Your AC compressor should spin freely without the AC clutch engaged, for example with the defrost and A/C switches turned off. Mine is stuck engaged all the time. The only way to not spin out is to wait with the shifting until the revs match my target gear. The electo-magnet pulls the clutch against the pulley and causes the condensor to spin. the fan on this car is belt driven, so as long as the car is running, the fan is spinning. There are also a/c compressors called "swash plate compressors" which do not have a clutch and therefore spin all the time; however the angle of the swash plate that the compressor pistons are mounted to can be varied along the axis of rotation. Your AC compressor should spin freely without the AC clutch engaged, for example with the defrost and A/C switches turned off. Since it stays on all the time, I would first try turning off all fans, in the bunk, and on the dash. I've been having the dreaded AC squeal upon start up and it has been affecting my power steering. This one starts out as a noise diagnosis that ends up working in an AC clutch repair on a 1998 Acura 3.2 TL. According to Hayden, here are some signs your fan clutch might need replaced: Fan spins excessively when engine is stopped (three or more times when hot engine is shut off). It is as if shifting would disable the clutch. when i switch it on in the truck the engine idles up like its supposed to but the clutch don't kick in. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. If the compressor is removed from the engine, the belt-pulley should spin freely. Like all components, fan clutches will wear out and need replaced. Do you think i have to replace the compressor? On off A/C switch in passenger compartment does not light up. A bad AC compressor clutch needs immediate fixing. The clutch would work most of the time but sometimes I would have to lift it up from the floor manually with my hand, pump it a few... You need to do a visual inspection of the clutch arm while the pedal is pressed. it's easy enough to change, i just want to understand the logic. It is not always the cause though. @fusebox. Electrical components are not working Inspection, come to your home or office to inspect this for you, The Best Used Cars to Buy If You're a Personal Assistant, The Best Used Cars to Buy If You're a Teacher. coolsurfer800 5 years ago #1. The transmission temperature that you are referring to is normal. Author Topic: AC clutch not disengaging (Read 6801 times) flyingbrick. All the time. I mworking on my blazer AC unit now . If the air conditioning or AC system does not work in your vehicle at all, there is a possibility that some problems have occurred with the compressor. so what goes wrong with a fan clutch that would make the car overheat? Does it spin when running or stay stationary? I think this wore out my brand new throwout bearing in only 4mo/4,000 miles as I understand they are only supposed to spin when the clutch pedal is pushed down. Fans should nor run all the time. Discussion in '4Runners' started by crammit442, Jun 7, 2016. Most professional scan tools can test the engagement, it could very well be a wiring issue. We have to bring it back tomorrow so he can put it on the lift to verify (do you really need to have it on a lift to verify this?). If the clutch engages, then check the power supply to the clutch, including the system protection devices and electronic compressor controls. One is for ground and one for the 12-volt power cable. You can try to switch on the AC … You have a problem with the compressor clutch or the compresser Its likely the clutch its supposed to cycle about 8 times per minute . If you would like help, consider having an expert automotive technician from YourMechanic When pressures reach a certain point the high pressure switch/cycling switch is supposed to cut the feed to the clutch. 3. My bimmer makes the "turbo" noise related to engine speed when it's hot - … If the clutch arm is moving through it's full travel, then your problem... Go under the dashboard by the clutch pedal. The AC compressor clutch often has a plug with 2 pins. Possibly I can fix it myself, or else I will be forced to replace it. The clutch is located in front of the AC compressor. Here is the explanation why it comes on with the AC:" The electric radiator cooling fan assembly is controlled by a thermoswitch located in the side of the radiator. It is an ominous sign when the clutch engages but the compressor does not spin. Hot air started to blow out of the vents. Please see our. And on that one time when you press it and the car still creeps forward, you know you have a problem. I tried a recharge kit but nothing helps. I was wondering if you try to spin your fan/fan clutch by hand is it suppose to make like at least one revolution around? The clutch is supposed to spin the fast when the temp gets high, a broken clutch will either do this all the time or not spin the fan fast enough when it is hot. I tried setting the clutch to only work between 10-90%, no change. 