Ac Clutch Engages Intermittently

It's not that. The extra shim caused a slightly large airgap. Solution: Models fitted with the MTX 75 (Galaxy VXT 75) are known to have problems with the 3rd gear synchroniser ring. Did some suspension work on the car and when finished, took the car out and checked the AC and it was working for 4 days straight. If I pull the fuse when the AC is working and the clutch is engaged will that leave the clutch engaged, or disengage it by doing so. AC kicks in and out as it pleases Clutch engages/disengagesWhen it does start to blow warm air, it seems to re-engage within 5 mins, but there's a strange clunking noise when it kicks back in and there seems to be a strange smell that follows. This system changes the gears of your car with a serious of flywheels, plates (or discs) and bearings. When it doesn't work, the AC Clutch does not engage. Of course, this problem is most common after an air conditioning service when too much Freon has been added. 199000 mi US $490: air conditioning was not working. I have a 1995 Ford Ranger 4 cyl w/ hydraulic clutch, about 95k miles, and an intermittent problem. On the dryer, theres a pressure switch that sends a signal to the relay, and the relay sends a signal to the compressor to engage its clutch and obvious compress the r-134 into a high pressure gas. Buy Volvo S60 S80 V70 XC70 XC90 AC compressor CLUTCH ASSEMBLY 2002 2003 2004 2005 2006 2007: Compressors - Amazon. The clutch actually dissengages and you have to turn off the a/c, wa. Problem: There is what appears to be a crunching noise when changing into 3rd gear. If the pressure is ok then check the ac relay, as they can be intermittent. com FREE DELIVERY possible on eligible purchases. This clip is a safety feature and will re-engage the clutch mechanism in the event that the oper-. Most systems has a high pressure and a low pressure switch that will turn off the compressor. The general cause of the no/intermittent AC operation is the failure of the circuit that engages the AC compressor clutch. The fan works as expected when adjusting the temperature but the air doesnt change temp. Problem may be intermittent. AC compressor won't engage, help Service & Maintenance. If I pull the fuse when the AC is working and the clutch is engaged will that leave the clutch engaged, or disengage it by doing so. Toyota Solara review. How to Replace the Clutch on a Nissan Navara Schaeffler REPXPERT Alistair Mason runs through the replacement of the clutch and dual mass flywheel (DMF) on a Nis in: Technical. Light for AC on off doesn't work. I shut it off to keep from ruining the whole mess. AUTEX is one of the largest AC Compressor & Clutch manufacturer in the auto parts aftermarket. I think so this pully controles this requirement. Auto Group in Riverside, San Bernardino, and Moreno Valley, CA, 92555. Car A/C Stops Cooling or Working After a Few Minutes C can stop intermittently. Everything was OK as well. AC needed a charge. This plug can become damaged over the years and cause intermittent operation of the clutch. your ac compressor clutch may not engage because of a cut off switch that went off if you are not certified in ac. Thanks to marvinstockman for bringing the shim adjustment fix up. It's not that. Re-engage the drum by returning the clutch handle to the engaged position. Recently, the AC compressor clutch will operate for a while, but after 20 min of driving, will fail to engage. I'm currently having issue with my 2004 Sienna AC. Noise - If you hear excessive fan noise or a roar at all engine speeds. AC was blowing cold intermittently, then just stopped blowing cold all together. 6 LX ZETEC SE. I could take this in to Ford to get fixed, but I did that 2 years ago, paid a lot of money, and it still has this intermittent problem which NEVER. I noticed there is a 10 amp Fuse dedicated to the AC Clutch. of the control module and the air conditioning compressor clutch. A/C compressor clutch engages intermittently. My 2007 CRV has been having some issues with its AC. When I start the car up in the AM and turn the AC on it seems to work ok, maybe a little slow to start cooling. Some customers may comment that the A/C system is intermittently inoperative or blows warm air. AC compressor won't engage, help Service & Maintenance. The symptom is intermittent cooling. I have a 1995 Ford Ranger 4 cyl w/ hydraulic clutch, about 95k miles, and an intermittent problem. When a/c is turned on, and car is at idle or in motion, the engine sputters and dies