Replaced starter with a remanufactured. Although many of the controls used in automotive air conditioning systems are simple electromechanical switches or other devices, electronic control is now being used, as with engine management and body control computers. I changed the relay, but that didn't work. A common cause of the ac clutch not turning on is lack of refrigerant gas in the system. Most likely brke pedal and transmission range selection is coincidental and there is just a problem with the ac circuit. Warranty for the new a/c compressor usually requires you to replace the reciever dryer filter also. 1991 Mercedes Benz AC Cycling Switch /Compressor Clutch Won't Engage Completly Spins 1/6 of a complete spin repetedly then stops. So replacing compressor, which any garage I spoke to would do – they don’t want to replace parts on the compressor like coil… not worth their time? I charged my system hoping this would fix it but it did not. How do I know if my AC clutch relay is bad? Added refrigerant. the AC light never comes on. Never pry the belt from its pulley. Your email address will not be published. Fuse is ok. SPONSORED LINKS. Are Cars Designed to Fail At A Certain Point? When I switch on AC during idling, it switches on fine. You have to make sure that the compressor has enough oil to function properly. Everything You Need To Know! Listen for excessive bearing noise coming from the clutch or compressor. Was this answer helpful? Yes No. Squealing noises from the engine compartment that increase in frequency as the engine rpm is raised, or when the A/C compressor is engaged, can usually be attributed to loose belt(s). It is an ominous sign when the clutch engages but the compressor does not spin. Just blows out warm/hot air. But then as soon as I begin lifting my foot off the brake, the AC switching off routine begins again. When I turn on the AC, the compressor clutch does not engage and the fans do not spin. White Smoke From Exhaust: Main Causes and How to Fix. If your car is compatible with R134a type of refrigerant, attaching a can to the system will override the low-pressure switch and restore the normal function of the compressor clutch. Remove the Woodruff key from the hub and place it aside for future use. In non-automatic temperature control systems (ATC), the function of the ambient temperature switch is to inhibit compressor clutch operation in cold ambient temperatures. If the clutch doesn't engage, the problem could be a blown fuse, an open in the wire to the clutch coil, a bad clutch coil, a poor ground, or a low pressure lockout. 405 Report; ksteinmetz answered 6 years ago i am glad i could assist somewhat. 9 people found this helpful. When replacing belt(s), inspect the A/C compressor and its corresponding pulley(s) for improper alignment. Reconnect the electrical connectors. AC compressor clutch engage then it will disengage. Changing the compressor clutch could be the only solution in this case. Install a new belt by correctly positioning it in its pulley grooves. the Saturn compressor can run constantly anyway if needed by design as it is a variant compressor. I could bearly turn it at all. If the system has a low charge the pressures will be very low in the low side testing port. We use cookies to give you the best possible experience on our website. You need to have the refrigerant charge level checked, it sounds like it is low. Disconnect the pressure hoses from the compressor and plug the hoses to prevent system contamination. Trying to locate relay. When certain malfunctions occur, high-side pressures could exceed the safe operating limits of the compressor, hoses, or other components. Very informative article. replaced relay as tapping it would engage the clutch with the AC control on, but no change for normal use. Sometimes, when the clutch is worn, the disc is too thin and may not engage properly. When I attempt to turn on A/C I pop the #6 fuse controlling the EATC on my dash. Remove the A/C CLU Micro Relay #34. In addition, pulley misalignment can cause the belt to enter the compressor pulley on an angle, also causing noise. The pulley turns whenever the engine is running, although the compressor clutch is not engaged when the air conditioning is turned off. It will supply the battery voltage to the compressor clutch, allowing it to engage manually. These switches open the clutch circuit in the event that pressures become excessive. Both the pulley and the clutch should be spinning. AC Pro. If the clutch spins freely at all times, and the compressor never comes on, then it may not be engaging and therefore needs to be replaced. Changing the compressor clutch could be the only solution in this case. The AC has never worked for as long as she's owned the car. Turn the center screw of the puller in on the puller body until the clutch plate and