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. I say that because it doesn't engage until you tap of the clutch. guides, Check cars for recalls, common issues & maintenance Post Reply. They do go bad too. I have replaced expansion valve, dryer, Freon. The transmission on this vehicle does run slightly higher than the cooling system temperature. Clutch fails to disengage when pressed. Our certified mechanics come to you ・Backed by 12-month, 12,000-mile guarantee・Fair and transparent pricing. If you look at the center of the pulley, when the a/c is off, the central portion of the pulley should be stationary. This switch is located on the metal canister next to the compressor. Wiggle the fan. You need an AC compressor, as the clutch wont warranty without the whole job, and the increased labor time pretty much makes it more sensible to do the compressor and not just the clutch. The system is designed "FAIL-SAFE". When the two contacts connect, high current engages the compressor's clutch. Check the compressor clutch and make sure that it can rotate freely without resistance. Stand in front of the AC compressor at the front of the engine. No steering wheel shudder, no squeak, squeal or hiss. Is the radiator fan supposed to be on all the time? The front clutch will be hard to spin but if you spin the actual pulley where the belt rides it should spin free. Aka, the engine is already bogged down and the extra amperage from the alternator isn't going to lessen your MPGs by anymore than the clutch that is always engaged. And I haven't gotten a chance to check if it stays engaged with the key on, engine off. I don't even hear the compressor kick on when I turn on the ac or when the car is running. VIN number 1N6ED27T3YC400020. 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. If it does not spin at all, the clutch is broken. If the AC is on, the clutch is always engaged. Put it all back to together and starting adding R134A to the system. With new OEM engine mounts and full engine tuneup the car is smooth as butter in nearly all cases. Hi there. Many people found this news terrible, but in fact, you could often easily repair a compressor. what are the most likely problems. '97 4runner, auto, 4wd, SR5, 3.4L. Most AC clutches are designed to spin freely when disengaged, and also with the pulley and compressor when those are engaged. Or find someone who could perhaps knock the clutch loose for you and leave the wire disconnected. Neal , Dodge … owners, Our mechanics make house calls in over 2,000 cities, Fleet Maintenance with certified mobile mechanics, The statements expressed above are only for informational purposes and should be independently verified. If you want to get... Hi and thanks for contacting YourMechanic. You can test the compressor wheel/clutch by clicking on the AC inside the car and listening to see if that affects the squealing. the clutch won't kick in. If yours is running all the time it only really means one thing: the system is not reaching high enough pressure to shut off. So the culprit is the AC compressor. Forum Master; Posts: 2,994; AC clutch not disengaging « on: Aug 09, 2010, 12:09:28 am » I charged up the AC system in my car yesterday after doing a complete overhaul of the system. High-efficiency AC units incorporate sound-dampening technology and two-stage (variable speed) compressors to keep noise levels below 55 decibels. It also may be that the clutch is too weak to reengage when it's time to run the compressor again. In normal, modern stop-and-go driving, you probably press the clutch pedal in every few seconds. Any ideas? I found my ac clutch off and sitting on the bottom of car. If you would like help, consider having an expert automotive technician from YourMechanic come to your home or office to inspect this for you, and make or suggest any repairs as needed. all the fan blades are in tact. I have a 2002 Altima and while replacing the AC Compressor, we took compressor out of box, drained shipping oil, clutch spun freely at this point. Be sure the car is secure while you are doing this. i just bought another a/c compressor. I have seen that complicated pully to drive the Compressor. If the clutch does not engage, then check the clutch ground connection and coil resistance. i don't really understand what that means. Mine still feels like its constantly cooling though whenever I use the manual climate control … I know on some domestics the front clutch is available, then you have to set the gap between the too, not sure if you can find one for a Subie though. My AC has been inoperable for awhile now; after doing all the troubleshooting suggested in the service manual, I've discovered that the electrical connection to the AC compressor clutch has constant 12V to it even with the car off. If the AC compressor clutch engages when you tap it, try disassembling the compressor clutch and removing all fitted washers, which can extend its life by several thousand miles. The fan supposed to push the air out to the top of the condenser. Any suggestions? 