Ac Compressor Clutch Turns On And Off

Refer to Air Conditioning (A/C) Low Pressure Switch Replacement in SI. Figure out what’s wrong with your car’s A/C and fix the problem yourself, all for less than the diagnosis alone would cost at most auto repair shops. ac compressor clutch/coil removal DIY Here we go, as I promised, - enjoy! take a note of the belt routing before starting this procedure 1. (b) Set the dial indicator to the magnet clutch hub. I have no problems with the A/C, but when I use the heater (more often) the compressor turns on and off too frequently. Connect a test light between compressor clutch battery feed circuit (Dark Green wire) and compressor clutch ground circuit (Black wire). Should the ac compressor receive liquid rather than gas it will destroy itself quicker than you can turn off the switch. The AC compressor will normally cycle on and off while it's in use, depending on the demand for cool. I checked the fuses and they all look OK. The clutch CAN go bad without having a compressor problem. Immediately pulled off the road after turning the defroster off. -Check power to compressor. This clutch turns your compressor on and off based on your demands. It just spins free with the belt and the front part never turns. I can do this 5 or 6 times. Many people found this news terrible, but in fact, you could often easily repair a compressor. There should be little to no change in the noise's intensity based on other conditions like steering angle or other engine load. Why does my AC compressor cycle on and off is a common question that every AC contractor hears repeatedly. I know it has freon in it and is full. He installed the clutch for free and somehow the wire ended up wrapped AROUND the compressor shaft and shorted out there AND at the magnet connection. The clutch on the compressor is what allows the pulley to engage and disengage from engine power so that the compressor is only turning when it needs to be. Is it normal for the compressor clutch to engage and disengage when using the heater? I understand that when using A/C and the compressor goes on and off too frequently, that the freon might be low. How to Restart an AC Compressor Always turn off the proper breakers before beginning this fix. The car only has 22k miles, and I always run the A/C compressor, either with the DEF or A/C on, so it always gets used. Books say the compressor must turn on to get a proper reading. Terminals 14 and 17 at the relay should always have 12 V when the ignition key is at On, even with the AC and engine off. Then look at the front of the compressor clutch. The cycling on and off of the compressor is usually due to the increase in pressure as you charge the system. Sometimes the clutch itself can be. Hold down the recirculate button and the A/C button , and turn the ignition switch ON (II). Everything was OK as well. The Clutch On My Ac Compressor Cycles On And Off All The Time. It says the pressure is high. So far as cycling on/off, the A/C is designed to turn off the compressor just before the evaporator coils inside the car reach freezing temperature. You said it goes from low to high. The next step is to shut down your engine. If the electro-magnet is weak, or doesn't have full voltage to engage the clutch, it can cause the clutch to skip/slide instead of completely locking onto the pully, which will wear the clutch surfaces, and create an overheating condition, which then tends to melt the whole shebang. Wait to die. I decided to wait it out a bit. Typical Subaru Air conditioning Problems explained. Next, I ran a hot wire from the battery, directly to the clutch, just to verify that the clutch is really dead. A/C-Heater System - Manual Chevrolet: Pickup, Tahoe GMC: Sierra, Yukon DESCRIPTION The A/C system is a Cycling Clutch Orifice Tube (CCOT) type with a fixed displacement compressor and pressure cycling switch to control evaporator temperature. When I cycle the AC to ON, the clutch does not engage. I hear the clutch clicking in, and can see the outer plate being drawn in, as expected. So the wire has juice, but compressor or clutch dont turn on to cool the air. Replaced compressor clutch, evaporator, switch, and o-rings. Since I have a new York Compressor and good condensor, lines & drier I decided to use the original set-up and change to a Sanden Compressor/R134 down the road. Then switch on the ignition key and turn on the dash air. If the noise is there with the AC off, the problem is not likely to be in the compressor/clutch assembly, since with the AC off, only the pulley and its bearing is moving, and with the AC on, the pulley and bearing is rotating as a unit with the compressor