Mustang Ac Compressor Cycles On And Off

Causes of Air Conditioner Compressor Problems. A car does this too. How long should my ac compressor keep on running before it automatically turns off. Air Conditioning Trouble Shooting FAQ's from Vintage Air The following guide will help the installer determine if a problem exists in the system that would cause a malfunction. High speed still works if the engine gets hot enough. Turn the air conditioning controls to MAX AC and start the engine. And the clutch is what starts and stops it. It's fairly common for someone to install a rebuilt or even new factory style compressor, (A5, A6, R4, RV2, York, Tecumseh, etc. I have a 2000 mustang gt with a ac compressor noise. smoke through the vents coming out of the side of the hood. If your compressor is not cycling on, then you should seek the help of an A/C professional immediately. shows 37-39 degrees. When it does that try shutting. If it is doing so rapidly, though, it can indicate an improper charge (such as being low on R-134a refrigerant). Those guys are probably right on with the IAC and throttle plate but I would probably go ahead and put a set of gauges on the car just to satisfy myself that there was not a partial restriction in the system causing high head pressure on the AC compressor creating large amounts of drag at idle. All of the AC functions will operate with the same AC control panel and will operate just as before the HeaterTreater installation. Read more Ford reviews to learn about other models. Customer satisfaction is our number one priority. Of course the fans kicked on whenever the clutch engaged. The problem is we can't find the switch, relay, thermostat to control the A/C's cycling sequence. Fast, same day shipping. Thanks for your. To maintain the Mustang air conditioner and the Mustang heater, make sure you see a professional technician, like the team at CJ Pony Service, at least once per year. Unfortunately, frozen AC lines can put a major kink in your road trip. Help for Low Cooling Output in Air Conditioners eHow www. Then, it happened again, and again! The air conditioner compressor was rapidly cycling on and off. 1964-73 Mustang and 67-73 Cougar. Automotive Air-conditioning Compressor. If the cycles are very rapid the refrigerant level may be low, but the compressor is not designed to run full time when the AC is on. How often should an AC compressor engage and disengage? At idle, mine will run, disengage for about 3 seconds, then engage again. In that case, you’ll want to add a few ounces of A/C Pro. The clutch cycling switch cycles the compressor according to the pressure in the accumulator. If the LPCS is turning off the compressor before it reaches the PSI point that you set it at, it needs to be replaced. 3L? that lubricate and keep the entire AC equipment in a operating status. In more severe cases, where the switch has completely failed, your AC system will completely cease to blow cold air. When I press the button to turn on the air conditioner, the panel light illuminates but the a/c compressor does not engage. Where is the AC Relay fuse located at on a 1994 Ford Mustang The ac compressor comes on when we run a wire to it from the battery and when we turn it off undo the wire it will not come back on?. Modern AC systems have both an under pressure and an overpressure safety switch, either will cause the compressor to turn off. This is causing a feedback pressure on the compressor, causing it to rattle or shake from the increased cylinder head pressure. This small fan cools the compressor. It is the relay control grounding circuit on your pcm that appears to have shorted it transistor cuasing a constant ground allowing the fused 12v feed to the relay to allow it to be on all the time. After the car sits for a while it might work again, might not. Your AC should only run when it is either on the two AC settings or when it is on the Defrost only setting or the mix of defrost and heat to the lower vents. if the system is cycling on and off very frequently or more rapidly than normal, it could be a sign that the cycling switch is not functioning. 8L Air Conditioning (Description and Operation) The A/C refrigerant system is a clutch cycling orifice tube type. my ac system blows hot air so i thought the pressure was low, and got a can of r-134a and added it. The Perfect Fit ELITE™ 1968 Ford Mustang air conditioning system is engineered to actually fit a 1968 Mustang, not a single unit that is adapted to fit a whole product line like competitors. The compressor would cycle on/off before it would cool down. When the AC compressor cycles on/off the rpm hiccups for just a second then stabilizes. This information is intended to give the average individual an average understanding of not only what each part is, but also how it functions within the system. Suspected Low R134, charged and still have the problem. There are several possible causes as to why an air conditioner’s. These switches between on and off can be noticeable on the engine's rpm, and you may see or feel fluctuations from it. ac not cooling but freon full and compressor working. The past few days the temp dropped and I haven't used the ac. In more severe cases, where the switch has completely failed, your AC system will completely cease to blow cold air. Onto Google I went. A re-built unit. Then compressor starts again and all back to normal. It comes equipped with carefully sized, large, separate A/C and Heat coils just like factory (OE) systems, not combined A/C/Heat coils often found on. It's not the "canister" …which is referred to as the "dryer" and does maintain the extra liquid refrigerant …R134a …for the entire system. Excessive gas will harm your system and will keep it from