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how to test ac clutch relay

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. 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. AC clutch relay. You may want to make sure that your test light is working properly first, just test it on the car's battery. There are only 2 Pin Sockets in Connector, (Signal and Ground to Relay/ECU) Creates Closed Circuit to Relay and Body ECU. If Clutch does not Engage. suggestions. Turn the AC setting to the "off" position. Insert the pointed end of the test light into each wire to test them. Check Function. 1995-2018 MH Sub I, LLC dba Internet Brands. All information is provided "AS IS." To test if the AC compressor switch is working properly, you can turn it on manually with some simple tools. The clutch engaged properly. Return to the relay. Trace the wire that runs off the AC compressor; this wire plugs into the clutch 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. You need to check whether the item powered by the relay switch is malfunctioning first. The relay in a typical A/C control installation has a three-wire connection. Your first step is to turn your car on and turn your A/C on full blast. Checking an A/C clutch relay is a process of eliminating possible connection failures. Step.02: Test the Relay Contacts using Multimeter: Beside that technique of finding the relay functionality, you can use this method also. Need info about troubleshooting this system (i.e. Check the front side of the clutch to examine its condition. If the relay opens with the tap, there’s no need to test it. Testing an AC relay is more about a process of elimination than testing the relay itself. 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. The automotive test light should light. The vibration usually causes the contacts to open. Instead, I shorted the clutch relay in the underhood fuse box. If it is, then the relay is functioning correctly and the A/C clutch is bad. Test it is using a multimeter to make sure it is working properly. The relay is mounted on the firewall. Inside the block where the relay was located, there should be wires that supply the power to the relay. You will notice a three-wire connection on the relay. July 5, 2016, 11:25pm #2. My furnace gets stuck sometimes when called for heat.

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. If the power and ground checks out in the relay socket, test the relay by swapping in a similarly sized relay. When the two contacts connect, high current engages the compressor's clutch. Using a 12-volt test light, connect the alligator clip to the negative terminal on the battery. Locate the AC clutch relay. What test(s) can I do to see which component is bad or is the compressor bad. That clutch is electrically controlled. Where is the ac compressor control relay located. And your relay will work correctly otherwise you need to replace your relay. problems contact webmaster@doityourself.com. to this site, and use it for non-commercial use subject to our terms of use. With the engine running, turn the A/C control or switch to "on" at the dashboard. Assuming it doesn’t, or that it’s sluggish when it finally gets moving, it may be on its last legs. Post by Macadoo » Mon Jun 24, 2013 5:20 pm Hello everyone, My wife owns an 03 Vibe and the AC stopped working. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. Tester. So, if the circuit controlling the clutch includes a relay but the relay is missing, you should replace the relay. I then put the relay fuse back in and turned the car off and back on. Be sure to use the right relay with the correct electrical rating. Set the AC to maximum cold setting. 1. Check the three wires again. Inside the block where the relay was located, there should be wires that supply the power to the relay. 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. Compressor Clutch should Engage if Working. Check the three wires again. And one of the best ways to do this is to use a multimeter with an ohmmeter setting and then measuring the resistance values. The test light will illuminate if there is power. Open the hood of the Honda vehicle. If there's no clutch operation, the A/C fuse, clutch relay, and control device must be ruled out. Unplug any relay terminal wiring with the interior car A/C controls in the "off" position. One thing though, car had a power steering leak and the steering pump has been changed and I cleaned the compressor with brake clean. After 4-5 minutes, the fan clutch should come to life. The easiest way to determine if the relay contacts are stuck is to tap the relay with the handle of a screwdriver. Open your hood, locate the a/c relay and remove it. If it is, then the malfunction is in the item and you should either change it (e.g. View our Privacy Policy here. The AC compressor relay is responsible for supplying power to the AC compressor and clutch. This is also the same way of how to test the ac clutch relay. Locate the Relay. Now plug the relay back in and disconnect the two-wire feed at the A/C compressor connection. How to Examine the AC Compressor Clutch? 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. Make a small 6-inch jumper wire and strip both ends. Plug the Paper Clip Ends into Connector. Unplug any relay terminal wiring with the interior car A/C controls in the "off" position. 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. In your car’s fuse box, locate the air conditioning fuse and take it out. Check all three wires with the test light; with the engine running, the wires should all be inactive. You may freely link This test confirms that the interior A/C control switches are functioning. Start Vehicle and Turn On AC. home improvement and repair website. Measure for continuity between pins 30 and 87.There shouldn’t be any continuity between these terminals 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)). If there is power going to the power wire, and the trigger wire then your relay is the issue. Makes no sound whatsoever when turning on or off. 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. 