09-25-2012, 09:46 PM. Added proper compressor oil (PAG-46), and clutch spun freely by hand for about one turn and then no longer spun. Im not talking about really hard just a good spin when the engine is off? My questions is, do the compressor and clutch need to replaced at the same time? So it must be working all the time. compressor clutch will not release while ac is on, it does not cycle off - 1999 Cadillac Escalade 2007 Toyota Yaris. If its just at start check the belt tension. Compressor runs with motor with the help of the belt. You can pull out the relay, carefully remove the cover, reinsert the relay, and engage the compressor clutch by manually closing the relay contacts. GM/Ford used to use a cycling clutch orifice tube design as it was supposed to cycle if volume got low but not really as it was operating. Looking at the repair information for your vehicle, it looks like the module bolts to the bottom of the headlamp assembly and... Hello - while it is possible that there are simply loose nuts/bolts for the fan, it is most likely the fan clutch is failing, hence the wobbling fan. Changing the compressor clutch could be the only solution in this case. Try moving the fan forward and backward. I've tried pulling the clutch relay and fuse but the clutch connector still shows +12VDC. When this happens, the engine... Hello! Today, going around with the AC on, i've noticed that the compressor clutch cycles off (i hear it make a click and the typical quiet "groaning" noise made by the CVC compressor on this car, and many others it seems, suddenly stops) whenever i try to move the car by lifting the clutch pedal only. Poor A/C performance at idle or low vehicle speeds. they are all good. Jun 7, 2016 at 10:23 AM #1 #1. crammit442 [OP] New Member. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. As low current passes through the coil, a magnetic field is created that draws the relay's arm towards the high current circuit. to my surprise, the clutch was still there this time, but it wasn't engaging. sounds like a bad thermoswitch. The check engine light is on and the code says coolant temperature is low. Harvey. In this manner, is a clutch fan supposed to spin freely? But that's not how it's supposed to be, I have a clutch for a reason. Sometimes a part fails and the clutch goes from working normally, to not working in an instant. new compressor always equals new receiver/dryer , accumlator unless you want it to fail prematurely. I've replaced the AC idler pulley twice, and it is still there intermittently. The only way to not spin out is to wait with the shifting until the revs match my target gear. The pully where the belt rides spins all the time, then when the a/c compressor needs to be engaged the clutch engages and that is the part at the very front. What will keep this on the there? Most AC clutches are designed to spin freely when disengaged, and also with the pulley and compressor when those are engaged. A system that is low will cycle more frequently or the clutch may not lock up at all. Remove the connector and force it with 12v and ground. While adding the 2nd can the clutch kicked on and stayed on. The AC - compressor runs and stops after maybe 1 - 2 seconds. The front clutch will be hard to spin but if you spin the actual pulley where the belt rides it should spin free. If the pulley does not spin free all the time then your compressor bearing could be wearing out. Wondering if anyone has noticed that also. A delay can cause serious damage to the air conditioning system and the engine. after trying everything else i ran a ground and power wire to the clutch. When the A/C is turned on, the central portion will turn WITH the pulley signifying that the compressor is turning. yours is probably seized since no belt is on it but you will be replacing most of the ac system. I recommend a fan clutch replacement as soon as possible, performed by... Blue smoke coming from your exhaust generally means that the motor is burning the engine oil. Since the compressor is mechanically driven by the engine, the belt driving it is always running. As I'm trying to chase down the last couple of annoyances on the Corolla I'm wondering about the vibration that is introduced every time the AC compressor clutch engages. Look for the AC relay in the fuse box. the clutch isnt supposed to spin unless the ac is on the pulley is supposed to spin freely. SVX8588. technicians, Trusted mechanics, rated by thousands of happy car This leads me to believe that my AC clutch is draging. Depending on indoor and outdoor conditions, this could mean that your system turns on and off every 5 to 10 minutes. A standard has been developed for the plug of a mechanical relay. © Because this is the first time I have EVER driven a car that had AC. Spin the fan. Does the car AC Compressor, works all the time, even when AC is turned off ? I believe if you know how the fan clutch operates it would be easier to understand. The clutch was replaced by a Subie dealer ~22k ago before I bought the car (have receipts) and shifts fine and does not slip at all. Beside above, what temperature does a fan clutch engage? Replace the fuse if the filament has melted or blown apart. That should only happen when you have the defrost on and the car is using the AC compressor to dry the air to defrost it. If the clutch doesn't engage, which is the most likely situation, either you are low on freon, the AC clutch relay is inop, or AC compressor fuse is open (blown). If that works out, you can drive, the only thing left to fail would be the clutch bearing that allows the outer pulley to freewheel with the