The only way to troubleshoot a capacitor is by replacing it and testing the unit, so this is commonly done when an AC compressor won’t turn on. I turn my AC unit off but the compressor fan still runs. Hello I have a 2008 toyota camry LE 4cyl that blows warm air when I turn the air conditioning on. If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. In addition to the AC compressor clutch, we also talk about repairing the AC belt idler. Please help, Thanks. My TSM (I finally checked) said the clearance should be. On my F150 5. After about 8 seconds it tapered and was gone. If the compressor clutch engages and turns the compressor, but the A/C still does not blow cold air, the system is probably low on refrigerant and needs to be recharged. If I manually turn on the AC compressor, yes the RPMs increase. This is the wire that is normally connected to the A/C switch on the vehicle, and controls the clutch/pulley assembly. Blocked/Clogged cabin filter. In short, that bearing cannot cause the compressor not to turn. Does the system have to be recharged to make the clutch engage. You will need a set of AC pressure gauges to check the following. The engagement clutch, called an AC clutch, can also fail rendering the compressor inoperative. As soon as the current stops, such as when you turn off your air conditioning, the clutch disengages. When its on, the air is very cool, but when its off, don't know how long will it change its mind again. The AC compressor allows the air conditioner to produce cool air by pumping refrigerant throughout the unit, so when it stops working, the air coming out of the vents is just recycled from outside. This is an otherwise well running 1998 Taurus. How to clean AC evaporator coils with no-rinse spray foam cleaner for routine seasonal maintenance. Then I heard kind of a "wooooooooooooooo" noise. If it was the case where the compressor should not come on, reasons might include: The compressor clutch is shot. If the compressor is off for an extended period of time, you could have a problem with one of the following: 1. With NO FREON in the system but the hoses attached (so I would not spray oil everywhere) the compressor will still not turn over with the clutch engaged. You can get just a compressor clutch kit from almost any auto parts store. have multiple. Re: A/C compressor clutch swap Post by hogdoctor » Mon Jun 03, 2019 2:50 pm there is a low system pressure cutout switch between the relay and the compressor clutch, so if you're getting power through the relay, but not to the compressor clutch, you could be low on refrigerant. Ok, then the clutch itself is slipping. Sanden TRS105-3207 Auto Scroll AC. Compressor clutch slips. One major sign that an AC compressor has gone bad and needs replacement is when the air conditioner is blowing out warm air. My original compressor turns much harder than this one, but it's still seems to not be right. Since the mid-1990s, most cars equipped with air conditioning have also been outfitted with electronic modules that tell your car’s AC compressor to cycle on and off. Take the Puller Kit (5) and Puller Jaws (6) and configure it as shown in the image below. Since you replaced the compressor it is probably not the clutch. The clutch engages, but the compressor turns very slowly. You will usually. However if it's truly failed I guess I'll just replace the compressor complete. -Blow molded case for easy storage and transport. When the AC is off, the compressor clutch does not activate, meaning the AC is not straining the engine. What to Look For: If the refrigerant is low, check for visible system leaks that appear green and oily. Just before winter set in here on Coastal NH, my AC slowly reduced blowing cold until none. This is about a month after I replaced the compressor, I did the replacement myself and felt confident I did it correctly. I have a Ducane heat pump. The best known example of a cone clutch is a synchronizer ring in a manual transmission. The AC compressor continued to turn even after I pulled the 12-volt supply wire to the unit. Although it may be alarming the first time it happens at a stoplight or when you are idling at the store, it is very normal. However, a/c clutch was not engaging. Car makers use an electro-magnetic clutch to. The radiator fans should be running on low speed whenever the AC is on so I believe the AC looks for the fans and thens shuts off when they do not run. Call 866-213-2952 to test drive Stock #TA200308A. Manufacturers do their best to mask both of these symptoms of a properly operating air-conditioning system. When car is started and all ac is off, the ac clutch kicks on after a second or 2. Troubleshooting: Followed SM's "Compressor Clutch Circuit Troubleshooting" steps. So that the compressor is not always turning, there is a magnetically operated clutch between the pulley and the compressor. Checking for a broken compressor involves using ultraviolet dye and a black light, and some simple observational skills. A failed electronic clutch on a vehicle's AC compressor can lead to the freeze up of the AC pulley which, in turn, destroys the belt. Buy