when the a/c clutch engages and rpms are increased. The system is charged with refrigerant (and holding), relay switch is good because I've changed it out, Clutch engages and stays engaged when I "jump" power at the fuse block. Started having problems with the ac on my 2007 Hyundai Azera limited. Turning the vehicle off and on resets the sensor and the AC clutch engages normally again. This diagnostic trouble code (DTC) is a generic OBD-II powertrain code. The compressor clutch just never "clicks" to begin. Product Description. Buying a Toyota Solara. AC compressor clutches receive power in a number of ways. Re: a/c clutch intermittent on f150 2002 supercrew 5. My AC is only blowing warm air. IF, when you turn on the air conditioner (and also, by default, it is supposed to come on if ‘defrost’ is selected), both radiator/condenser fans come on, then I would suspect the clutch/coil assembly has failed. Sometime the Clutch compressor will engage but other time it won't, What could be causing this to happen? The AC is cold when the clutch engages but it's intermittently giving me problems. Improper AC clutch plate spacing or a weak AC clutch coil can also make a grinding or hissing noise when the clutch doesn't engage completely and won't generate enough pressure in the system to keep you cool. I am trying to put refrigerant in my 05 Mountaineer and can't do so because the ac clutch isn't engaging. AMG sells the bearing for 30 or 40 bucks and the bearing /pulley combination was 250. I checked the belt and its fine, the clutch is smooth as butter and the fuse is not blown. It is a bare bones kit because there are other items and add ons you will need, however they are very specific to the Vanagon that you have, what engine you have, etc. The interior is in exceptional condition for its age. Who is correct?. A buzzing noise from the compressor when the air-conditioning clutch is engaged is a sign of an overcharged system. 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. Symptoms:Your air conditioner runs fine for a little while then all of a sudden it blows warm air. 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. Once it's on, it works perfectly. If it is the blower motor, would the compressor clutch engage even if the blower is not working?. Sometimes restarting the car gets it to kick back on, or even letting. Search the world's information, including webpages, images, videos and more. So i pulled it off and its a 3 pin connector, i tried jumping 2 pins at a time until i did all 3 combinations because i didnt know what wire was what but that didnt get the clutch to engage either. It seems to work fine while driving. I believe Dodge uses a pressure cycling switch for the A/C system. 5 from the 14 volts otherwise. Needle nose pliers seamed to work for me. So, i think that the AC system it's self is ok and this is probably an electrical problem. Sometime the Clutch compressor will engage but other time it won't, What could be causing this to happen? The AC is cold when the clutch engages but it's intermittently giving me problems. The compressor clutch just never "clicks" to begin. AC clutch intermittent engage. you are going to check things when it isnt cooling you have a low and high pressure switches that control ac clutch operation the low pressure switch is designed to cut off ac clutch at about 25psi low pressure to prevent system freezing up if this is your promblem you will see the accumlator iceing up. It wouldn't engage which made me think that I'd need a new a/c clutch and maybe compressor. If the clutch plate closes and AC works, you've verifed that clutch gap is too large. Other issues I have had is a build up of sludge on the bottom of the radiator restricting it while at idle. Signs of a Bad or Failing AC Compressor Relay The AC compressor relay is responsible for supplying power to the AC compressor and clutch. One of the more unusual causes of intermittent stalling we've heard about is a defective vehicle speed sensor. Thankful that I could remove the Targa top, I would have melted without AC or an open top. Thanks to marvinstockman for bringing the shim adjustment fix up. going to buy a pressure switch tomm. Hi everyone- Summary- 2006 Corolla, can manually engage ac compressor, but it still doesnt seem to work Details- The air conditioning has been terrible for at least the last couple years. Someone who feathers the clutch engages and disengages the clutch slowly. 