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. I Have Checked The Relay. When it is off, the fanbelt just runs over the clutch and does no The AC is not "on". Will low refrigerant level cause the AC compressor clutch to not engage 15 Answers. The guy at the electric shop tried to convince me to run a ground from the relay so the compressor would stay on (all the time), not knowing I knew better. Did not want to charge the system if there is refrigerant at the correct level. JavaScript is disabled. After a while it starts to engage for few seconds and than back off for about 10-15. When the compressor clutch is engaged, a current move through the electromagnetic coil. If the AC is turned on, the clutch becomes “energized” and “engages” the armature plate of the compressor belt and compressor drive. Checked the fuse and it is good. The noise is a whirring sound. Okay, So I took my vehicle to a couple of hack shops, The A/C shop told me I had a ground problem so he sent me to a auto electric shop. Pressure is not cycling 35 low 150 and up on high. A forum community dedicated to Chevrolet and GMC diesel truck owners and enthusiasts. Okay, spray some water on the condenser and see what happens. Yes, trial and error we will find the problem. when ac or defrost on clutch engages and motor has a serious load that effects idle... and ac stop blowing cold air - Ford 1996 F150 Regular Cab question From all indication you may have a bad control head. Will try to find a while during the week end to see if it can be fixed. O'Reillys said I probably got a faulty switch from them. For a better experience, please enable JavaScript in your browser before proceeding. The AC compressor switches on and off when idling, with a clicking noise. I just noticed that the AC compressor will engage if the AC button is pressed (indicator light on) even with front and rear blower switches set to off. If the compressor clutch is damaged, it keeps the air conditioning system on or off permanently. Most AC clutches are designed to spin freely when disengaged, and also with the pulley and compressor when those are engaged. AAMCO recommends having the system checked and charged, as operating an air conditioning system in this condition causes further damage. Thank you. It sends a signal to the ECM to turn on and when you turn off the A/C, the signal is still being sent. That is the first good idea I have heard yet! Who knows, maybe the new ones are not wired correctly? Is it supposed to be engaging even if your in the red … The compressor clutch consists of a friction plate positioned adjacent to an electromagnetic coil. I get good heat and excellent cold. It then immediately re-engages as soon as the RPMs start increasing again. Ac turning itself off and on. When it is off, the fanbelt just runs over the clutch and does no … I will get one tomorrow and let you know the results. I will do you one better Ken. Whether the clutch operates or not will all depend on the AC itself. Needless to say, I am not going to try another new one. Start the engine and turn on the A/C. A delay can cause serious damage to … The colder the day is the faster it will cycle off. … :-/. Clutch on compressor is not turning. Even when the pressure should have made it turn off. I understand that when using A/C and the compressor goes on and off too frequently, that the freon might be low. 97 K2500 Suburban, 3.42, 265 Tires, Custom Oil cooling lines, Snorkel removed and 4" Heath Exhaust and crossover. Wrong. Let me just reiterate, I did find a wire crossed at pressure switch to make the compressor run 100% of the time (fixed) The compressor, pressure switch, expansion valve, dryer have all been replaced, system has been evacuated, flushed, but the pressure is running to high on the high side. had a can of coolant hooked up checking preasure. This situation is dangerous due to the serpentine belt powering not only the AC unit, but the vehicle's charging and cooling systems as well. Compressor, condenser, evaporator, expansion valve, dryer, triple pressure switch, relays, thermal control amp, control head and even swapped the ECU! Motor Vehicle Maintenance & Repair: My ac was not working so I installed a new ac pulley, clutch plate, and coil. I even get both fans running too! I have a 2007 Hyundai Tucson. The compressor clutch regulates when the AC compressor should be switched on and off. Watch what cleaning agent you use as a lot of those will literally melt any plastic they touch. I have replaced; compressor, dryer, expansion valve. Again, this is something that should be checked out by a professional. PROBLEM IS WHEN AC/HEATER CONTROL IS SET TO ANY POSITION BESIDES OFF, THE AC COMPRESSOR CLUTCH KICKS IN AND OUT ABOUT EVERY 3 SECONDS CAUSING