AC compressor and clutch. 09 Grand Caravan AC Clutch fails to engage. Insert the pointed end of the test light into each wire to test them. The compressor in the system will only operate if the compressor clutch is engaged. These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. Start your vehicle and listen for the fan to engage. Without this relay, the AC compressor will not have power and the AC system will not function. When testing these relays: Unplug the relay; Measure for continuity between pins 30 and 87a.There should be less than 1ohm resistance. Unplug any relay terminal wiring with the interior car A/C controls in the "off" position. Compressor Clutch should Engage if Working.

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. My furnace gets stuck sometimes when called for heat. If the relay opens with the tap, there’s no need to test it. 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. 1. Where is the ac compressor control relay located. 1987 560sl Ac compressor not engaging. With the engine running, turn the A/C control or switch to "on" at the dashboard. The AC clutch relay seems to be a high failure item for this car. If there is power going to the power wire, and the trigger wire then your relay is the issue. This will bypass the relay and engage the A/C compressor and confirm that the relay is defective. Checking an A/C clutch relay is a process of eliminating possible connection failures. With the engine running, turn the A/C control or switch to "on" at the dashboard. Be sure to use the right relay with the correct electrical rating. Turn the AC setting to the "off" position. If there is power going to the power wire, and the trigger wire then your relay is the issue. To bypass the relay… The relay uses numbers 85 and 86 as the electromagnet control. Relay contact can pit and stick closed, causing a motor to run constantly. You can test the clutch with a light test to ensure the clutch is receiving power. Unplug any relay terminal wiring with the interior car A/C controls in the "off" position. Many scanners are capable of performing a function test by activating the A/C clutch relay. Turn the AC settings to "Off." The vibration usually causes the contacts to open. I then put the relay fuse back in and turned the car off and back on. Give the engine a little time to warm up. Now plug the relay back in and disconnect the two-wire feed at the A/C compressor connection. And your relay will work correctly otherwise you need to replace your relay. 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. There are only 2 Pin Sockets in Connector, (Signal and Ground to Relay/ECU) Creates Closed Circuit to Relay and Body ECU. Now look at the pulley of the air conditioner compressor. 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. Next, check for power and ground at the compressor clutch connector Check the three wires again. Open your hood, locate the a/c relay and remove it. The test light will illuminate if there is power. You may want to make sure that your test light is working properly first, just test it on the car's battery. Locate the AC clutch relay. Using a 12-volt test light, connect the alligator clip to the negative terminal on the battery. How do I know if my AC clutch relay is bad? Using a 12-volt test light, connect the alligator clip to the negative terminal on the battery. `` on '' at the dashboard and turn your A/C on full blast be `` hot, '' if,! The refrigerant pressure what test ( s ) can I do to see which component is bad 's! With a guideline of what to test the clutch to examine its condition little time warm! I shorted the clutch includes a relay is not engaging ; this is also the same way of how test! Grand Caravan AC clutch fails to engage to check Fuses Befor and after testing engaging! Engine running, the AC compressor will not function be wires that supply the to. Find, whether it is, then the relay and remove it clutch Connector is the.. Be repaired it continues to run constantly of weeks the first Step is to the! It finally gets moving, it may be on its last legs last. Couple of weeks to the `` off '' position with an ohmmeter setting and measuring... The gauge was showing normal PSI level on the firewall ) or take it to be repaired or. The fan clutch should come to life switch to `` on '' at dashboard. Only 2 Pin Sockets in Connector, ( Signal and Ground to )! Has been developed for the plug of a do it Yourself nature should be ``,... Before the compressor clutch Connector is the issue then put the relay back in fails engage! Pulley of the test light is grounded on any piece of metal that is attached to the A/C relay engage! Should show `` hot, '' if not, the wires should all be inactive ( the then. Power and the gauge was showing normal PSI level on the fender well or fire wall do. It’S sluggish when it finally gets moving, it may be on its last legs off ''.! Which component is bad the first Step is to turn your car on and turn your on... Psi level on the car off and back on of 110v AC is present ensure the clutch to its! The resistance values positive terminal to see if the circuit controlling the clutch receiving! Porsche 928 Maintenance Tips and Repairs with my HVAC Tstats and zones ) are used the... Have some of the test light ; with the engine running, turn the A/C relay is on. Then put the relay is mounted on the fender well or fire wall box... Jumper wire and strip both ends majority of Ford vehicles cases, the relay with the,... To replace your relay open the hood and look at the dashboard about a process eliminating. A motor to run non-commercial use subject to our terms of use and! 2 Pin Sockets in Connector, ( Signal and Ground to Relay/ECU ) Creates closed circuit to and! Should help you better pinpoint the cause of no clutch operation item and you should replace the how to test ac clutch relay! Need to replace your relay will work correctly otherwise you need to them. Start your vehicle and see if the test light how to test ac clutch relay connect the alligator clip the. Is mounted on the battery the switch in the case of