belt. My air conditioning clutch will not stop spinning and I get no cold air. But now I have AC and I am glad for your help. This reminds me of a similar experience I had last summer. It takes a long time for the engine to heat up. do it right or not at all but it will probably cost half of what your car is worth maybe more Have an assistant turn on the AC controls to maximum. the clutch is engaged when ac is on, it is not froze or stuck if ac is not on, blows cold air, it will not cycle. AC clutch is supposed to disengage after a certain RPM, yes. The AC compressor-clutch doesn't activate unless the signal-wire has voltage applied to it (this happens when the refrigerant is at the correct pressure). Copyright ©1999 - 2019, North American Subaru Impreza Owners Club, Inc. I think so this pully controles this requirement. A defective compressor clutch will damage the compressor, so it should be replaced as soon as possible. This can mean a bad compressor, or a compressor falling out of spec. i checked all the fuses and the relay. Last edited: Sep 25, 2018. The clutch is good, so I know its an electrical issue. Your ac coil will not engage if your 134a is low, so make sure you have enough 134a. So if you hear unusual sounds coming from your air conditioner during normal operation, don't ignore them, as this could be a sign that the unit needs a … I know from a failed clutch on my Range Rover. Listen to the washer's spin action, if it can spin at all. 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. Does it squeak all the time or only when you start it? I hand tighTened it back on. My question is, why is this happening? Step 3. Ironically, I was working on my a/c yesterday since it went out again. Any time the... - 2004-2009 Volkswagen Golf If the fan is running nonstop, it means small electrical part has gone bad and we need to turn the outdoor unit breaker OFF and call Tech. Signs of Worn Fan Clutch. Electronic types might freewheel, but most fan clutches should spin with a little effort. After installing the compressor per instructions, we noticed that the clutch was continually spinning. This can happen for a couple of different reasons such as worn piston rings or leaking valve guide seals. I then just drove arond to see what it feels like to be driving with AC. I added the 3rd can and it did the same. If the clutch isn't locked up then it will spin more free then if it was or is locked up. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. If I disconnect the pressure switch on dryer clutch stops. It supposed to spin whenever the central ac unit is ON. It acts like it is on all the time when you look at it but it is not cooling anything. But I think this may be not the case. Optimize fleet uptime and compliance via mobile vehicle repairs, Partner with us to simplify and scale fleet maintenance, Over 25,000 topics, from beginner tips to technical Below is a common (SPST) single-pole, single-through relay. AC clutch or compressor??? These past few weeks have been brutally cold and I've noticed the cooling fan starts working as soon as I turn on the car. It is an ominous sign when the clutch engages but the compressor does not spin. … What is most likely squealing is called the AC belt tensioner pulley (#73130A from the diagram above). Point 3 happens even though I have the clutch fully depressed! So i bought a used one from a member and his spins freely also...is the ac compressor clutch supposed to spin freely . Then after about 3 - 4 seconds it starts running again. Your vehicle has high intensity discharge (HID) headlamps. Wait for the AC clutch in front of the compressor body to engage and spin. I headed out Friday on 1.5 hour ride … The term short cycling refers to when an AC system’s cooling cycle terminates prematurely only to turn on again after a short time. Just remember, I'm no A/C expert so don't take any of this as absolute gospel. When the first can was near empty the clutch would kick on for about 1 or 2 seconds and go off. If the pulley does not spin free all the time then your compressor bearing could be wearing out. User Info: coolsurfer800. Thank you I hope that for now it will hold the freon and not leak out. Only when the cabin is cool enough to lower the low side pressure would the low pressure cycling switch come into play. So it goes on then off 8 times per munite this is normal . If it does not, shut the engine off and disconnect the negative battery cable with a socket. how to manually engage ac compressor clutch. Without the fans on, the A/C will not … So my wife took her 03 MDX to the shop today and they said it looks like the AC clutch is not engaging. No, the condenser fan NOT supposed to spin all the time. What direction should the fan rotate? If it keeps spinning it's definitely mechanical and you need to replace the compressor. Pull out the AC fuse and examine the filament inside the fuse. A bad AC compressor clutch needs immediate fixing. AC and defrost is off. Locate the main fuse box. Start the engine and let it warm up. Most AC clutches are designed to spin freely when disengaged, and also with the pulley and compressor when those are engaged. On the other hand, the compressor needs to be able to start or stop without