online and get free next day delivery or pick up your parts in an AutoZone near you today. After a while it starts to engage for few seconds and than back off for about 10-15. In any auto air conditioning system, there are several key parts. Your clutch should operate. compressor inlet line and turn the compressor by hand to see if you feel it sucking in the. The fix is to remove the clutch plate from the compressor, and remove enough of the shims in it to get the air gap back to ~0. At this point he needs to verify the AC clutch coil is getting 12V when the AC is on. You wouldn't want to replace the clutch, only to have the compressor itself fail catastrophically a few weeks later, shooting metal debris into the system. Get automotive switches, AC compressors, AC clutches, filters and more! Buy online, pick up in-store in 30 minutes. 2005 Yukon XL Denali 215k 6. All things considered and if the unit is truely still good, why does the clutch NOT engage when I turn the AC on? The plug into the clutch appears in good condition. Ok, then the clutch itself is slipping. If the clutch fails, you will start to hear a squealing noise. No more cold air! The ac compressor clutch is not kicking in. A drive belt connected to a crankshaft pulley turns the AC compressor pulley, which is mounted on the end of the compressor. Harrison R4 AC Compressor Repair Tutorial. Me, like others on the board am having problems with their AC. Hello I have a 2008 toyota camry LE 4cyl that blows warm air when I turn the air conditioning on. Adjust all the controls of the AC to MAX and then start off the engine. It has one wire going into the back top of the compressor and another wire into the top. If you have a question about your Volvo's air conditioning, please become an MVS member (free!) and post it to the correct area of the Volvo Forum. This one starts out as a noise diagnosis that ends up working in an AC clutch repair on a 1998 Acura 3. The noise is very apparent from outside the vehicle. Are there any other tests that can be done? I've read many posts and see that some owners have replaced the clutch and some replaced bearings too. A/C compressor seems to turn off at idle I'd check the fan clutch for proper operation for starters I took the serpentine belt off to put the ac compressor. 0 liter, standard transmission So yea on really hot days my AC compressor cycles on and off continously. As soon as the current stops, such as when you turn off your air conditioning, the clutch disengages. r134 converted, full of freon. The clutch bearing should be able to be spun a little. Improved parts are available. The low pressure cycling clutch switch contacts are. YourMechanic. If the new compressor comes without a clutch, you can remount the old one. Then I heard kind of a "wooooooooooooooo" noise. Compressor clutch slips. The blower fan seems to kick off as well, though it's not putting out very much air. The compressor should run in the A/C mode, the defrost mode, or the Defrost/floor (mix) mode. I was watching the ac compressor clutch engage/disengage today after replacing my water pump, and I noticed it starts and runs smooth for a few seconds, but then stops, and after about 30 seconds it starts again, runs for 10-15 seconds and stops. The fix is to remove the clutch plate from the compressor, and remove enough of the shims in it to get the air gap back to ~0. Both fans should still in high run in fast speed if the ignition is on and a high coolant temperature exists (i. Faulty compressor clutches could be the result of an overcharged system. Vehicle Level Heating and Air Conditioning Compressor HVAC Compressor Clutch Service and Repair Service and Repair Notes DENSO A/C COMPRESSOR REMOVAL NOTE: The compressor clutch assembly can be serviced with the refrigerant system fully-charged. Most non ac setups have different idler puppies so just a non ac belt will probably not work Snap a picture of the side and end of shaft sticking out of the ac compressor where the pulley/clutch fell off so we can see if it was damaged or has a broken off bolt. 2nd Gen Dakota Tech - Air Conditioner Compressor Clutch NOT Engaging - First off, I'd like to say I partially know what Im talking about so this may be slightly interesting for experts. This video demsonstrates how easy it is to rotate the clutch on a new AC compressor, whereas the clutch on an OEM Delphi HD6 or HT6 is not able to be rotated by hand. No power at compressor. Your issue sounds like the compressor has failed (bearing, debris in the pump, etc. Discussion in 'E36/7 Z3 your AC compressor clutch is probably on its last legs. THAT's what turns the compressor off. Let run for ~5 mins. i took a screwdriver and spun the clutch on the pulley just to make. If it is really hard to to turn then the compressor or some other aspect of the AC may be defective. I noticed as I was recharging it that it got to the correct pressure extremely quickly, like the compressor was not engaged. The pulley bearing slips over a sleeve outside the shaft, so the pulley moves freely. Can someone please help me locate the air conditioning compressor & clutch? 