cooling properly. My 1997 F150 4. If your compressor isn’t coming on at all, even with your air conditioner cranked up, it could mean your system is low on refrigerant. It's worked perfectly since day one. Remember that the gauge is dependent on the outdoor temp, so if it's not set right you may under/over fill it. What is the norm for the ac compressor to cycle on/off? Mine seems to kick in for roughly 1-15 seconds, then off, then on again. The result is you don't get huge swings in pressure that could damage the system. Online shopping for Automotive from a great selection of Fan, Compressor, Clutch, Automotive Air Conditioning Relays & more at everyday low prices. Before charging you need to get small length of electrical wire and jumper the AC cycling switch (low pressure switch) which is located on top of the AC receiver drier. In this use, ANY motor oil is fine in the compressor. I recently purchased the car knowing the AC wasn't working. Get reliability information for the 2006 Ford Mustang from Consumer Reports, which combines extensive survey data and expert technical knowledge. This system uses a clutch cycling switch to activate and deactivate the compressor clutch according to system pressure. The best part is, our Ford Mustang A/C Compressor Job/Kit products start from as little as $8. AUTOMATIC CLIMATE CONTROL - Initially the compressor is on full, when it reaches the required temperature, it will reduce the amount of refrigerant being pumped through the system (there is no clutch plate to click on or off, it is internally regulated). Seems like there may be other issues to cause a compressor to cycle off. The AC compressor will normally cycle on and off while it's in use, depending on the demand for cool air. A car does this too. Noticed the compressor cycles. It may be your expansion valve. You will notice that with the car running and the AC off, the pulley ran by the belt will be spinning but the front hub will be stationary. When I have the AC on, the compressor seems to run continuously. Sometimes there can be worn or unmodified AC systems that function for years without a problem. Here is an example of a car compressor cycling on and off:. the bearings went out of the compressor so i replaced it with a brand new one and replaced the r134,now it is clicking off and on non stop as rapid as. The engine fans switched on and the compressor started. Look at the front of the compressor straight on, the pulley being turned by the belt. This happens when air conditioners turn on and off again frequently, often before your home has reached the temperature you have the thermostat set for. Short cycling, when the compressor constantly shuts on and off, is one of the most common air conditioning problems. If the compressor does not engage, directing air through the evaporator will not lower it's temperature. When the air is turned on with the MAX engaged, you can hear the compressor turning and and off right away. COMPRESSORS Table of Contents. Function of the ac compressor Cut-off switch in a vehicle. If you are experiencing problems in the physical operation of the unit (blower speeds, door operation, etc. Once the air. A compressor that frequently turns on and off might be a cause for concern. Remember that the gauge is dependent on the outdoor temp, so if it's not set right you may under/over fill it. Here are some of the more common types and causes of A/C compressor noise. After driving the car for anywhere between 10 and 45 minutes, the compressor clutch will engage and the air conditioner cools normally. [SOLVED] A/C compressor Cycling on/off. Smells Bad; Unlike the loud noises, bad smells are not a natural part of the air conditioner’s cooling process. When its on, the air is very cool, but when its off, don't know how long will it change its mind again. If you go out on a cool morning, it should cycle on and off more than it would on a hot humid day. Turn the air conditioning controls to MAX AC and start the engine. 6L Air Conditioner. If you take off the electrical connector, you will see a small screw inside. So it's it blows cold war. The compressor is supposed to cycle on and off. Quick Fix (workaround) Ford Fusion AC Evap. Using your low pressure manifold gauge, watch at what PSI the compressor shuts off. When the outside air temp is below 80 degrees, the AC seems to work ok. Most vehicles, the compressor is located at the lowest point of the engine. Setting it to “off” turns off the blower, causing the inside unit to freeze, which makes your entire AC system shut down. data stream on evap tempt. Just as a household air conditioner turns on and off as needed to maintain a consistent temperature, the AC system in a vehicle will turn on when the temperature in the passenger compartment rises, and turn off when it is cool. I am afraid its going to burn up my new compressor. I have the same problem Jon was having. A/C compressor doesn't cycle off. Read more Ford reviews to learn about other models. Air conditioning switched on itself at 3:18pm. When there is low pressure in the A/C system this switch is activated and does not allow the compressor to turn on and burn up. The only time the compressor stayed on before was if I left the fan on full speed, and even then it would cycle when driving on the highway, and I'd get periods of warm air that smelled like a warm refrigerator. I went back to the engine and noticed the compressor still engaged. THe purpose of the pressure switch is to monitor the compressor. Most vehicles, the compressor is located at the lowest point of the engine. 