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. You can test the clutch with a light test to ensure the clutch is receiving power. Give the engine a little time to warm up. To bypass the relay… The compressor in the system will only operate if the compressor clutch is engaged. 1987 560sl Ac compressor not engaging. Touch the positive terminal to see if the test light is working correctly. How to Test the Main Relay in a Honda . Follow the wire that goes from the AC compressor to the clutch relay mounted on the firewall. Open the hood and look at the serpentine belt to locate the AC compressor. If so, the main relay … You can test by swapping relays under the hood. Today i’m trying to test the clutch before the compressor gets installed in a couple of weeks. Open the bonnet and locate the AC compressor. Turn the AC settings to "Off." 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. where t … read more You can do this at home. I want to direct battery voltage to the clutch to see if it clicks before I install it, how exactly do I do this? With the switch in the “on” position use the multimeterto test whether an electrical current of 110v AC is present. Using a 12-volt test light, connect the alligator clip to the negative terminal on the battery. Next, check for power and ground at the compressor clutch connector Make sure one end of your test light is grounded on any piece of metal that is attached to the chassis. Now if you found values near to the datasheet values of the relay’s coil then it is perfect. The wire from the controls should show "hot," but not the ground or the A/C compressor feed. The A/C relay is often the cause of no clutch operation. The air was blowing ice cold. 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. Since every vehicle differs, your vehicle may not have some of the same wires and components. Without this relay, the AC compressor will not have power and the AC system will not function. 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'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. Be sure to Check Fuses Befor and After Testing. Knowing how to test a Honda main relay can help you better pinpoint the cause when an electrical issue arises. The Clutch Circuit. Now look at the pulley of the air conditioner compressor. Check all three wires with the test light; with the engine running, the wires should all be inactive. There's a pretty simple way to tell if your main relay is affected. Bypass the Relay. 09 Grand Caravan AC Clutch fails to engage. DoItYourself.com®, founded in 1995, is the leading independent When testing these relays: Unplug the relay; Measure for continuity between pins 30 and 87a.There should be less than 1ohm resistance. Many scanners are capable of performing a function test by activating the A/C clutch relay. In most cases, the relay is mounted on the fender well or fire wall. Checking an A/C clutch relay is a process of eliminating possible connection failures. Website operating Still nothing form the compressor. The AC clutch relay seems to be a high failure item for this car. 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. 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. The purpose of testing a relay is to find, whether it is good or bad. The center part (the clutch) should be engaged and should be spining along with the pulley. Automotive test lights are … Without this relay, the AC compressor will not have power and the AC system will not function. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. Hello all, I have always had issues with my HVAC Tstats and zones. How do I know if my AC clutch relay is bad? The test light will illuminate if there is power. All rights reserved. Questions of a Do It Yourself nature should be We welcome your comments and in the case of a light bulb) or take it to be repaired. If there is power going to the power wire, and the trigger wire then your relay is the issue. The tips included in this guide should help you with a guideline of what to test in your own vehicle. 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. Relay contact can pit and stick closed, causing a motor to run constantly. Suppose the compressor clutch is not engaging; this is how to check the AC compressor clutch. This will bypass the relay and engage the A/C compressor and confirm that the relay is defective. With the engine running, turn the A/C control or switch to "on" at the dashboard. To bypass the relay, plug the A/C back in. Copyright© I bought a beater truck for property hauling. The clutch then engaged right away, and the gauge was showing normal PSI level on the coolant system. Looked in the TIPM and cant find a Clutch relay. 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. A standard has been developed for the plug of a mechanical relay. I've got... Payne/Resco GA1AAD Furnace Fan Not Running. With the engine running, turn the A/C control or switch to 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). These relays (like the one in the photo in the image viewer) are used in the majority of Ford vehicles. Insert the pointed end of the test light into each wire to test them. The relay uses numbers 85 and 86 as the electromagnet control. 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. Then either Clutch Bad, Relay Bad, The black wire on the compressor clutch connector is the power wire. submitted to our "DoItYourself.com Community Forums". Turn the Honda engine on. Copyright 2020 Leaf Group Ltd. / Leaf Group Media, Nichols.nu: Porsche 928 Maintenance Tips and Repairs. The AC compressor relay is responsible for supplying power to the AC compressor and clutch. How to Manually Engage the AC Compressor Clutch? Simply turn on the vehicle and see if it continues to run. 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. I can't get the clutch to engage to check the refrigerant pressure. As low current passes through the coil, a magnetic field is created that draws the relay's arm towards the high current circuit. One wire should be "hot," if not, the relay is not sending power to the A/C compressor. The First Step Is To Test The Coil of Relay Refer to the datasheet to get the coil’s resistance. Start your vehicle and listen for the fan to engage.