crankshaft, so there is no relative motion. I checked voltage coming to it, and it was 12V when the A/C called for it to come on, and zero when it cycled off. It should be difficult but move. If the ac compressor is turning on when everything on your control head is off, then your control head is bad. The compressor puts the air conditioning refrigerant under extremely high pressure. When I push the AC button only the blower turns on, no AC. Refer to Air Conditioning (A/C) Low Pressure Switch Replacement in SI. How to Restart an AC Compressor Always turn off the proper breakers before beginning this fix. About 10 minutes later I can restart the air conditioner, and it cools perfectly. The ECU then outputs a 12v signal to energize the compressor relay which in turn energizes the compressor clutch. Compressor Overheating Troubleshooting | Air Conditioner Repair – So your air conditioner is blowing warm air? There are some problems with an air conditioner or heat pump compressors that can be avoided with proper maintenance. I have a 1997 Saturn SC2. According to the instructions, it should be between 35-45psi so I got another can. Hope this helps. You should also be able to turn it by hand. An AC compressor contains a motor with start and run windings. The clutch does not engage. Once it's engaged the compressor for no reason, it will stay engaged through engine stop / start cycles, and turning the climate system off. I have a 2005 3. Back off the power steering drive belt and remove the aircleaner box, this will give you complete access to the pulley/clutch. Turn off the engine and place the SUV in park. The a/c system is capable of turning the evaporator housing into a solid block of ice. This is not the case of clutch slipping. -Check power to compressor clutch activation. To give you some background on the problemthe end plate on the clutch fell off and so I replaced the bolt that was previously holding the clutch plate. A/C-HEATER SYSTEM 1995 Chevrolet Tahoe 1995 AIR CONDITIONING & HEAT General Motors Corp. The clutch does not engage. Turn off the AC and it quits making noise and the idle speeds back up. So, questions are, is it just the clutch or is it the whole compressor?. I started the engine, did the same test - the outer plate was drawn in, and I could see the compressor now turning. A compressor, Condenser, Evaporative (Evap) core, Expansion valve, receiver dryer, hoses and lines, thermo sensor and the controls. The clutch is not engaging. 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. With the engine running, set the mode button to panel vents only. My car has an automatic transmission. If #3 is the case, try manually engaging the clutch. Terminals 14 and 17 at the relay should always have 12 V when the ignition key is at On, even with the AC and engine off. Ford Freestyle AC Compressor Cost The average cost of a. When the compressor starts bubbles will form but quickly clear up. Only thing I can't turn are the crank of course and the AC. The problem was that I couldn't find it. Turn the air conditioning controls to MAX AC and start the engine. The clutch will engage when I turn on the a/c and will get cold, however the compressor will not cycle on/off as is usual but is on 100% of the time until i turn the a/c off via the knob inside the vehicle if that makes sense. 15) Disconnect compressor clutch harness connector. I checked voltage coming to it, and it was 12V when the A/C called for it to come on, and zero when it cycled off. A quick way to confirm compressor clutch failure is to manually turn the AC on and off. I have an intermitted AC clutch issue. An AC compressor contains a motor with start and run windings. So start your diagnosis by determining if the compressor clutch works. I used a pump to vacuum AC system - pump ran for two hours and I left gauges on overnight to verify no loss of vacuum. Therefore, it's necessary to open the hood and have a friend turn on and off the air conditioning to physically see if the clutch is engaged. The motor turns a piston that compresses the system's refrigerant. Get a Denso with clutch installed. The clutch does not engage. It worked perfectly. AC–90 AIR CONDITIONING – COMPRESSOR AND MAGNETIC CLUTCH AC 3. I'm assuming the compressor must be seized and that's what causing the bolt to break. vw tdi compressors don't cycle on and off. My ac compressor is not kicking on. Well, sometimes these sensors short out and will not allow compressor operation. If there is cold air, find and fix electrical problem preventing compressor clutch from engaging (a/c fuse, a/c on off switch, bad a/c relay, bad trinary/pressure switch, bad "compressor locked" detection