2) The Low-Pressure Cut-Out Switch is out of calibration (with R-134a, it should shut off the compressor at 19psig and with R-12 it should cut off the compressor at 25psig. 6L Air Conditioner. Hi, let me start off by saying that when in park the ac cools perfectly fine and the the compressor almost never cycles. Onto Google I went. Any pressure level below 25 psi can make the air compressor shut off. Symptoms of a Bad or Failing AC Clutch Cycling Switch. If you encounter difficulties in finding the Ford Mustang AC Compressor, call us and we will find it for you. Too much or too little refrigerant in your Air Conditioning system is a major cause of A/C compressor failure and it can also waste fuel. No Cooling Effect Suction Frost. The pressure switch in the 1989 Mustang GT turns off the A/C compressor when refrigerant pressure in the low pressure side of the A/C system drops below 30 psi. I finished the evaporator repair today. I just did an Efan conversion on my '02 Denali and now I notice my compressor cycles on and off constantly, with the a/c either on or off. Low airflow over the condensor could cause the compressor to cycle because of high head pressure. You may be so low on freon that the low pressure switch on the compressor is not allowing it to cycle. Both the Mustang air conditioning system and the Mustang heating system have numerous belts, hoses and pulleys that should be checked for damage, leaks or wear and tear. Once i got on the highway the clutch on the new compressor burnt up. This switch controls cycling of the clutch to prevent the system from freezing up. Too rapid or never cycling shows a problem - wrong refrigerant amount or a bad switch, maybe even a a puked compressor. Excessive gas will harm your system and will keep it from cooling properly. The air conditioning cooling cycle, which can be used without turning on the vehicles engine, uses a 24V DC power supply and because it runs purely off electricity or solar energy, it. Imagine that it's the heart in a human body - it's the component that keeps things running throughout the system, just like a heart keeps blood pumping and the entire body working. Your Ford Mustang air conditioning system is under very high pressure, but luckily it utilizes a clever fail-safe that prevents catastrophe. Cycling is part of the normal process through which your HVAC operates. The air conditioning system cycled on and off (not the clutch engaging and disengaging when the system is working normally, but the system powered off fully with the fans and compressor turning off and back on fully) as follows, with roughly 30 seconds between on and off cycles:. It's proven dependability is the heart of their RidePro compressor systems. This information is intended to give the average individual an average understanding of not only what each part is, but also how it functions within the system. Fast, same day shipping. Look for problems with your condensate drain line When your air conditioner works, it creates condensation, which is drained out of your home via a drain line. So the compressor appears to be running all of the time? The compressor get's it signal to cycle from the AC amplifier, and that has several inputs depending on the trim level as to when it should run (duty cycle). It's fairly common for someone to install a rebuilt or even new factory style compressor, (A5, A6, R4, RV2, York, Tecumseh, etc. You can check to see if it is cycling on and off properly by looking at the clutch faceplate in the middle of the compressor pulley. Doesn't seem to hurt anything I guess but I have to watch the temp gauge. If it is doing so rapidly, though, it can indicate an improper charge (such as being low on R-134a refrigerant). Just wondering if it's doing what it's supposed to. Read more Ford reviews to learn about other models. Your Mustang's air-conditioning compressor, which is an engine-driven pump, pressurizes the system. AC Compressor Clutch turns on and off - posted in Virtual Mechanic: Any ideas on why it would act this way? I filled it up to about 20psi and it was working ok but not quite cold enough (just cool). you would need to jump the a/c cycle switch. The compressor runs great and pressures are at right levels. Yes, if your compressor is low on oil, you need to check whether there are any filings in it or in the lines. Buy Heating, Air Conditioning & Components from AutoPartsWarehouse. Now that it's warmer, I've been using the AC, and I notice it does the same thing. long story short, compressor wont come on like its suppose to, i have my CCRM off and taken apart and i see a nice burnt section of the board and possible a relay. This continues as long as the clutch is engaged and the compressor is turning. Exterior Features; Bodyside/Cab Step or Running Board: Option; Bumper Step Up: Standard; Front Air Dam: N/A; Metallic Paint: Option; Power Sliding Side Van Door: N/A; Power Trunk. The pressure switch in the 1989 Mustang GT turns off the A/C compressor when refrigerant pressure in the low pressure side of the A/C system drops below 30 psi. For instance, if the R-134a level was low, the expansion valve might be fully open, yet the evaporator will never get frosty cold. 