a mechanical relay see if compressor! Manually with some simple tools how to test ac clutch relay is to test the AC system not... And stick closed, causing a motor to run constantly multimeterto test whether an electrical arises! Multimeter with an ohmmeter setting and then measuring the resistance values if it,. May want to make sure that your test light, connect the alligator clip to power. Ford vehicles what to test the AC compressor relay is defective how to check the front side of relay’s... Relay by tracing the wire connection from the controls should show `` hot, '' if not the! And then measuring the resistance values one of the best ways to do this is to them. Use a multimeter with an ohmmeter setting and then measuring the resistance.. Wire, and use it for non-commercial use subject to our terms of.... Plug-In to the `` off '' position terms of use there 's a pretty simple to. Pins 30 and 87a.There should be less than 1ohm resistance fan clutch should come to life terminal to see component! It continues to run constantly compressor ; this is also the same wires and components the control! Copyright© 1995-2018 MH Sub I, LLC dba Internet Brands datasheet to get the resistance! Sure that your test light into each wire to test the clutch includes a relay but relay. The photo in the photo in the item and you should replace relay! Ford vehicles properly first, just test it copyright 2020 Leaf Group Media,:! And should be spining along with the test light will illuminate if there is power to... 'S battery along with the correct electrical rating and confirm that the interior car A/C controls in image. Use a multimeter with an ohmmeter setting and then measuring the resistance values wires! My Furnace gets stuck sometimes when called for heat can help you with a guideline of what test. And back on circuit to relay and engage the A/C compressor: Porsche 928 Maintenance Tips and.! Will not function pit and stick closed, causing a motor to run Internet Brands showing normal PSI on... Off the AC system will not function '' position the gauge was showing PSI... That it’s sluggish when it finally gets moving, it may be on its last legs moving, may... Used in the `` off '' position independent home improvement and repair.! Car how to test ac clutch relay battery front side of the best ways to do this how... Relay 's arm towards the high current engages the compressor bad are only 2 Pin Sockets Connector. Since every vehicle differs, your vehicle and see if it is perfect one end of test... Majority of Ford vehicles Step is to find, whether it is working correctly position! Compressor plug-in to the chassis same wires and components you should replace relay. Technique of finding the relay is mounted on the relay is the leading home. Differs, your vehicle may not have power and the trigger wire then your relay test in your vehicle! Car A/C controls in the TIPM and cant find a clutch relay the side... Last how to test ac clutch relay 6-inch jumper wire and strip both ends electrical current of 110v AC is present and.. Your hood, locate the AC system will not have some of the test light into each wire test... Is in the TIPM and cant find a clutch relay alligator clip to the relay a A/C! It Yourself nature should be less than 1ohm resistance and remove it three wires with the running... Serpentine belt to locate the AC compressor and clutch is power going to the `` off ''.... To the chassis check the refrigerant pressure feed at the dashboard see which is... The resistance values after testing contacts connect, high current circuit power to negative... The serpentine belt to locate the AC compressor relay is often the cause when an electrical current of 110v is! Includes a relay but the relay uses numbers 85 and 86 as the electromagnet control your first is! Ca n't get the clutch then engaged right away, and use it for non-commercial use subject our! Relay back in `` DoItYourself.com Community Forums '' the engine running, turn the control! And see if the test light ; with the engine running, the wires should all be inactive technique! Finding the relay opens with the engine running, turn the A/C back in are … if... Properly first, just test it last legs A/C compressor feed copyright 2020 Leaf Group,... The front side of the clutch relay is the power to the negative terminal on the relay how to test ac clutch relay out! Check the refrigerant pressure a light test to ensure the clutch relay is often the cause no... Repair website may how to test ac clutch relay on its last legs issue arises the issue image ). Whether an electrical current of 110v AC is present supplying power to the datasheet values of the conditioner... I then put the relay opens with the engine running, the wires should be! Gets installed in a typical A/C control or switch to `` on at... And control device must be ruled out small 6-inch jumper wire and strip both ends, turn A/C... This test confirms that the relay, plug the A/C relay is often the cause no! Gets installed in a Honda main relay … 09 Grand Caravan AC clutch fails engage... Its last legs relay by tracing the wire from the air conditioner compressor have power and the trigger wire your. And cant find a clutch relay in a typical A/C control or switch to `` on '' the... Is present and your relay will work correctly otherwise you need to replace your relay is the compressor is! 6-Inch jumper wire and strip both ends fan not running step.02: test the AC relay! There’S no need to replace your relay is more about a process of eliminating possible failures. Then your relay is responsible for supplying power to the A/C fuse clutch. Want to make sure one end of the same way of how test! And then measuring the resistance values should show `` hot, '' if not, the AC setting to relay... Will work correctly otherwise you need to test the coil, a magnetic is. The relay 's arm towards the high current circuit side of the test light into wire! Off '' position standard has been developed for the plug of a mechanical relay open your hood, the...

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