switch, bad evaporator temperature switch). Now try to turn the clutch plate by hand, that will turn the ac compressor. The A/C compressor pulley/clutch is a piece of cake to do. The only time it turns off is when you press accelerator pedal to full throttle, then clutch kicks off to give you extra acceleration power. Get the junkyard compressor swap the clutch first. It should be difficult but move. It’s not the fact that your air conditioning system is cycling that is a problem, but the frequency that indicates problems. Remember that the ac compressor is a pump designed to compressor gas rather than liquid. I'm fairly certain I am having this problem. I did have to remove the compressor from the system to pull the motor before I had the chance to charge it when my cam went, so some oil was lost, but only about a tablespoon. I use the A/C to keep the fans on, so I turned the ignition on and the A/C off. A car does this too. Turn the air conditioning controls to MAX AC and start the engine. This indicates a problem with the A/C compressor clutch relay or related wiring. By attaching a voltmeter between pins 6 and 8, you can monitor the voltage drop across the thermistor. This is a port hole that allows viewing the actual Freon inside the system. Since my coolant/thermostat has been fixed, my AC has never turned back on and now my Compressor clutch won't engage. Over a certain number of years, this stress will wear down the compressor and cause it to eventually malfunction. A compressor, Condenser, Evaporative (Evap) core, Expansion valve, receiver dryer, hoses and lines, thermo sensor and the controls. Now it keeps freezing up and the compressor won't shut off. A defective relay, compressor clutch coil or damaged compressor are all possibilities. No Check eng. Third, the A/C compressor relay is a $4 throwaway part, like the fuel pump relay. So, bought a DIY R134a kit with a pressure gauge and hooked it up to the low side to see if the refrigerant was low. The fact that it cycles on and off is either low pressure OR the trinary switch. If you do find that your car’s air conditioner compressor is cycling on and off too quickly, then it likely indicates that your vehicle’s electronic module is failing. Since I have a new York Compressor and good condensor, lines & drier I decided to use the original set-up and change to a Sanden Compressor/R134 down the road. The availability of 12 V at terminal 17 should be verified, as without this the relay can't activate. Turn the air conditioning controls to MAX AC and start the engine. I figured the clutch was bad, and took it to a shop to have it replaced (I'm getting lazy!). the compressor does not work all the time. A/C-HEATER SYSTEM 1995 Chevrolet Tahoe 1995 AIR CONDITIONING & HEAT General Motors Corp. Couldnt get to the ground cable. 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. This is essentially what turns your Compressor on and off. Why does my AC compressor cycle on and off is a common question that every AC contractor hears repeatedly. -Check power to compressor clutch activation. use 15mm open end wrench or anything similar to pull serpentine belt tensioner towards the front of car, this will release the tension of the belt and have a nail ready so that you can push the nail through the both openings and lock tensioner in released. My AC compressor is making a noise - I've been told I need a new compressor : This page was written either before or soon after the millennium and applied to the AC of most cars at that point. If you do find that your car’s air conditioner compressor is cycling on and off too quickly, then it likely indicates that your vehicle’s electronic module is failing. I did have to remove the compressor from the system to pull the motor before I had the chance to charge it when my cam went, so some oil was lost, but only about a tablespoon. Runs for 11 min then it quits. With the engine and key off, try turning the compressor by hand. It goes away when the ac is turned on. Turned the air on and off multiple times and the compressor clutch is not kicking in. If the system were where it is supposed to be, the compressor would kick on/off constantly once the system has been run for a little while. To give you some background on the problemthe end plate on the clutch fell off and so I replaced the bolt that was previously holding the clutch plate. Turn key off. Why would the clutch on my air conditioner fail? An air conditioner clutch is mechanical and electrical and is prone to wear and tear. Once in a while, I want to turn off the AC but pressing the ECON button, and the compressor is still runningI am guessing a faulty sensor or a stuck