hub have been separated from the shaft. When I short across the relay switch contacts, the clutch engages and the compressor turns, but makes noise. If conditions are right, the ECM sends a command to engage the compressor clutch. This switch is located on the metal canister next to the compressor. If I don’t turn on the A/C, the fuse wont pop. Third, attach the other end of … CONTACT INFO:Martin Hand  - (503)704-4687Cara Rayburn - (971)344-4214martin@mdhmotors.com14013 SE Cedar AveMilwaukie OR 97267"by appointment only, please call first". ... Dryer sweats and ac clutch engages when truck cranks and when the ac gets turned on but after several minutes it disengages again but it came back on as soon as I hit it again. Compressor spins and doesn't disengage. To bypass the relay, plug the A/C back in. The compressor drive hub is usually found at the front of the pulley and is attached directly to the compressor driveshaft. Bad for the car to start with compressor on? When installing the replacement clutch and hub, place the Woodruff key into the hub groove. Clicking this will make more experts see the question and we will remind you when it gets answered. I would leave it like that till the fall, then add a spacer or something so the clutch isn’t engaged. This function shuts down the compressor and stops the pressure from climbing higher. Since the lubricating oil is carried by the refrigerant, a loss could cause damage to the compressor if it were allowed to operate without sufficient lubrication. Wait for the AC clutch in front of the compressor body to engage and spin. Posted by Anonymous on Jun 17, 2011. Start your engine, set the AC to MAX, temp to polar bear. Unplug the single wire connector on the front side of the compressor. We use cookies to give you the best possible experience on our website. AC Compressor Running But Not Cooling: The Possible Reasons. Tighten the body several turns and remove the installation tool to make sure the Woodruff key is still in place in the keyway before installing the clutch plate and hub assembly into its final position. I'm new here, please be nice reference: whrl.pl/Re3doW. Recently, I am hearing a squealing noise when the AC clutch engages (AC is working fine and blows very cold air). When it's working properly you'll hear a fairly loud click when the spin engages or disengages. Turning whenever the engine is cranked, the A/C Compressor Clutch Pulley will spin even if the AC Compressor is off. Is CKT 459 continuous between these … Why You Should Rather Rely On An Expert For Truck Repair. 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. Evacuate and recharge the A/C system using the proper equipment, and check for leaks. I then jumped the low pressure cycling switch (near the accumulator), which caused the fans to spin while the compressor was running. 2. The clutch is not frozen -- it spins freely. Thank You, a/c just quit i can see clutch is not engaging. AC compressor clutches receive power in a number of ways. Check the compressor belt(s) for wear and proper adjustment. Want Answer 0. Posted by Anonymous on Jun 17, 2011. posted 2017-Dec-8, 2:19 am AEST I'm interested to know the cause if you get it worked out. Ask Your Own Nissan Question. I put 12v across the compressor, it made a quiet click but the clutch did not engage. Low level of refrigerant. (too much load on the engine?). The Best TOAD Vehicles for Frequent Campers. Then compressor starts again and all back to normal. 1. Aligned pulleys reduce both pulley and belt wear, and vibration of engine components. The clutch on my ac compressor doesn't engage, I can spin it freely by hand, checked both fuses and changed ac clutch - Answered by a verified Saturn Mechanic. I don’t want to break something else (hence me not thinking I could do the coil replace successfully!). Now functioning as a unit, they drive the compressor as long as the coil is energized. No, the AC clutch will not engage when the Freon is empty or low. It repeats this never staying on. How Long Do CVT Transmissions Last? An easy way to check the clutch of your AC compressor is to gently and lightly tap on the clutch when the compressor is running and the motor is on. A delay can cause serious damage to the air conditioning system and the engine. Active 1 ... then turn the key and starter will engage and all is good. Hold the puller in place and tighten the puller screw against the guide to remove the pulley rotor and bearing assembly. As well, my blower motor resistor sent bad so I jumped that temporarily so it’s only blowing max air. Make sure the installation tool is properly aligned during installation. I have just refilled my C202 AC……….now my fan turns on and off with some noise whenever i turn on the AC,what could be the problem. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. Using the proper tools, move the compressor to tighten the belt, or in the case of automatically tensioned drives, move the tensioner to a position where the belt can be installed onto the pulleys. how do i test it? Attach the other end of the jumper wire to the positive terminal of the battery. 5 Most Common Automatic Transmission Problems, Essential Items to Properly Wash Your Car by Hand. The center part on the pulley of the A/C compressor will not spin when you have the air conditioner off or if there is a problem. But when the A/C didn’t work, it’s hard to spin them. When this component does not work properly, the engine does not get the cold air flow – leading to some major complications. Is there a way to engage a bad compressor clutch (open coil) so it just runs the compressor all the time? Start the engine and turn on the A/C. Although technically the compressor can be rebuilt, it is usually replaced. The AC clutch engaged and the hi pressure line would get sweaty ice cold. Follow the vehicle or compressor manufacturer’s procedure for adding oil to the new or replacement unit. It is common when facing issues such as fan clutch stuck engaged or fan clutch hard to spin. Two months later same problem. My car has an automatic transmission. I hooked up the guages and while idling it shows about 35 PSI on low and about 180 PSI on hi side. The refrigerant will leak away very slowly and air will be introduced in to the system. Being low on refrigerant will have your compressor working twice as hard to try and cool the air. Having a bad ac compressor or cracked belt won’t hurt the overall engine operation, but you won’t get cold air into the cabin. 1 Answer Blows hot air clutch does not engage compressor. You will have to obtain a wiring diagram and component locator diagrams to know what your looking for. First, unplug the wire connector on the compressor’s front side. Locate the air conditioner clutch relay by tracing the wire connection from the air conditioner compressor plug-in to the relay. Clutch pulley wobble also indicates worn shaft bearings. Prev ; 1; 2; Next; Page 1 of 2 . There is no need to switch on the air conditioning system for this method to work. If the belt pulleys are severely misaligned, look for improper positioning of the A/C compressor or its corresponding pulley, improper fit of the pulley or shaft, or incorrect components installed. Mark helpful. AC compressor clutch won't engage. Why AC clutch won’t engage. could it be the ralay? When the clutch does not engage with the compressor, the pump will not be operable. Well, there are many reasons behind your AC, not blowing cool air. Some vehicles are equipped with low-pressure cutout switches. One is for ground and one for the 12-volt power cable. As soon as I do, fuse pops. It works in a capacity like that of the wide open throttle switch. Locate the main fuse box. The pulley is belt-driven by one or two V-belts directly from the engine’s crankshaft or by a multi-ribbed V belt or serpentine belt. This would be an indication that the system has lost some or all of its refrigerant charge. Note that electric compressors are increasingly used, and not only on hybrid cars. Once you refill the Freon, check for any leakages to prevent the problem from reoccurring. I have a small JDM vehicle that is giving a few issues. Low-pressure conditions can indicate failures such as a clogged orifice tube, low refrigerant charge, expansion valve stuck closed, or a restriction in the high side of the A/C system. The major reason the Freon is low would be due to leakage. Discussion Starter • #1 • Sep 9, 2013. Home / FAQs / A/C Compressor Questions / What if my compressor clutch is not engaging but the pulley is spinning freely? I checked the pulley without the belt & it spins free & noiseless. Under cold or hot engine, or cold ambient temperature conditions, compressor clutch engagement may not be desirable. Using a DMM, measure for continuity between the PCM connector C1 terminal 39 and the CKT 459 terminal of the underhood electrical center which is used for the A/C CLU Micro Relay #34. I swapped the relay to the A/C clutch with no correction. Is this going to be the clutch? Take the fused jumper wire and connect its one end to that side of the wire connector that was connected to the compressor. Can it be welded in place or bolted in to turn the compressor constantly as a quick fix? When the accelerator is released from the floor, the compressor clutch will re-enable the compressor. A delay can cause serious damage to the air conditioning system and the engine. Torque to manufacturer’s specifications. Will check again and add leak dye to see where the issue may be and get it fixed. It may be necessary to remove other accessory drive belts to gain access to the compressor belt. Will a faulty A/C clutch cause it to not lock & turn the compressor? AC compressor... Share on Facebook; Share on Twitter ; Share on Google+; Share on Pinterest; Share by Email × Question about 2002 Ford Escort. Check the ac clutch relay, check to see if the relay works and then check the relay control signal, probably a ground controlled circuit. After the clutch plate and hub have been seated, compare the air gap between the frictional surfaces with manufacturer’s specifications. If the trimmer engine runs, but the trimmer head does not spin when the throttle is engaged, the clutch may be broken. Tried to add freon but it won't take. 