THE IDLE TO VARY FROM A … read more. Small cars typically have stacked AC and engine radiators cooled by a single fan. It just seems to me that 13V SHOULD be enough. The AC is not "on". It appears I have a ground problem, that was the answer from the A/C shop. While A/C clutch is engaged, pressure gauge shows it to be on bottom side of green. Matuva - if you can get your control panel to shut off the A/C light with the button pressed ON, just by wiggling the blower switch, you have issues in that switch panel. However, this can cause existing issues to be amplified. Clicking this will make more experts see the question and we will remind you when it gets … I was talking with the guy at O'reillys. A bad AC compressor clutch needs immediate fixing. The compressor is designed to cycle on and off. Not a whole lot was resolved. I Had No Intentions Of Fixing But The 104 Degree Weather In Tx Is Starting To... Do I Need To Flush A/c System Before I Add Oil To It? When the AC is off the pulley and bearing are still spinning. It does it when the AC is turned off and when the AC is on. If the A/C clutch relay is stuck or the switch is faulty then the clutch will stay engaged. I have 2011 Mazda CX7. clutch disengaging every couple seconds. A good test would be to unplug the compressor (whilst … Hello, thank you for writing in. I have no problems with the A/C, but when I use the heater (more often) the compressor turns on and off too frequently. Is this normal or did someone rewire the AC controls? The clutch is controlled by the A/C button, not by the blower switch. Eighty degrees outside (Texas). Vocational, Technical … I have this exact issue haunting me right now. Want Answer 0. I suggested some testing in my last response. Typically, the pulley will freeze due to a malfunction in the electronic clutch or the failure of the … If you can name it, I have changed it. Sure, he is not the one that has to reclaim, vacuum and recharge 134a. My A/c Is Blowing Hot Air. Lol. The blower switches have nothing to do with the clutch engaging, in ANY GM vehicles. I have a 98 S70 T5M. If the compressor clutch does not engage, turn off the engine. Changing the compressor clutch could be the only solution in this case. Roy, before I get a command center let me say that the compressor clutch would stay engaged all the time. An AC clutch engages and disengages the compressor when your car's air conditioning is turned on and off. I'm wondering if the button contacts are still making somehow, guess I might stock in a new button just in case. At 35, the clutch will stay engaged. 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. When i first start the car, the AC engages every time and blows cold. Is There... My A/c Has Been Acting Up Like This For Almost A Year Already. Please confirm this so we can continue. I installed a remanufactured AC compressor and the clutch makes noise when it is engaged. A/C clutch engaged all the time. Compressor clutch disengaged and both rad fans stopped running. 1993 Chevy Silverado 3500 6.5/4L80E, 4.10's. years ago when this was not built in we used to run the AC with the heat turned on to rid the rig of foggy windows. Best way on earth to keep the fog off the windows. When it is turned on it will start to spin. Motor running, AC on max, fan on high. I just wanted to be certain there weren't any other parts or service issues I needed to be aware of … In most cases, when the AC compressor and clutch engage, it will draw extra ’power’ from the engine and cause the idle to slightly drop. If that doesn't work then I'll replace the clutch. Okay, do you mean if you have less than 20 lbs of pressure on the low side, the compressor is still engaged? I only had that happen once, and I melted a blower switch because I figured it wasn't serious. The ac pump runs with defrost as it dehumidifies the air, assisting in defrost/defog of the cabin air. Now it seems to be working fine again. I will remove that signal wire from the ECU from the relay tomorrow and report back my findings. Okay, Let me start over, I have had my vehicle to shops. With the ac off your clutch the outer non belt driven part will not be turning. Come join the discussion about duramax engines, performance, builds, modifications, classifieds, troubleshooting, maintenance, and more! GLYN, if you get any further along, please post it here. Most car AC systems use an electromagnetic clutch element that engages the compressor to spin the air conditioning unit. That is a good one, I have the wiring diagrams here and I am looking over as well, you can confirm that when you remove the ground (pink wire) from the ECU the compressor turns off? I have shot all wires in this system to the ECU and I have nothing grounding out. The noise stops