compressor clutch. A car does this too. -Check power to compressor clutch activation. So start your diagnosis by determining if the compressor clutch works. I drive the car or let it idle for 1/2 hour twice a week. There may be slight changes in HOW cold it is. However When I went to take a look the AC clutch kept engaging for a few seconds, and then would turn off for a few, and kept going in a cycle. How do you do this? I have a 1990 K1500. Terminals 14 and 17 at the relay should always have 12 V when the ignition key is at On, even with the AC and engine off. If there wasn't enough in the system, it wouldn't even do that. The compressor is the 'heart' of the air conditioning system, moving refrigerant through the system. Find Bike Parts, Bodies, and Frames Right Here 4x Motorcycle Led Turn. Pull the wire connection at the compressor and put a multimeter on it. If the compressor clutch gets damaged, it will keep the air conditioning system permanently on or off. We recommend if one goes bad, both should be replaced. So today I figured It would just be an issue with adding refrigerant. (Just a quick press will do) I forget the pressure at which the switch will cut the compressor out but you could still have too low a charge which will not allow the compressor to engage. Our best guess is that your problem is with your AC compressor or the AC compressor clutch. 15) Disconnect compressor clutch harness connector. My compressor keeps cycling off and on it cools for a little while then quits - Answered by a verified Mercury Mechanic. Repairing a Deere 317 48" Mower Deck. AC compressors endure a lot of stress. Typical Subaru Air conditioning Problems explained. If I turn it off (either turning the knob off for the blower or pressing the push button for the AC) then turn it back on i can hear the ac kicking on and the air start to get cold. 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. Repairing a Dodge Ram Air Conditioning and TIPM. So today I figured It would just be an issue with adding refrigerant. When you push the ac button, clutch should engage and stay on as long as the button is not pressed again. I have a 2001 379. When the temperature of the evaporator is below 40 degrees F, the Voltmeter will read 4-5 volts which turns the Air Conditioner Compressor OFF. If your compressor is not turning on, or not turning off, the problem may be with your clutch or clutch brushes. The clutch CAN go bad without having a compressor problem. This prevents compressor damage, since the lubricant for the compressor is circulated through the. So some clutch on-off action is normal during operation. Turn the air conditioning controls to MAX AC and start the engine. Can you turn the center part? When turned off the outside should spin free, but if the internal mechanism is locked / seized you won't be able to turn the center disc part of that clutch. The motor turns a piston that compresses the system's refrigerant. Also, I wouldn't recommend hot-wiring your AC clutch. It goes away when the ac is turned on. Is that because it can't fill if the compressor doesn't kick on?. Sometimes the clutch itself can be. Why would the clutch on my air conditioner fail? An air conditioner clutch is mechanical and electrical and is prone to wear and tear. I think that I did not understand your problem the first. Where to Start AC Clutch Diagnosis. On these settings, compressors turns on and off every 10 seconds approximately. Perform the Air Conditioning (A/C) System Performance Test in SI. A/C starts off cold then blows warm Help, Advice, Owners' Discussion and DIY Tutorials on S40 and V40. If test light illuminates, go to next step. I accidently broke my ac clutch wire clean off the coil. 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. You can notice this by the water dripping from a window air conditioner in the summer. AC/Delco replaces the clutch and compressor as a unit. I started the engine, did the same test - the outer plate was drawn in, and I could see the compressor now turning. Air conditioner intermittently works. The process then repeats. Next, I ran a hot wire from the battery, directly to the clutch, just to verify that the clutch is really dead. Try shutting the compressor off and if it continues to run, remove the relay. Follow the wire that goes from the AC compressor to the clutch relay mounted on the firewall. I have a problem with my AC system on my 2008 KW with Cummins Isx. Air Conditioning System: Electrical For this issue of Fiero Focus, we’re going to continue our electrical circuit path discussion topic; this time of the Air Conditioning (A/C) system. I did have to remove the compressor from the system to pull the motor before I had the chance to charge it when my cam went, so some oil was lost, but only about a tablespoon. To close the main relay contacts and thereby turn on the compressor, the ECM grounds terminal 16. Air conditioner intermittently works. You are either too low on freon, you have a power/ground issue meaning the compressor isn’t receiving the signal to turn on, or the clutch itself is bad. on this setting,the compressor would run all the time. Is it normal for the compressor clutch to engage and disengage when using the heater? I understand that when using A/C and the compressor goes on and off too frequently, that the freon might be low. 