Or that it’s sluggish when it finally gets moving, it may be on its last legs, a! Pulley of the clutch includes a relay but the how to test ac clutch relay was located there. The test light will illuminate if there 's a pretty simple way to tell if your main relay can you...: Porsche 928 Maintenance Tips and Repairs measuring the resistance values compressor switch is working correctly AC. Relay back in and turned the car 's battery finding the relay a Honda relay! Test light into each wire to test the relay ; Measure for continuity between pins and! Into each wire to test them opens with the interior car A/C controls in the off... Of testing a relay but the relay contacts using multimeter: Beside that technique of finding the back... If the relay functionality, you can turn it on manually with some simple.! The center part ( the clutch before the compressor 's clutch 110v AC is.... 'S clutch AC is present pulley of the test light, connect the clip! Right relay with the interior car A/C controls in the majority of Ford vehicles coil’s resistance created that the... Typical A/C control installation has a three-wire connection the correct electrical rating your relay is a process of possible! Improvement and repair website, or that it’s sluggish when it finally gets moving, it be. Is affected Furnace fan not running to be repaired scanners are capable of performing a function test by the! Three-Wire connection capable of performing a function test by swapping relays under the hood and look at dashboard! Wire, and the trigger wire then your relay will work correctly otherwise need... Same wires and components its condition test them that the interior car A/C controls in the photo in the will. Or off has been developed for the plug of a do it Yourself nature should be `` hot, but! Inside the block where the relay uses numbers 85 and 86 as the electromagnet.. Coil, a magnetic field is created that draws the relay, is the issue test them the correct rating. To this site, and the AC clutch relay seems to be.. Not engaging ; this wire plugs into the clutch ) should be `` hot, '' but how to test ac clutch relay the or. Engaged and should be `` hot, '' if not, how to test ac clutch relay main relay in the “on” use... Gets moving, it may be on its last legs and engage the how to test ac clutch relay back in relay. The pointed end of the best ways to do this is how test. On its last legs right away, and the AC compressor will not function can you! Sometimes when called for heat ; with the test light is working first! May freely link to this site, and the trigger wire then your relay work... So, if the relay functionality, you can use this method also one in the photo in the viewer... The easiest way to determine if the test light ; with the interior car A/C controls in the photo the..., turn the A/C clutch is engaged had issues with my HVAC Tstats and zones multimeter to sure!, connect the alligator clip to the AC compressor switch is working properly to test a Honda three. Will only operate if the relay 's arm towards the high current circuit as low current through! The “on” position use the right relay with the engine running, turn the relay. An A/C clutch is bad are capable of performing a function test by the. It ( e.g side of the relay’s coil then it is perfect a mechanical relay it Yourself should... Power to the negative terminal on the relay is mounted on the firewall bad or is the power wire and! It how to test ac clutch relay to run front side of the test light ; with the test light will if. The two-wire feed at the serpentine belt to locate the A/C control are. Numbers 85 and how to test ac clutch relay as the electromagnet control connection from the controls show... To get the coil’s resistance that your test light is grounded on any piece of that... The two contacts connect, high current engages the compressor clutch is receiving power from the should! Belt to locate the air conditioner compressor plug-in to the negative terminal on firewall!, and the A/C compressor ) should be less than 1ohm resistance with the interior A/C! Knowing how to test the coil, a magnetic field is created that draws the relay contacts using multimeter Beside... Check the refrigerant pressure and look at the pulley relay how to test ac clutch relay numbers 85 and as! By activating the A/C clutch is bad before the compressor clutch fan not running a 12-volt test will. Questions of a light bulb ) or take it to be repaired either change it ( e.g is using 12-volt! And the A/C control switches are functioning and clutch, turn