stopping the engine. The AC clutch is supposed to be engaged all the time that the mode control is in the AC position and it's hot inside the cabin. no, the a.c. pulley is supposed to turn all the time the clutch only engages when you turn on the a.c or defrost a clutch that isn't shimmed properly will cause it to grab 5.0 Stroker, BBK Long Tubes, BBK Shorty H, Ported heads, custom cams by Voodoo Racing Las Vegas, Magnaflow catback, 4.10's, Lakewood 90/10-50/50, Zoom! Any strong resistance means its locking up. document.write(new Date().getFullYear()) At higher coolant temperatures, the switch closes to start the cooling fans. I have had my car for 5 months. Check the fluid to the transmission, and look at the color of the transmission oil and see if it is red or dark red. If the clutch is engaged all the time then than the car just has to provide power to the compressor to allow the lines to get cold. It's threaded and screwed right back on the ac compressor next to pulley. That depends on the the system. Answer: Most fan clutches engage at about 170°F air temperature (about 180-190°F engine temperature). YourMechanic All rights reserved. AC clutch not disengaging; Print; Pages: [1] 2 All. so my e36 is overheating and one thing i keep hearing is that the fan clutch might be bad. Wait for the AC clutch in front of the compressor body to engage and spin. i put it on and hooked up the wire. A/C clutch engaged all the time. Without the AC belt the car is PERFECT. All b/c the clutch went. I tried to lube it with PB blaster as much as I could, but I still get squeal at least once during a 30 minute trip. When there is voltage on the solenoid, and the solenoid pulls in, the fan shuts off. If your car has a fan clutch, common signs include the vehicle overheating, the cooling fans working very loudly, or engine performance decreasing. Checked all the fuses and relays for the AC, they were good. This is copied from my thread on YotaTech. If If you are a teacher, probably foremost on your mind is getting to school on time. The fan should move freely by hand when the vehicle is off. Clb Another old truck Supporting Member. Not sure if supposed to have a bolt or if will come off again? I took off the clutch and noticed that my bearing is rust colored, slightly orangish. I tried setting the clutch to only work between 10-90%, no change. But that's not how it's supposed to be, I have a clutch for a reason. Point 3 happens even though I have the clutch fully depressed! Changing the compressor clutch could be the only solution in this case. So please tell me - what can i do? The compressor will flatten the pump plate, to just spin without pumping. Joined: Jun 7, 2016 Member: #188969 Messages: 4 Gender: Male Vehicle: '97 4Runner, 3.4, 4wd, SR-5---306,000 miles. Or can it be replaced separately? I have not gotten the time to dig into it; however, I believe the AC compressor is engaged by an electromagnetic clutch (I think all AC units are engaged this way). Hope this helps. I want to know if the clutch moves freely even if the car is off. On any car in the past 20 years this is the case to prevent it from over pressure and damage. 2. im in the middle of a bhg job and noticed my a/c compressor clutch was spinning freely and i thought their was supposed to be some resistance. Look for the switch that the clutch pedal is supposed to push in when you push the clutch pedal down. Made with ♥ in Silicon Valley. A delay can cause serious damage to the air conditioning system and the engine. If it does not, shut the engine off and disconnect the negative battery cable with a … Even when I got my lisence and was using my parents car, their ac was broken at the time. A search of Google images will give you the location of the AC relay. Could have blockage in system slowing compressor, compressor trying to lock up and would neeed to see why the compressor is not trying to spin at same speed as engine, clutch slippage from wrong gap or wrong current to electro-magnet not pulling clutch shoe tight and causing slippage and then heating with the slippage. I went to the store and bought some loc-tite and a nut and went to work pulling of the pan to reattach the clutch. It is as if shifting would disable the clutch. When power is applied the unit engages. Apr 30, 2019 at 9:21 PM #3. You can hardly hear or feel it idle. Would need to know the gauge readings. Hello, thank you for writing in. Share Facebook Twitter ReddIt Linkedin WhatsApp. I have noticed on the foggy mornings that the water is condensing on the outside of the windshield also when the vent is on. Most of the time it should run about 210-220. If the fan doesn’t spin at all, the bearing may be seized. If your ac clutch moves in and out with jumper wires that means that ether your fcm is bad, or you have wiring problem somewhere or your 134a is low. The headlamp control module is used to control the lights. costs, Hand-picked, community-rated professionals, Explore nationwide job opportunities for automotive If the fan spins more than three times, you may have a bad fan clutch. It's just my best guess. The switch is pushed in by the pedal arm rubber bushing that... As As a personal assistant, you have a lot of demands placed on your time.