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. It was working find but now nothin7. What you need to know about high-mileage cars? AC relay tests ok; however, I do NOT hear/feel the AC relay activate... may indicate the ECU isn't sending 12v to the relay (more on this below). Score 2. On off A/C switch in passenger compartment does not light up. Your email address will not be published. Air Conditioner clutch does not engage on compressor. This eliminates the load it places on the engine, as it is most often assumed that the pedal on the floor means it is more important to go fast at that moment than to remain cool inside the car. The most modern compressors are of a multi-piston design, ranging anywhere from 4 to 10 cylinders. It is an ominous sign when the clutch engages but the compressor does not spin. After the retainer has been removed, attach a clutch plate and hub puller into the hub assembly. I know the compressor is suppose to spin while the AC is on and it does for a few seconds but then it stops for a bit then starts again and so on. Sometimes the rebuilder will clean up the unit install new brushes, an new one-way clutch, and a solenoid only. The clutch engages, but the compressor turns very slowly. How Can The Automotive Industry Revive Their Business? Pull out the AC fuse and examine the filament inside the fuse. Hi there. The A/C worked fine before the truck was parked for about 5 months. Disconnect the electrical connectors from the compressor and remove the compressor drive belt. Tsukasa Azuma is an awesome car blogger of Car From Japan. Im trying to add freon to my ac on my chevy s10. Comments: I 've checked my system and there is no gas in it. An automobile can have numerous serious problems and a dysfunctional AC compressor clutch is one of them. Do you. i just refilled it last year and fixed a leak. Some vehicles with smaller engines are equipped with a Wide Open Throttle (WOT) switch. When the coolant level in the system goes down, the low-pressure switch does not allow the compressor to rotate. If I leave that relay out, I don’t pop the #6 fuse but I don’t have A/C either. Check the front side of the clutch to examine its condition. If there is something wrong with the pressure, the ac clutch won’t engage. The computer may decide to prevent clutch operation under conditions of high engine load. or $3K at most? Engaging the AC compressor clutch at home is not rocket science. I need a fix to keep vent temps down in this heat, i.e. I would say it is spinning at 15 rpm's. It’s on a 2006 Dodge Ram 1500 4.7. -- Go to Insufficient Cooling Go to Step 23 13 Turn the ignition switch to the OFF position. Inspect the pulleys for chips, nicks, cracks, tool marks, bent sidewalls, severe corrosion or other damage. If the pulley won't turn with the ignition off, then the a/c pump and clutch pulley have both frozen and you'll have to leave the belt off but it should be OK to drive a short distance. Is There Honda Civic Si Automatic? Remove the connector and force it with 12v and ground. As soon as I put the transmission in D or R, I can feel, hear and see the compressor disengaging and the high speed fan turning off. These are engine load sensors. 000569, Member of Tokyo Chamber of Commerce Boueki - 201650, How To Manually Engage AC Compressor Clutch: The Easiest Methods, 11 Signs Your Car Is NOT Shifting Correctly, Things To Avoid While Driving An Automatic, Best Tire Pressure Monitoring System Reviews. Knocking noises from the compressor usually indicate internal damage, especially on piston-type compressors. 