2008 Honda CR-V Electrical Problems. the following are the most frequent symptoms and causes of clutch related failures and how they relate to the compressor itself. Troubleshooting a ground controlled clutch that wont engage or stays engaged. I know the mechanic I am taking it to is reputable (and he specializes in a/c repair) -- I made sure of that -- but I also realize my ignorance when it comes to car repairs puts me at a disadvantage. your ac compressor clutch may not engage because of a cut off switch that went off if you are not certified in ac. 09-01 isn't clutch driven and its actually electronically driven so now i have no idea why my AC is working intermittently. Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. I was checking under the hood and noticed the AC clutch isn't kicking in. Two main issues to work out still- one is that the blower intermittently just cuts out. 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. I believe I was able to remove that shim and adjust my AC compressor's clutch air gap. The clutch would overheat and not properly engage. I noticed there is a 10 amp Fuse dedicated to the AC Clutch. Cooling, Heating, Ventilation & A/C - AC Compressor clutch cycles on & off? - My E350's AC was not working (clutch not engaging) so I added two cans (22 oz. The air con worked very very intermittently, so I took it to quikfit for a regas, and they told me it had plenty and the reason the aircon wasnt working was the AC Compr. have you tried applying the voltage when the engine is not running, to see if you can hear a 'click" at all? If there is a click, but it does not engage, the clutch is faulty. If there are more that one, remove the biggest and reinstall. Customer Services Bulletin CORE HEALTH & FITNESS LLC Page 1 of 2 637-4350 Rev: A. 1979 A36, factory air conditioning, with a 2 year old compressor and new hoses. Belt tension is good. When it is cold in the morning it works fine. I have a 2005 Holiday Rambler Navigator with a Roadmaster chassis. This is on my 2004 Forester XS. Also check the gap on the clutch. I need some help. on this setting,the compressor would run all the time. The temperature gauge on the instrument panel works fine. Ensure good earth connection. The compressor clutch should engage. The PCM switches on the A/C compressor by activating the coil inside the pulley to pull the clutch plates together to engage the compressor drive. It wouldn't engage which made me think that I'd need a new a/c clutch and maybe compressor. Thankfully this can be tested (indirectly) by manually locking the fan clutch into its Engaged Mode and I'll show you how in this case study. 5A continuously. The other possibility would be the compressors internal crank/pistons blew up (grenaded) (belt squealing/burning with the A/C clutch engaged). The only way continuing to drive your car with a broken air conditioning system would damage anything would be if the compressor was seized with the clutch engaged. Then if the clutch is not engaged, insert the jumper. Find it in the underhood fusebox, remove it. Acura Legend AC compressor clutch engages intermittently. I am trying to put refrigerant in my 05 Mountaineer and can't do so because the ac clutch isn't engaging. Reconnect the 14-pin connector. Did some suspension work on the car and when finished, took the car out and checked the AC and it was working for 4 days straight. #04-01-38-019A - (Jun 7, 2005) Intermittent Slow to Cool HVAC Performance Concerns in High Ambient Temperatures and/or High Humidity Conditions After Start Up, Especially at Low Engine. 2003 Lincoln Town Car air conditioning compressor won't kick in during the first 15 minutes of engine operation. If your Mustangs Air Conditioning is malfunctioning it could be caused by a faulty A/C compressor clutch coil connector. You can verify if this is the problem by rapping the clutch plate sharply w/ a stick when AC should be running. When the air conditioner is engaged, a squeal will be obvious if the serpentine belt is worn and slipping, if the belt tensioner is malfunctioning or if the clutch bearings in the compressor are going bad. A direct-shift gearbox (German: Direkt), commonly abbreviated to DSG, is an electronically controlled dual-clutch multiple-shaft gearbox in a transaxle design, with automatic clutch operation and with fully automatic or semi-manual gear selection. 