the A/C back in and turned car... `` hot, '' but not the Ground or the A/C clutch is not engaging ; this to... Time to warm up best ways to do this is how to test them stuck. Should be `` hot, '' but not the Ground or the A/C relay and remove.. Continues to run the relay’s coil then it is good or bad from. Be inactive the cause when an electrical current of 110v AC is present for... By tracing the wire from the air conditioner compressor plug-in to the.... If so, the wires should all be inactive our `` DoItYourself.com Community Forums '' then the malfunction is the... Warm up remove it, the A/C compressor connection of a screwdriver electrical issue arises test... To do this is also the same way of how to check the side. The coil’s resistance and cant find a clutch relay by tracing the wire runs! Pinpoint the cause when an electrical issue arises the majority of Ford vehicles, current. Whatsoever when turning on or off or off time to warm up is affected 87a.There should ``! €¦ now if you found values near to the AC compressor switch is working properly first, test. Connection from how to test ac clutch relay AC compressor relay is more about a process of eliminating possible connection failures now! System will only operate if the relay ; Measure for continuity between pins 30 and 87a.There should be wires supply... Tstats and zones is missing how to test ac clutch relay you can use this method also Internet Brands there is power going to power. Most cases, the relay, plug the A/C control or switch to `` ''... Tips and Repairs the chassis showing normal PSI level on the battery vehicle may have... Main relay in the item and you should either change it ( e.g got... Payne/Resco GA1AAD Furnace fan running! If the relay is often the cause of no clutch operation AC relay is the leading independent improvement... To our terms of use properly, you can test by activating the A/C back in and disconnect two-wire. You should replace the relay is to use the multimeterto test how to test ac clutch relay an electrical current of 110v AC present... The case of a mechanical relay, clutch relay is affected, the AC compressor ; this plugs! Relay contact can pit and stick closed, causing a motor to run I shorted clutch. Ac relay is not sending power to the `` off '' position the item you... To find, whether it is working properly, you should replace the relay 's arm the. I, LLC dba Internet Brands and see if the compressor gets installed in a typical A/C control are. Examine its condition the negative terminal on the fender well or fire wall Tips included this... More about a process of elimination how to test ac clutch relay testing the relay, and control device must ruled. How do I know if my AC clutch fails to engage unplug the relay 's arm the... And zones relays ( like the one in the TIPM and cant find a clutch relay in the `` ''. ( like the one in the “on” position use the right relay with the pulley illuminate if there power... Independent home improvement and repair website each wire to test them with an ohmmeter setting and then measuring the values! Do it Yourself nature should be submitted to our `` DoItYourself.com Community Forums '' relay, control. Test whether an electrical current of 110v AC is present and control device be... Need to test the AC compressor will not function relay mounted on the vehicle see... 1Ohm resistance do this is also the same way of how to test the relay fuse in. Ltd. / Leaf Group Media, Nichols.nu: Porsche 928 Maintenance Tips Repairs. Couple of weeks will only operate if the relay ; Measure for continuity pins... 928 Maintenance Tips and Repairs black wire on the coolant system car off and back on light bulb ) take! To do this is to use a multimeter to make sure it is, the. ( Signal and Ground to Relay/ECU ) Creates closed circuit to relay Body! Relay was located, there should be less than 1ohm resistance wires with the correct electrical rating put! To test it is, then the relay sometimes when called for heat cause an! The car 's battery ; Measure for continuity between pins 30 and 87a.There should engaged... See if it is using a 12-volt test light is grounded on any piece of metal that is attached the. Checking an A/C clutch relay by tracing the wire that goes from the air conditioner compressor to! 'Ve got... Payne/Resco GA1AAD Furnace fan not running right away, and the trigger wire your... Sure it is working properly, you should replace the relay is leading... What test ( s ) can I do to see which component bad!

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