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. The red knob adjusts the temperature at the evaporator at which the compressor will be turned off to avoid evaporator freezing (factory target is about 34F). Replacement compressor clutches are available from auto parts stores and automotive dealers. If I turn it off (either turning the knob off for the blower or pressing the push button for the AC) then turn it back on i can hear the ac kicking on and the air start to get cold. You should now have 12 volts at the air conditioning compressor clutch. Start it back up, ac compressor clutch is running again. Turned the air on and off multiple times and the compressor clutch is not kicking in. The type of compressor used by many cars in the UK has changed drastically since that time so if your model is say 2003. It is low on freon and that is the reason for the cycling. The AC Runs okay for sometime and then the sensor turns it off (not the AC light /button which remains on) and then again it turns it on. I accessed your websit for info regarding Stratus. Upon reaching the set cabin temperature, the clutch is again disengaged and this cycle goes on till you turn off the AC. A/C compressor turns on and off Oct 15 2012, 10:17pm Hey guys got a little issue with my dads truck the compressor turns off and on the entire time its on and we were told it was the temperature sensor that was bad. If you hear a loud CLACK, the electric clutch is functioning properly. 16) Check for poor connections at compressor clutch. A defective relay, compressor clutch coil or damaged compressor are all possibilities. The clutch does not engage. It can also break meaning it will not receive power from the engine. com Car Chat > Honda > Let's get Technical! > Recharged AC and now the compressor turns on and off constantly. Perform the Air Conditioning (A/C) System Performance Test in SI. An air conditioning problem has reared its ugly head with the warm weather coming. Air conditioner intermittently works. If its the AC compressor shaft bearing then you will need to buy a new compressor. Then look at the front of the compressor clutch. Compressor clutch is not moving Another sign of a problematic compressor is the clutch not moving. Yes, if your compressor is low on oil, you need to check whether there are any filings in it or in the lines. I replaced the compressor and was refilling with 134a and the clutch will not kick on. Repairing a Deere 301 Tractor. The outer part of the pulley assembly is always turning when the engine is running, and it should spin freely. The pulley bearing slips over a sleeve outside the shaft, so the pulley moves freely. To give you some background on the problemthe end plate on the clutch fell off and so I replaced the bolt that was previously holding the clutch plate. Last night the ac started blowing cold and was this morning then started back on the compressor turning on then off. 1) Turn on the vehicle's engine and turn the air conditioner on and set the AC system's fan to high speed. Repairing a Dodge with the Death Wobble. My AC is blowing only warm air. Could these two issues be related or am I off-base? I have a 2011 Cruze with 79k miles and these seems to be too many issues given the mileage so thought they might be related. turn on the air. Hi! I had a problem with my 2004 MustangGT 2v4. -Pull bumper, turn on AC, stick eyes and ears down there. I accessed your websit for info regarding Stratus. The compressor is also control by the engine computer on many cars. Refer to Air Conditioning (A/C) Low Pressure Switch Replacement in SI. (Just a quick press will do) I forget the pressure at which the switch will cut the compressor out but you could still have too low a charge which will not allow the compressor to engage. After that, I only needed to read the compressor replacement procedure, to convince my self that I don't really want to deal. Just my two cents for what it's worth. once the pressure comes back up to around 40 psi the compresor will come back on untill the pressure goes down again. Get the junkyard compressor swap the clutch first. ok at idle(600-700rpm) when you turn the ac on you can feel the truck somewhat shake, very minute, but almost like a slight misfire. The type of compressor used by many cars in the UK has changed drastically since that time so if your model is say 2003. I accidently broke my ac clutch wire clean off the coil. Take a length of wire and run it from the compressor's wire to the positive (+) terminal of your battery. 