2005 Jetta I have been reading in the forum for about 3 weeks and am at about the end of any troubleshooting that I can find. At 70 the tach is at ~4,500 rpm so its well below the red line. AC Clutch/Pulley replacement, belt squealing or burned up? If the A/C compressor pulley bearing has gone south and has partially seized up, this would explain the belt squealing/burning up etc. A/C clutch coil (stator) replacement or clutch rebuild Just changed A/C clutch coil on my 04 Element. My 1998 V70 Turbo's air condtioning engages intermittently. I took it to a local shop and they filled my Freon, which was pretty low and the mechanic hit the clutch with a hammer and it engaged again. Needle nose pliers seamed to work for me. A rattling noise is heard when the engine is running and the air conditioning is off. Recharged ac and now it works fine. Cooling, Heating, Ventilation & A/C - AC Compressor clutch cycles on & off? - My E350's AC was not working (clutch not engaging) so I added two cans (22 oz. It would be lucky if the AC could blow cool air and the compressor could engage. A/C compressor clutch engages intermittently. The best way to trigger this was to let the car idle on a hot day. If it is the blower motor, would the compressor clutch engage even if the blower is not working?. “A leak or a problem with your A/C system could cost as little as $2 for replacing an O-ring to at least $1,000 for something like a compressor failure. To install the coin tray, line up the tabs on the bottom, pivot the tray up to engage its side clips, then turn the dial clockwise. Check the low side pressure which was running about 50 lbs. In the engine bay, right hand side by the firewall. I would make sure the clutch is being commanded to engage before pulling it apart. sounds to me like an intermittent short to ground to the compressor. Also there seemed to be hot air coming thru the vents with nothing on. This isn't actually a Spyder, but an '02 156sw. when AC is turned on (clutch engaged) the noise goes away. But I think this may be not the case. Because of them, driving during rainy days becomes safer because you still maintain your visibility. All pressure levels read fine once the compressor engages. Recently, the AC compressor clutch will operate for a while, but after 20 min of driving, will fail to engage. you are going to check things when it isnt cooling you have a low and high pressure switches that control ac clutch operation the low pressure switch is designed to cut off ac clutch at about 25psi low pressure to prevent system freezing up if this is your promblem you will see the accumlator iceing up. AC clutch only engages intermittently. Runs cold when moving at normal driving speeds, or when running high RPM. Ford Mondeo with MTX75 manual transmission. When it comes to getting a replacement Chrysler PT Cruiser AC Compressor, it's recommended that you got it from a reliable and trusted online retailer like PartsGeek. Why Does an AC Compressor Clutch Engage and Disengage? An air conditioner clutch that repeatedly engages and disengages is usually an indicator that the vehicle's system is low on refrigerant. Cooling, Heating, Ventilation & A/C - AC Compressor clutch cycles on & off? - My E350's AC was not working (clutch not engaging) so I added two cans (22 oz. Took van back twice and they can not figure out what is wrong (not AC specialty shop). Car makers use an electro-magnetic clutch to engage and disengage the air conditioning compressor. Eventually it completely stopped blowing any cold air. Upon reaching the set cabin temperature, the clutch is again disengaged and this cycle goes on till you turn off the AC. My TSM (I finally checked) said the clearance should be. “A leak or a problem with your A/C system could cost as little as $2 for replacing an O-ring to at least $1,000 for something like a compressor failure. Recharged ac and now it works fine. One of things that I've done, and I'm sure this in primitive and unelegant, is to run a 12v wire off the fuse box (proper amps) to the compressor power line to see if the clutch engages, stays engaged and cools. When the air conditioner is engaged, a squeal will be obvious if the serpentine belt is worn and slipping, if the belt tensioner is malfunctioning or if the clutch bearings in the compressor are going bad. Reconnect the 14-pin connector. Conditions for the A/C computer to engage the compressor are: A. My 1998 V70 Turbo's air condtioning engages intermittently. Intermittently the AC will stop blowing cold air. To learn more, see. the compressor pulley may be turning all the time,but there is a clutch inside of the pulley,that engages when the compressor is actually working. If i switch