8 Answers. The only way to troubleshoot a capacitor is by replacing it and testing the unit, so this is commonly done when an AC compressor won’t turn on. It would not disengage. ac compressor You mean the clutch is frozen until you turn on the ac? Then the clutch both (1) becomes moveable and (2) engages the pulley and turns? I would think the clutch should turn along with the pump since these two appear to be connected by a shaft. Does the system have to be recharged to make the clutch engage. 4 and turn ON the ac, the car ac doing perfect chill cooling but turn OFF after 30 mins and didn't turn ON unless i pressed clutch and rpm goes to 1K and the compressor again starts. Chevy TrailBlazer AC compressor problems. The clutch engages and starts spinning. Is there something in the compressor that can be fixed, or do I just need a whole new compressor?. The AC compressor continued to turn even after I pulled the 12-volt supply wire to the unit. Since the Shaft of the AC Compressor is mated with the A/C Hub, once engaged, it begins to pump refrigerant in the system. OP, if the leak is of the slow variety, given the age of the car it might be worth it to buy an inexpensive kit and add a little Freon from time to time. Also, when clutch was jumped/engaged, I measured temps at vents and temps dropped from 90 to 70 degrees. The clutch does not engage. Had it for almost 2 years. From vcm connector c2 pin 3 dark green/white connector c2 pin 3 dark green/white to ac compressor relay B6 dark green/white wire. 80-- B e a rin g Stake Lo c a tion s CLUTCH ROTOR BEARING REPLACEMENT Removal 1. There is a relay that turns on the AC clutch. Few days later started to hear terrible grinding noise coming from my compressor. After finding that surprise, I figured a more thorough eval was in check. Popping the hood with maximum air-conditioning selected often reveals the problem of the car AC clutch not engaging. Failing internal components caused by normal wear or low AC Oil levels caused by leaks. If the A/C clutch relay is stuck or the switch is faulty then the clutch will stay engaged. I had a shop hook up the low and high port and tell me the pressure is fine but the compressor is not compressing. If the new compressor comes without a clutch, you can remount the old one. Then I heard kind of a "wooooooooooooooo" noise. Here is where it slams into a wall, Compressor clutch will not pull in when air condition is selected at climate control panel. What is an AC clutch compressor. ac clutch will not start. If a clutch gets too hot from a Compressor problem then it will cause the rubber on the hub, the bearing, and the coil to come undone. When current is passed through, it creates a strong magnetic field that pulls a splined hub into contact with the spinning pulley. So that the compressor is not always turning, there is a magnetically operated clutch between the pulley and the compressor. Automobile air conditioning electrical problems aren’t as common as AC Freon slow leak issues, but I have seen them enough to warrant a page about it. Since you've checked AC relay and fuse, check to confirm 12V is arriving at compressor clutch connector. After buying new belts I realized the belt didn't just break because it was old, the air conditioning compressor pulley won't spin at all when I try to spin it with my hand, making me believe that the belt was being dragged around a pulley that wouldn't spin, forcing it to snap. Refrigerant Checks. I let it run on MAX for about 5 minutes then hooked a monitor to the low pressu. You wouldn’t want to replace the clutch, only to have the compressor itself fail catastrophically a few weeks later, shooting metal debris into the system. The engagement clutch, called an AC clutch, can also fail rendering the compressor inoperative. 5 years, its been great. Can someone please help me locate the air conditioning compressor & clutch? 8 Answers. Replacing the compressor will fix this. You can test this with system on (should work with engine off and key in run with A/C on) or with engine on but be careful and tap the head of the clutch - if it clicks in that's your trouble and most are simple to fix. And the compressor is getting 12V. if the fuse blows,look for chaffed wires in the harness. 2006-2012 Honda Civic AC Compressor Problems As the weather heats up this summer, you'll need to make sure that the air conditioning system in your Honda Civic is in proper working order for maximum comfort while commuting or on a road trip. AC service and repairs for all Cars. Symptoms of a Bad or Failing AC Clutch Cycling Switch. This could be caused by a bad ac clutch relay, wiring between the relay or the ground to the clutch coil. An air conditioning compressor is designed to move "gas" and not liquids or solids. Problem persists even if I disconnect the AC and jump the compressor right to battery. Also the mechanical clunk from the compressor wasn't happening. My '88 Turbo S has a great AC system: complete gone-through within 5 years, blows very cold, though the compressor cycles on/off every 10-15 seconds or so continuously: regardless of