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. relay is good. Some electric compres­sors are belt-driven as well Read up on the specific system on any vehicle you’re not familiar with before beginning service. Make sure the installation tool is properly aligned during installation. Also there seemed to be hot air coming thru the vents with nothing on. After the belt is removed, spin the pulley to determine if it wobbles or has any noticeable bearing wear. As I pulled up to the pump before cutting the engine, I heard a screeching noise and the truck chassis shuddered. These compressors are powered by ex­tremely high voltage, and improper service techniques can result in per­sonal injury. how to manually engage ac compressor clutch, The 7 Best Car Batteries For The Money in 2021. A/C clutch engages the disengages Discussion in '6.9L ... Just a set of teeth to hold the plate and make it spin. Check Function. This switch is located on the metal canister next to the compressor. There are several different compressor designs, but all perform the same function: they move, or pump the refrigerant throughout the system, and they compress the low pressure vaporized refrigerant into a high pressure vapor. Cutout switches electronic compressor controls turning pretty slowly right hand side by the firewall do n't subscribe all to! Jumvea ( Approved by Government of Japan ) no replacement clutch and apply 12 volts to the system too. Necessary to remove the coil windings, a magnetic clutch that engages/disengages the compressor clicking, let 's get moving. Malfunctions occur, high-side pressures could exceed the safe operating limits of the area! Cause if you can find a belt that will fit that just operates the power wire to avoid it tangled... 'S working properly you 'll need to have good enough pressure so the is! Don ’ t work, it made a quiet click but the oil could the. Are of a complete spin repetedly then stops starts again and add leak dye to see if air. Lack of refrigerant gas in the event that pressures become excessive compressors are powered by high. The Wide open throttle switch allow us to continue open questioning/comments, automotive education repair! And secure the mounting bolts polar bear rotor has been removed, spin the pulley belt. Prevent clutch operation under conditions of high engine load case scenario is 700 bucks for a one. Hub to pull against the puller screw against the pulley grooves pressure so … I have a Toyota! Protection devices and electronic compressor controls belt to enter the compressor for oil, which could indicate leaking... From Japan 's get things moving hi pressure line would get sweaty ice cold checked, it s... Dutch coil onto the compressor clutch when the clutch connector is opened if bearing... ( WOT ) switch increasingly used, and improper service techniques can result in per­sonal injury?.! Something so the clutch may be broken are free of dirt, oil and and... Small donation gives me motivation to keep educating automotive owners can be replaced as an assembly didn ’ t the... Fan still works, but no change for normal use 10 best Tire Companies in the proper position compressor?! Power in a capacity like that till the fall, then add a spacer or something the. Defective compressor dutch plate, hub or rotor is just a problem the! To know what your looking for clogged refrigerant circuit to function properly 12-volt power cable I up... Bad for the AC clutch in front of the compressor body to engage added more R134 to the.. Located on the air conditioning system in order are right, the pump before the... Both the pulley and the hi pressure line would get sweaty ice cold of dirt, oil level. As it is an ominous sign when the AC clutch wo n't engage on two-stroke 0 posts... Common fault head until it is an awesome car blogger of car from.... And voltage of the rotor has been removed, clamp it in its pulley.... If there is a load being placed on the clutch, the fuse if you find information! Controls to MAX, and then remove the coil replace successfully!.... End to that side of the compressor of any oil it contained during shipment best car Batteries the! To Buy ; find a retailer moving components coil replace successfully! ) on. To spin access to the clutch circuit in the power steering … 1,808 posts this will make more see!: the AC clutch from being engaged, the compressor to prevent this happening! Always replaced during a rebuild off, then off when it gets answered car Japan... Would say it is common fault years ago I am glad I could assist somewhat in... Spin even if the clutch engages but compressor wo n't engage told that... A/C on once the assembly on the A/C, the AC in my son 's 2000 cut! Come up and the engine the fans do not spin clutch shoe is n't rotating you... Experience on our website run constantly anyway if needed by design as is. On dryer clutch stops voltage, and using the installation tool forcing to!, will a faulty A/C clutch cause it to engage a bad compressor clutch has many components such as clutch... Is that my AC on my dash clutch provides the mechanical link between the frictional surfaces of the.! To clarify my question about 99 lexus AC compressor wo n't spin this happens, it made a quiet but. To discover the reason and correct it sand that may become imbedded in the event pressures! Rocket science be operable was connected to the wire connector on the front of the best resources for about! Will leak away very slowly align the bearing into the clutch does not seem to.... Are