to "a/c off", I can resume ac use in about 2-5 minutes. Thanks to marvinstockman for bringing the shim adjustment fix up. Andre, it would be best to attach a test light to the compressor clutch and see if the power is off when the AC clutch is not engaged. It does start working again after you drive for a while. I checked and I had ~14v to the clutch. it seems to blow warmer quicker if i am idling. But as the clutch wears further down, this time span decreases. The clutch compressor is designed not to engage when something is wrong in the system. If the down arrows continue to flash after selecting a starting gear even after pushing the clutch pedal all the way to the floor and waiting several seconds, it means that the input shaft has not slowed down enough to engage the gear. This means that the magnetic force required to engage the clutch is increased from its design goal. I have seen the air gap get so large that when the compressor is hot, the magnet can not pull in the clutch. You should see zero Volts with the AC off, 12-14 Volts with the AC on. Unplugging then jumping the pressure sensor will turn on the fans and engage the clutch when the car is cool (and the A/C is working). Cooling would come and go while driving and sometimes not cool for a good while. 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. Is there a way to test the fan clutch? I'd hate to throw 400. AC compressor clutch always engaged. "A/C switch is turned on that the clutch does not engage" = Bad Stator, common problem in 2005-2007 models. Magnetic clutch spacer (washer) - if there is a click as per #1 but the AC magnetic clutch does not turn/engage, then this is likely the problem. The most likely cause is intermittent failure of the compressor relay. 4 Post by Schube1255 » Fri Aug 10, 2012 12:49 am 2 days ago my Ac went click and stopped working, the fuse did not blow, I did the same thing, cut the wires and made a jumper to the comp. Checked refrigerant level and that is normal. When it does engage, everything works as it should. For a smoother reinstallation of the clutch it is best to reset the clutch prior to reinstalling into the vehicle. Then if the clutch is not engaged, insert the jumper. The clutch actually dissengages and you have to turn off the a/c, wa. Who is correct?. Always make sure that all other components are in good condition. AC worked great for a few days then became intermittent again. Thankfully this can be tested (indirectly) by manually locking the fan clutch into its Engaged Mode and I'll show you how in this case study. When you press down on the clutch it engages the transmission to switch between gears. Condenser fan seems to be running fine as well. Trust me when I say, there is a huge difference between the two. I have 2011 Mazda CX7. Also is one leg of the circuit being shorted to ground. 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. The fan runs but it is not cold. The clutch is at the end of its life but still engages like the day I bought the car. I believe Dodge uses a pressure cycling switch for the A/C system. What makes the clutch not engage? 39 Answers. It eventually comes back on and quits. I've a 06 Ford Fusion SEL V6 and I have been reading several issues with the A/C system in the fusions 06-07 but I will describe my particular problem, when I turn on my A/C sometimes works fine, sometimes I'll turn on the A/C and the compressor engages but after 5 or 10 secs it disengages and blows only air and then after other 5-10 secs. Not even for a split second. When it heats up during the day it will run for a while and then the compressor kicks off. You can also check the air-gap with a feeler guage and compare that to spec (if you can find the spec). A more refined clutch is thermostatic: a bimetallic spring on the front reacts to the temperature of air at the front of the fan to engage or disengage the clutch. Sometimes it blows cold air and sometimes it doesn't. Don't rely on what others tell you. Try the Yellow Pages in your phone book under, "Air Conditioning, Automotive". History has a way of repeating itself. This will verify that the AC clutch is working. Sometimes restarting the car gets it to kick back on, or even letting. Ford Mondeo upto 1999. The thing is the AC light is on and when I start the engine the compressor clutch engage but after 15 minutes stops and won't come back on until a few hours later after I turn the engine off so I'm lost here and some suggest jumping the low pressure switch but couldn't figure out where it is, hope I can get some help from anyone, I don't want. The refrigerant carries an oil charge that lubricates the compressor. In many of these articles we focused on some of the worst AC problems an old car can have. Note: the car has about 120,000 miles on it. the clutch engages in and out depending how low you have the setting. If compressor clutch is not engaged. When the vehicle stops moving, the PCM may not engage the idle speed motor (carbureted engines) or idle air bypass motor (fuel injected engines) so the engine will idle normally. 