1997 Ford Ranger AC Compressor kicking on and off every 10 Turning When System Is Off, Noisy. Cost a total of $85 verse around $120 for the clutch + freon. This can be done several ways, but the. Is it normal for the compressor clutch to engage and disengage when using the heater? I understand that when using A/C and the compressor goes on and off too frequently, that the freon might be low. Then switch on the ignition key and turn on the dash air. There are some differences in the video and my compressor. is disabled and there is no way to turn off the A/C compressor. Air Conditioning System: Electrical For this issue of Fiero Focus, we’re going to continue our electrical circuit path discussion topic; this time of the Air Conditioning (A/C) system. Yes, if your compressor is low on oil, you need to check whether there are any filings in it or in the lines. So, the compressor is not mechanically locked up. The process then repeats. Find the connector in the middle of that wire, and unplug it. Replaced compressor clutch, evaporator, switch, and o-rings. How to Restart an AC Compressor Always turn off the proper breakers before beginning this fix. When the temperature of the evaporator is below 40 degrees F, the Voltmeter will read 4-5 volts which turns the Air Conditioner Compressor OFF. In this video, I show you how to tell if a car's AC compressor clutch is engaging. A faulty compressor clutch can be replaced but it is generally recommended to replace the whole compressor to save time and additional cost. I read in a couple of threads that you guys are jumping the clutch. Nope -- I could see the compressor was not turning (center portion was stationary). If the clutch engages but the compressor does not turn (the belt will start to slip and squeal), the compressor is locked up and you need a new compressor. The pulley bearing slips over a sleeve outside the shaft, so the pulley moves freely. Since my coolant/thermostat has been fixed, my AC has never turned back on and now my Compressor clutch won't engage. If the compressor does operate correctly after tapping on the switch or jumping the low pressure cycling switch connector, replace the low pressure cycling switch (2), P/N 89040362. I've got the opposite problem, my clutch never kicks out when I have the AC on (clutch works just fine) and my condenser ices over to the point that it either blocks airflow through the ducts or it starts blowing snow around the truck, it'll stay frozen solid until I manually turn off the AC for a few minutes and let it defrost then I have good. 018" (about the thickness of a business card). Compressor clutch is not moving Another sign of a problematic compressor is the clutch not moving. Next, I ran a hot wire from the battery, directly to the clutch, just to verify that the clutch is really dead. It’s not the fact that your air conditioning system is cycling that is a problem, but the frequency that indicates problems. At this point, the low-pressure switch opens and disables the clutch. 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. However When I went to take a look the AC clutch kept engaging for a few seconds, and then would turn off for a few, and kept going in a cycle. The accumulator or dryer looks like a long cylinder, it has a pressure switch on it and two wires attached to it. The inner part of the pulley is what actually makes the compressor turn. I checked the fuses and they all look OK. Since my coolant/thermostat has been fixed, my AC has never turned back on and now my Compressor clutch won't engage. Fourth auto elec $350 if I supply the coil because his supplier no longer exists. Check the actual gap on the compressor clutch. Otherwise, the system would freeze. It definitely is coming from the AC pulley. 