when the clutch disengages. Because the clutch is attached to the compressor shaft, if it becomes … In some cases, a vehicle may idle poorly when an air conditioning compressor clutch engages, which is typically due to the extra load imposed by the pump. flowmaster, fumoto, chrome hummer wheels, Leer topper, blizzard 810:blizzard: high idle, awaitng secondary fuel filter and lift pump, braided stainless custom oil cooler lines, cutom boost controller, optic bump, mandrel bent 2.5" crossover,3" downpipe, 3" straight pipe, boost gauge valet remote starter,K&n filter, 285's, blizzard 810, Duramax First Generation: 2001-2004 (LB7), Duramax Second Generation: 2004.5-2005 (LLY), VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. When you turn on the heater it engages and dis-engages the air conditioner compressor in other words it clicks on and off and when it engages it makes the motor cut out bad and even when you turn on the air conditioner it makes the motor cut out. Same thing : AC clutch engaging an erractic way with blower switch off and AC button on. The electrical auto guy says it is a thermostatic meter. I have the same electrical gremlin in mine. That creates a strong electromagnetic force that pulls the … It has to drop below 20 to disengage the clutch. I have replaced expansion valve, dryer, Freon. It does this to maintain the seals in the system and circulate verything around. I notice, however, that the clutch plate engages and disengages fairly regularly (may be every minute). I have a work around in mind. When I first turn the car on I can see the A/C clutch being engaged, but after the car runs for bit, then clutch disengages. I am really starting to give the new pressure switch the stink eye. Then look at the front of the compressor clutch. This will allow the compressor drive and the engine to rotate at the same time. Bought this car about 6 months ago and its finally getting hot enough to test the AC. Both the pulley and the clutch should be spinning. In this video, I show you how to tell if a car's AC compressor clutch is engaging. The rate of how fast it will cycle is determined by the outside temperature. The interior switches collect lint and tiny particles of dirt/grit from the air and sometimes are "interrmittant" in operation. Seems to me right after I rebuilt the entire AC system, I had rapid clutch cycling. Pink wire grounding th relay. Can you test the AC switch to make sure the signal is being cut when the switch is off? Why Do I Have White Fog Coming From Air Vents Even When Air Is Off. The Wiring Is Showing A Current And My Compressor's Clutch Clicks And Turns When... Each Fan Speed Blows Out Much Less Air Than It Use To. If I touch the the blower switche and gently shake it (more or less gently, depend on how is my mind at the moment), still on off position, lights comes off and clutch disengage... Further information on the defrost cycle. It's Like There Is A Blockage. I Don't Hink This Car Has A Cabin Filter. Yes sir, clutch stays on. An air conditioner clutch that repeatedly engages and disengages is usually an indicator that the vehicle's system is low on refrigerant. There is a writeup over at jeepsunlimited.com about wiring the pre-91 AC clutch so that more voltage gets to it thereby kicking it on. Air conditioners operate as a closed system. That is why it disconnects when you remove the wires from the low pressure switch. Very weird! From the looks of it, the climate control head is commanding the compressor on all the time. On the other hand, i've read that the clutch usually gets disengaged temporarily whenever a … pfffffffff, so, one more spare part to buy... Will do so. Mine does it once in a while, not really worried about it just a curiosity, cycling the button cures it. My air is nice and cold, has the right amount of PAG and refrigerant, but when the car starts, I can hear the clutch engaging with the system turned off. Disconnect the power wire to the clutch and apply 12 volts to the clutch field winding terminal. when on preasure shot up to max and when off was at normal. had the ac serviced at perry tech last summer. This condition can usually be remedied by simply unplugging the wire that connects to the clutch if the expense of actually repairing the system is too high. It is a thirty degree old school mechanical switch stuffed onto the EVAP core, a relay and a master kill switch for winter use. It looks as if the ECU is programmed to disengage the clutch automatically whenever the engine RPMs lower too much, but i never found anything like this in any documentation about automotive ac systems i read so far. Posted by rick lee on Jul 12, 2012. Low 35 are so, high going up to 250. 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