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. Its not the clutch relay. A rattling noise is heard when the engine is running and the air conditioning is off. The clutch in this repair was a defective clutch and we were willing to cause damage to the clutch since our plans were to install a new clutch. The starter can spin without engaging with the flywheel, or jam in engagement. Driving around on a hot day in a car without a working air conditioner can be uncomfortable and even dangerous in extreme heat. Not solved. Checked refrigerant level and that is normal. Car: 2006 Honda Civic LX 2 Dr Issue: Intermittent air conditioner cooling Hello folks, My 06 Civic's AC seems to be misbehaving. Buick Check Engine Light Codes. New Coil or Full compressor? I don't think it is as when the clutch was engaged, it blew ice cold! As far as electrical. Next, I ran a hot wire from the battery, directly to the clutch, just to verify that the clutch is really dead. Also check the gap on the clutch. 7L Diesel Dodge Diesels are fitted with an electronic viscous fan clutch, which is electrically activated by the ECU when the engine temperature reaches high temperature or the air conditioning head pressure reaches 240 to 270 lbs. But the moment you start the truck the clutch re engages. If it runs steady when the system is on could be low on charge or a stuck freeze switch, if it runs when the system is turned off it most likely a stuck relay in the pd box. If clutch is not engaging perform diagnosis of the compressor clutch J44 test. The low pressure switch is designed not to allow the clutch to engage when the pressure is less then about 25psi, this is designed to prevent damage to the compressor. When it is cold in the morning it works fine. Do that, get the a/c clutch going, then see what happens. so if the AC compressor comes on then the fan also starts. Thankfully this can be tested (indirectly) by manually locking the fan clutch into its Engaged Mode and I'll show you how in this case study. The specific problem is the failure of a relay inside a small electronic module that is mounted in the engine compartment under the air filter housing. Other factors, such as where the work is done (whether at a local auto repair shop, car dealership or you do-it-yourself) also factors heavily into the cost of repair. The main problem is possibly due to a pressure switch or faulty relay. ok there is no power getting to the compressor. That enters the evaporator which is the heat exchanger feeding cold air in the cab. Noticed your location, Richmond, VA, and had a thoughtwhen the AC's blowing cold, with your humidity there ought to be a least intermittent drips from the condensor drain tube dumping condensed water. And it was. If your actions do not deliver results, you may bring your car to a mechanic and let him do a thorough check-up of your AC system. It was out of spec and the intermittent problem was that sometimes the gap was too far for the electromagnet to pull the clutch in to engage the compressor. My AC is only blowing warm air. If the solenoids remain activated for more than 20 minutes, replace the module with a revised part. If I jumper pins 30 and 87 on the relay, the AC clutch will engage. The refrigerant carries an oil charge that lubricates the compressor. The AC compressor on my 3. The only way continuing to drive your car with a broken air conditioning system would damage anything would be if the compressor was seized with the clutch engaged. (Just goggle it) makes the truck run through a series of test including the ac compressor clutch. Or the clutch isn't working because it doesn't get the signal to engage. Call 1-951-485-4160 for more information. Does the car AC Compressor, works all the time, even when AC is turned off ? Compressor runs with motor with the help of the belt. Observe compressor clutch. The system is charged with refrigerant (and holding), relay switch is good because I've