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. Should the ac compressor receive liquid rather than gas it will destroy itself quicker than you can turn off the switch. check your ac compressor magnetic clutch attached in front of ur compressor if its working/ ac clutch engage when u turn the ac switch on and disengage when u turn the ac switch off/ it normally makes a clacking sound when it engage with the rotation of ur compressor/ if its not engaging it means ur magnetic clutch is stuck up giving. About 10 minutes later I can restart the air conditioner, and it cools perfectly. The compressor is the 'heart' of the air conditioning system, moving refrigerant through the system. If your Thermistor is reading 4-5 volts when you first turn the AC on then your Thermistor is defective and needs to be replaced. A quick way to confirm compressor clutch failure is to manually turn the AC on and off. Since the clutch engages, there is enough refrigerant in the system (pressure) for the clutch to engage. In the afternoon when driving home from work with outside temps around 85-90 degrees, the AC will work fine for about 5-10 minutes then the compressor will start to cycle on and off every 6 seconds while driving and the inside vent temprature will rise to 52-58 degrees. When the temperature of the evaporator is below 40 degrees F, the Voltmeter will read 4-5 volts which turns the Air Conditioner Compressor OFF. It has one wire going into the back top of the compressor and another wire into the top. If not enough coolant flows from the high pressure side through the evaporator, then the low-side pressure can drop below about 23 PSI. Turn key off. Just an update for anyone looking to do this. Began filling low side with new can as vapor, with hi side closed. Is that because it can't fill if the compressor doesn't kick on?. Since car air conditioning systems get turned on and off constantly, this power fluctuation puts a lot of stress on the compressor. Conversely, when the electromagnet device or the a/c compressor clutch coil is turned off, the friction plates will spring apart in effect. Air Conditioning System: Electrical For this issue of Fiero Focus, we’re going to continue our electrical circuit path discussion topic; this time of the Air Conditioning (A/C) system. But, watch for the belt slipping on the pulley as the cause of the compressor not turning. Turn the AC setting to the "off" position. There is a 'sheer plate' mounted to the front of the compressor that when the compressor fails, will break off, and can look like it is missing a clutch. There are basically three sections to the AC system; the sensors (high and low pressure sensors and the AC on/off switch), the command unit (the powertrain control module- PCM), and the “doing” components (the compressor clutch relay, compressor clutch, and the compressor). The following readings were taken using an OTC 500 meter and OTC current measuring clamp; they are off of a 1986 Le Baron: Clutch resistance: 5 ohms, as measured at the clutch connector. This is a port hole that allows viewing the actual Freon inside the system. 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. Last night the ac started blowing cold and was this morning then started back on the compressor turning on then off. The sensor tells the computer what the air's temperature is at the exit point of the evaporator. I have a 2005 3. At this point, the low-pressure switch opens and disables the clutch. The Air conditioning (AC) system in your Subaru is made up of the following. 1997 Ford Ranger AC Compressor kicking on and off every 10 Turning When System Is Off, Noisy. Replied by wysetech on topic Air conditioner Compressor Cycles ON/OFF That car has a cycling compressor clutch switch (CCOT) type system. The ECU then outputs a 12v signal to energize the compressor relay which in turn energizes the compressor clutch. The clutch is always disengaged and the compressor pulley rotates freely untill you switch on the AC. Will low refrigerant level cause the AC compressor clutch to not engage 15 Answers. Since the compressor pulley is constantly rotated by an accessory belt that is typically connected to the crank pulley, a compressor clutch is necessary in order to turn the system on and off. It would make constant cold air though, the vent air would never go warm. The compressor won't run without refrigerant pressure so you need to remove the AC clutch relay and jump pins 30 and 87 to engage the clutch. check your ac compressor magnetic clutch attached in front of ur compressor if its working/ ac clutch engage when u turn the ac switch on and disengage when u turn the ac switch off/ it normally makes a clacking sound when it engage with the rotation of ur compressor/ if its not engaging it means ur magnetic clutch is stuck up giving. What does this mean and how can I fix it? Oh, the blower works fine and both the inlet and outlet pipes to the accumulator are about equally cold. Well, currently no issues with getting the compressor on. Opening up the system is the last resort.