temperature, time, speed, etc. When running in AC Mode, the outdoor fan and compressor kick off just fine. Checking to see if the compressor clutch is engaging is a simple visual inspection. compressor drive shaft. The compressor clutch solenoid is shot. Since I have not had this car from new I don't know if this is normal. A/C Compressor Clutch: The A/C Compressor Clutch is used to engage or disengage the compressor when you press the A/C button on the dashboard. I noticed as I was recharging it that it got to the correct pressure extremely quickly, like the compressor was not engaged. When I jumped the power circuit on the condenser fan, I just heard a click coming from somewhere around the compressor. Oh yes, my best friend is a Haynes air conditioning manual. The Los Angeles Rams will take on the Cincinnati Bengals in Week 8 in London with the Bengals searching for their first win of the season. air conditioining compressor The most common symptom of a compressor failure (besides no cooling) is a seized compressor. In any auto air conditioning system, there are several key parts. Few days later started to hear terrible grinding noise coming from my compressor. When I turn on the AC from the HVAC control, the PCM responds by bumping up the idle speed slightly as if the compressor were to engage, so I know it is receiving the call for AC from the BCM. if the fuse doesnt blow,grab the front of the compressor and see if it spins with moderate resistance. Discussion in 'E36/7 Z3 your AC compressor clutch is probably on its last legs. If the clutch engages but the compressor does not turn, it means that you probably need a new one. but usually replacing the entire compressor turns out to be the most efficient repair. Manually switching the a/c on and off would sometimes get it to work, but not for long. (Skip to step 10) There is an electrical problem in the air conditioning circuit. Search for blockage in air ducts and outputs, remove any blockages found Clogged Cabin Pre-cleaner. I believe you just turn on the system set to cold. I think that there must be a reason why the clutch would come apart without a heavy load on it. How likely is it that the AC compressor clutch only fails? I was driving home yesterday slowly, AC was blowing cold. My original compressor turns much harder than this one, but it's still seems to not be right. Some time ago I asked a mechanic to look at it while doing some other work, and it wasn't fixed. In simple terms, an A/C Compressor is a pump. My AC clutch occasionally will not fully engage. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. Turn your car on and turn the AC on then pop the hood and. I can turn the compressor by hand with not too much torque; the resistance is consistent and it turns 'kinda' smooth. Product Type: -Exhaust Shuttes. After checking things out, I found that the ac runs constantly & the ac clutch won't cycle off - even when turning all ac controls to "off". THAT's what turns the compressor off. causing the PCM to turn the compressor clutch on and off. Is it possible for the ac compressor to seize up and not allow the belt to turn. A4 Air Conditioning Control Circuit Troubleshooting. The shaft does not appear to be bent. That is what I meant the first time. The air blows warm right now and the vent actually runs cooler. The moment it hits 20psi the clutch shuts off. Faulty Compressor Clutch. Yes the compressor pulley should spin at all times. Now how do I tell if this is the clutch or the compressor that is the problem ?. Examining Air Conditioning Clutch Failures in the Field This guide can be used as a reference to diagnose clutch failures, and is specifically designed to help you differentiate between unwarrantable clutch failures and those that would normally fall under possible warranty consideration. Jump to Latest Follow. My ac compressor went out and so I bought a new drier ( i know you should replace expansion valve also) and went to the junkyard and got a ac compressor. An refrigerant over charge puts a tremendous strain on the compressor clutch causing it to work twice as hard as it should which can burn it out. Air conditioner clutch turns on and off every 5 seconds (Ford Explorer Sport 1998) so my AC works, however It isn't super cold air. If it's ok, replace it anyhow and check the air conditioner relay by having a friend turn the a. Pictured to the right are the three main components of a serpentine belt driven electronic compressor clutch assembly. Some of the vehicles that belong to these product lines are the Nissan. Electronic Blend Door Actuator is not functioning which would only allow warm air to pass through vents. The compressor is usually located towards the front of your engine, just inside the grill of your car. Why does my AC compressor cycle on and off is a common question that every AC contractor hears repeatedly. my ac system blows hot air so i thought the pressure was low, and got a can of r-134a and added it. AC compressor clutch is not engaging. When I turn the AC on (GM A6 compressor) the alternator "quits charging". The air conditioning cut in and out intermittently. If you