changed it out, Clutch engages and stays engaged when I "jump" power at the fuse block. If the clutch fails to engage with the A/C on, the problem may lie with a blown fuse or a broken wiring. - The clutch feel doesn't seem to be consistent, it was alright for a good hour or so today on the freeway. G Owner's Manual online. The clutch is always disengaged and the compressor pulley rotates freely untill you switch on the AC. Then test to see if the compressor engages. Changed compressor relay. I received a rough estimate on the clutch at $1500. Sometimes it will come on, sometimes it won't. Of course, this problem is most common after an air conditioning service when too much Freon has been added. I can see it sparking when moved through detents. Application Case Industrial Automation BU, Delta Electronics, Inc. I suspect a faulty time delay relay or pressure switch but neither of my Haynes manuals has a wiring diagram depicting a/c schematic relays & switches. They said compressor is shot so I shelled out for a new compressor (this included the compressor clutch also). This was not one of your complaints with the system, but this relay is known for being weak. Get someone to turn the AC on and if you hear a clunk as the AC Clutch engages the disk should start to spin. We're moving to Davis, CA and AC will be required. Also check the gap on the clutch. I'm currently having issue with my 2004 Sienna AC. Check the fusebox first, which is located under the hood near the driver's side fender on 1999 through 2010 Silverado model years and on the left side of the instrument panel on older models (refer to your owner's manual). My ac just stopped blowing cold air one day, once I got home the compressor stopped engaging. Any thing I'm missing or do I need to start looking for a broken wire somewhere?. It's not that. If so, check the electrical wire that goes to the AC Compressor and make sure its not broken. My 2007 CRV has been having some issues with its AC. The temp/fan module was replaced by me (3rd time) about 4 months ago. What can cause the clutch to stop engaging?. If it does engagereplace it or clean it up. Observe compressor clutch. Since it was almost at 100k, I replaced the fan clutch, water pump, hoses, and radiator (small crack). the compressor pulley may be turning all the time,but there is a clutch inside of the pulley,that engages when the compressor is actually working. The relay is located in the fuse box under the hood. They said it will cost $160 to diagnose and up to $1,000 to replace the compressor. I checked the fuses associated with the AC, but they were OK. A failed clutch can be checked using an ohmmeter to check for continuity in the magnet circuit. If the solenoids remain activated for more than 20 minutes, replace the module with a revised part. 4) Run engine at 1000-1500 RPM. This company is not yet accredited. It does it with the hottest Why does my AC clutch always engage? - Diesel Forum - TheDieselStop. This should be replaced with a revised synchronizer ring. you are going to check things when it isnt cooling you have a low and high pressure switches that control ac clutch operation the low pressure switch is designed to cut off ac clutch at about 25psi low pressure to prevent system freezing up if this is your promblem you will see the accumlator iceing up. The fuse and relay for the clutch circuit are good. Sometimes it will after the truck has set for at least several hours or overnight, but most of the time, it will not engage. I was thinking is a light bulb ssue and not related. A/C signal circuit troubleshooting •HVAC DTCs •Blown fuse No. ok there is no power getting to the compressor. What Does Code P0740 Mean? DTC P0745: When the transmission solenoid malfunctions, in most cases the problem is not the electrical part of the solenoid; the problem is generally foreign material obstructing the mechanical function of the solenoid or the flow of the fluid through the transmission valve body. 0 volts, A/C being requested. Once it's engaged the compressor for no reason, it will stay engaged through engine stop / start cycles, and turning the climate system off. Customer Services Bulletin CORE HEALTH & FITNESS LLC Page 1 of 2 637-4350 Rev: A. Note: the car has about 120,000 miles on it. The general cause of the no/intermittent AC operation is the failure of the circuit that engages the AC compressor clutch. At start-up, everything is fine, after 10 or 20 or 30 minutes, it will blow only warm air. Its not the clutch relay.