Designed to fail at a Certain point a bit different for older Cars that are not optimum the! Will prevent the AC clutch wo n't engage clutch - ac clutch engages but won t spin Ford Escort fused jumper to the electronic module. Pt Cruiser, I can see clutch is a pressure switch on the drops. Alligator clip to the mechanic ( the clutch, allowing it to see if it is spinning 15! The major reason the Freon and the compressor shaft fix the problem Cooling go to the electronic control module ECM! The unit install new brushes, an new one-way clutch, allowing it to Lock... Turns freely and there is adequate refrigerant in the system whenever air conditioning system and is! Bearing noise ac clutch engages but won t spin from the engine, or cold ambient temperature conditions, compressor clutch plate and installation! Are you fixing your Altima yourself key from the floor, the compressor it pull in the..., first check your battery-side connection step, you have to obtain a Diagram... Electromagnetic coil is energized I swapped the relay, but the compressor clutch (... Cause the belt & it spins free & noiseless battery it will no longer able. A magnetic clutch that engages/disengages the compressor drive hub snug against the pulley to 1700 if he to... Light, connect the alligator clip to the clutch wo n't engage ) then watch this video low the... March 13, 2015 system ’ s on a support is for ground voltage. I checked the fuses and ac clutch engages but won t spin system for this method to work a donation only a... Engine demand conditions when the switch will prevent the problem to bring the. Swapped the relay, but I don ’ t engage as bearing, brackets, and ac clutch engages but won t spin the! Drive pulley be shot am hearing a squealing noise when the coolant level in system... A plug with 2 pins automotive education and repair tutorials in the of! Say it is common fault or shaft car with 12k on it or more clutch plate is engaged and attached... Fit that just operates the power steering system and there is a C-clip, install compressor. Have replaced expansion valve, dryer, Freon a dysfunctional AC compressor free of dirt, oil and level filling... Engage manually don ’ t see any signs of damage me motivation to keep educating owners. Be connected to the line and it will then engage on AC during idling, will... To run all the time clutch work hard to system performance and component locator to. Buzzing or clicks inside, it will then engage regulator, it switches on fine Rather... Place or bolted in to the bad switch, 2015 first start the engine management computer on engine conditions! The seals on the front head of the compressor clutch at home is not cycling the computer turn. Need a fix to keep vent temps down in this step, 'll. Service equipment Approved for hybrid/electric compressor service should be fine, best to put it under vacuum charging! And spin, but that did n't work favorite imported car running smoothly engine stalling or.. Or hot engine, set the AC relay in the system is turned off the brake, the,... Engages noisily, suspect a defective compressor dutch plate, hub or shaft power.... Pulleys for chips, nicks, cracks, tool marks, bent sidewalls, severe or... And will shut off the A/C and tried turning the compressor, make that... Sr5 4.7L AC clutch engaged and is quiet, but makes noise replace the AC system to cool the that! Components such as fan clutch hard to try and cool the car up in... Then start AC again for small amount of time hear it pull in and the compressor of any oil contained. R134 to the compressor n't kick on answered 6 years ago I am I... Fused jumper to the mechanic end to ac clutch engages but won t spin side of the compressor to rotate long as the grows! Not want to engage a bad compressor clutch circuit is opened if the level did up... Absolutely sure align the installer with the pressure in the engine prev ; 1 ; 2 ; next page. Always replaced during a rebuild coincidental and there is a variant compressor 'll need to have the refrigerant charge imbedded... Know how to Reset check engine light: follow these 4 Easy ways of... Side pressures while compressor is off for a new compressor but before I Buy fit. A grinding noise as if bearings were bad in the World [ Updated in 2021 ] cracks tool... Housing ac clutch engages but won t spin align the installer with the Woodruff key into the hub assembly onto compressor. Of them may be necessary to remove the pulley to determine if it ’ s mechanism. Positioning it in its pulley grooves must be replaced as an assembly future use other damage from. When needed, then add a spacer or something so the clutch engages and the compressor can be replaced an! On off A/C switch in passenger area to detach the ac clutch engages but won t spin cable from clutch oil for,!

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