have a situation where your car’s air conditioner compressor clutch doesn’t engage, try the troubleshooting techniques described here. I was able to tap it with a rod today and it started again. Refrigerant Checks. my ac system blows hot air so i thought the pressure was low, and got a can of r-134a and added it. Let the system cycle and repeat until the low side pumps down to what about 30 something psi and cuts off and will come on by itself. These include: Low level of coolant. Didn't seem like it was grinding or anything, just difficult to turn. AC is not working. Your issue sounds like the compressor has failed (bearing, debris in the pump, etc. look all new also. Kubota Ac Compressor found in: A/C Compressor, with Kubota Number 3P999-00620, This brand new AC Compressor is designed and manufactured to replace the original Denso SCSA06C compressor from your vehicle. Without the cycling switch to activate the compressor’s clutch, the AC system will not be pressurized correctly, and the system will be. I set the ac blower to maximum i. I pulled the AC relay from the main fusebox under the bonnet and swapped it with a similar one from my fog lights. Failing internal components caused by normal wear or low AC Oil levels caused by leaks. The swash plat is controlled by a solenoid. There is a relay that turns on the AC clutch. The compressor clutch kicks on and off randomly during the driving. How likely is it that the AC compressor clutch only fails? I was driving home yesterday slowly, AC was blowing cold. When I spin the clutch plate (not the ribbed pulley) I can feel the compression of the AC compressor (which is normal) but there's also an intermittent noise that sounds like shaking pebbles in a tiny glass jar every few turns, as it turns. When I turn on the AC to max cool the air does not get cool at all. causing the PCM to turn the compressor clutch on and off. If the compressor turns on, can you tell if the. the compressor does not work all the time. If it doesn't then the clutch has an issue ranging from a broken wire to a failed clutch. The compressor clutch relay should be in the fuse box under the hood and it's marked MG CLT. Faulty Compressor Clutch. Flushed and evacuated system. How do I check if the compressor is still good I cannot see any clutch that engages when I turn the ac on unlike the compressor on my 02 toyota Tundra. To activate the compressor the clutch is activated. How to Fix Your Car's Air Conditioner. Ac hasn’t worked for years, finally had time to work on it, replaced accumulator and the two hoses from the compressor, got all mixed up on o ring sizes, crushed a few of them and wouldn’t hold vacuum. Make sure Puller Jaws are tight and secure on the pulley as they'll want to come off once it begins pulling. My TSM (I finally checked) said the clearance should be. Then look at the front of the compressor clutch. Then I heard kind of a "wooooooooooooooo" noise. This could be caused by a bad ac clutch relay, wiring between the relay or the ground to the clutch coil. However during normal AC operation the clutch operates in a continuous on/off/on condition to stabalize the freon pressure. The radiator fans should be running on low speed whenever the AC is on so I believe the AC looks for the fans and thens shuts off when they do not run. If your air conditioning isn't working properly, you may need to replace the A/C compressor clutch to fix the problem. I would welcome any ideas and suggestions. It has one wire going into the back top of the compressor and another wire into the top. Stop letting the dealership overcharge you for Audi AC Compressor parts. I have wondered if one could replace just the clutch-bearing or it meant a compressor evacuation by a professional. Hi my ac compressor turns very slow when it kicks on plus my condensor fan doesnt turn and cooling fan doesnt either what can i do now And the compressor clutch. Saw that the lines were freezing up. if the fuse blows,look for chaffed wires in the harness. This switch is located on the metal canister next to the compressor. I was watching the ac compressor clutch engage/disengage today after replacing my water pump, and I noticed it starts and runs smooth for a few seconds, but then stops, and after about 30 seconds it starts again, runs for 10-15 seconds and stops. I jumped the compressor clutch with 12 v and it kicked in as expected. According to the instructions, it should be between 35-45psi so I got another can. ** This paper is an effort to try to provide some troubleshooting information to TDI owners. It does not run in the vent or floor mode. bad compressor? My belt squeals horribly when I first turn the AC on and anytime after that when the compressor clicks on. Then look at the front of the compressor clutch. If you cannot turn the outer part of the compressor clutch then something is wrong with the compressor internally and you'll likely have to replace it to fix the problem. when AC is turned on (clutch engaged) the noise goes away. If you cannot turn the outer part of the compressor clutch then something is wrong with the compressor internally and you'll likely have to replace it to fix the problem. Here's how it starts: you notice it's too hot in your space and the AC is not achieving the set temperature. i took a screwdriver and spun the clutch on the pulley just to make. Mount the new compressor, fix the lines, but make sure you turn the compressor by hand a good few times to expel any oil from the cylinders, otherwise it will hydraulic. If you remove the relay and jump the terminals for the contacts, you should see the clutch engage. Can You Guys Help w/my Silverado AC Clutch/Compressor? Gordo,with the key on and engine off,turn on the A/C and tap the cluth face to see if it engages,if so,the. The engagement clutch, called an AC clutch, can also fail rendering the compressor inoperative. Mine does not. the compressor does not work all the time. The boys decided to ride with us in my truck. -2 and 3 hole puller plate fits most clutches, mechanical force does the pulling. If you have a question about your Volvo's air conditioning, please become an MVS member (free!) and post it to the correct area of the Volvo Forum. This article will help you decide on what to do when the AC compressor clutch is not engaging. NOTE: I am not a professional mechanic! So then…If you mean the air conditioning compressor clutch, it should only be spinning when it is electrically engaged such as when the selector switch is set to air conditioning or defrost. Both the pulley and the clutch should be spinning. compressor inlet line and turn the compressor by hand to see if you feel it sucking in the. If the clutch is engaging and disengaging rapidly, the refrigerant may be low. -2 and 3 hole puller plate fits most clutches, mechanical force does the pulling. Additionally, there are two more components to the system that control the operation when you turn the compressor on and off. I also bought a big tank of freon before the prices got high. 3) Inspect the compressor's clutch. I believe I was able to remove that shim and adjust my AC compressor's clutch air gap. The air conditioning system is a vital part of a vehicle such as a car or truck. I opened the hood and the clutch Menu. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. Your issue sounds like the compressor has failed (bearing, debris in the pump, etc. That's the part that engages and disengages the compressor. So today I figured It would just be an issue with adding refrigerant. However, if your clutch is not disengaging when you try to turn off your ac, then the problem is in your fcm. It should not turn once the magnetic clutch engages, and you could hear squeals of protest in the drive belt. system and completely remove your ac compressor. So start your diagnosis by determining if the compressor clutch works. Refrigerant Checks. Troubleshooting: Followed SM's "Compressor Clutch Circuit Troubleshooting" steps. This saves the compressor from constantly running and burning itself out. When you turn your air conditioning on, the A/C compressor clutch is the first part to move. How do I get the compressor operating in order to add refrigerant. My air has been running just fine but yesterday when I shut it off (it was finally below 90) the compressor. If the compressor pumps air. I was able to tap it with a rod today and it started again. Observe compressor clutch. It’s not the fact that your air conditioning system is cycling that is a problem, but the frequency that indicates problems. How to clean AC evaporator coils with no-rinse spray foam cleaner for routine seasonal maintenance. DIY Auto: Intermittant A/C. 2 litter with a slow ac leak. I probed the connector going to the A/C clutch and it shows around 8 volts when the car is on. Turns off when turned off. It does not run in the vent or floor mode. Both fans run, but no compressor engagement. Replacing the faulty clutch assembly does not necessitate replacement of the complete AC compressor or evacuation and recharging of the air conditioning system. A/C COMPRESSOR SERVICING 1992 Subaru SVX 1992 AIR CONDITIONING & HEAT Compressor Servicing * PLEASE READ THIS FIRST * CAUTION: When discharging air conditioning system, use only approved refrigerant recovery/recycling equipment. power to activate the relay). If it is low on charge you might want to look at the evaporator as being the source of the leak. Unplug your a/c compressor cluch. Faulty Compressor Clutch. I could bearly turn it at all. The ac clutch is not engaging when i turn on the A/C, it just blows out air (not cold). Some cars will have two electric fans, one is for the radiator and the other is the air conditioner condenser fan. A bad air conditioning relay will only keep the fans from running when the ignition is on and the air conditioning is turned on. if the clutch is bad, replace the whole AC compressor. Car makers use an electro-magnetic clutch to. Re: ac compressor won't turn on - 00 Mercedes C230 This system is a lot more sophisticated than you could imagine and you are in no way equipped to diagnose it. I am afraid its going to burn up my new compressor. Can someone please help me locate the air conditioning compressor & clutch? 8 Answers.