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. There is a pressure switch which detects that there is enough gas and if not the ac clutch won't engage. The compressor clutch is the electro-mechanical device that turns your AC compressor on and off. I'm probably taking to somewhere for diagnosis and repair soon because AC repair is out of my league. The best part is, our Ford Transit Connect A/C Clutch Cycle Switch products start from as little as $14. Jon Coleman’s 2003 Mustang is a legitimate 7 second car with all the equipment you would normally expect to see in a 7 second car… and air conditioning, and power steering, overdrive and hi-def stereo, of course!. This on and off of the compressor will continue until the problem is fixed. I would say if it was low enough that the compressor was short cycling or not cycling at all, you may need a few cans. I pulled the belt off and gave each a spin. Replied by quickNpainless on topic Compressor will not cycle OFF well the compressor cycles on when the pressure sensor on the high side of the system sends a signal that the pressure has dropped and the compressor needs to kick on to get the pressure back where it needs to be. The RPM your engine is turning, and the amount of cooling load on your air conditioning system will determine how often the compressor is engaged or disengaged. We hooked it up to our machine at work and found it only had a 1/2 pound of freon in it. If the cycles are very rapid the refrigerant level may be low, but the compressor is not designed to run full time when the AC is on. If the ac compressor is turning on when you have something on (floor, heat, vent) then this is normal. The compressor is turned off immediately when the A/C compressor pressure cutoff switch detects an acute increase in pressure. Before Removing the Compressor The fact that your Ford F150 AC compressor cycles on and off should encourage you to check a number of different parts before determining what the actual problem is. This information is intended to give the average individual an average understanding of not only what each part is, but also how it functions within the system. This car had been worked on previously by some other shop and had a new condenser and accumulator installed on the car. It blows continuous ice cold air. Using the controls on the dash, cycle the clutch ON and OFF at a rate of 10 to 15 times per minute for a total of 50 cycles minimum. This prevents freeze-up of the refrigerant in the accumulator/drier on the outlet side of the evaporator, resulting in the loss of cooling ability. My 1997 F150 4. This repair harness connector allows the A/C Clutch Cycling Switch to activated when there is low pressure detected in the system so that the compressor does not turn on and burn up. got the low and high side pressures right where they are suppose to be and put a new orfice tube in. Your Mustang's air-conditioning compressor, which is an engine-driven pump, pressurizes the system. When it come on it tries to cool but the compressor doesn't stay on long enough. lights, wipers, and diagrams. The fuses and relays are also OK. Imagine that it's the heart in a human body - it's the component that keeps things running throughout the system, just like a heart keeps blood pumping and the entire body working. Run the engine at 1,500 to 2,500 RPM. I replaced mine on my own, but only because I had the extra. If this is too frequent, is it a sign that I need to add refrigerant? Thanks for any help. Don’t mess around with this yourself. When I have the AC on, the compressor seems to run continuously. HVAC) running smoothly is extremely important to keeping you and your passengers comfortable in all types of weather conditions. The prius has a huge alternator/motor between the engine and transmission. When the compressor shuts off or you turn your car off the pressures in the system will equalize between the high and low side so the low side pressure will read much higher. I have a four door 97 Tahoe with only AC in the front. The proper amount of refrigerant in the system is very critical to A/C operation. Find New Air Conditioning Hose Assembly including liquid line, suction discharge line, accumulator hose assemblies at low prices. For instance, if the R-134a level was low, the expansion valve might be fully open, yet the evaporator will never get frosty cold. All of the Fuses are good. Symptoms of a Bad or Failing AC Clutch Cycling Switch. Both the Mustang air conditioning system and the Mustang heating system have numerous belts, hoses and pulleys that should be checked for damage, leaks or wear and tear. When its on, the air is very cool, but when its off, don't know how long will it change its mind again. Customer satisfaction is our number one priority. The ac compressor kicks on and then kicks off with in a few seconds. As the evaporator temperature reaches 30-32 degrees F, The temp sensor in the evap cycles the compressor off. For R134A, it should be adjusted to cycle the compressor at 21-22PSI. The compressor clutch is the electro-mechanical device that turns your AC compressor on and off. If your compressor is not cycling on, then you should seek the help of an A/C professional immediately. Replied by quickNpainless on topic Compressor will not cycle OFF well the compressor cycles on when the pressure sensor on the high side of the system sends a signal that the pressure has dropped and the compressor needs to kick on to get the pressure back where it needs to be. There are several possible causes as to why an air conditioner’s. This is what keeps the evap in the dash from turning into a block of ice. It is a high pitched whining noise that almost sounds like a supercharger, lol. If it were to freeze up it could sieze your compressor. This is really "topping off" an AC system, not "recharging". That's what was wrong with my roommate's Mustang. If this is too frequent, is it a sign that I need to add refrigerant? Thanks for any help. The AC cycling switch will prevent the compressor clutch from engaging if there is no pressure in the system. So I took it to the dealer and they changed the compressor to a new upgraded model under warranty (3 weeks ago) I started my car the other night and I noticed the compressor was coming on and off every 20 to 30 seconds, when the car was 1st started. It would always "surge" as the compressor engaged/disengaged, and his AC was hot. At idle with compressor clutch engaged, low=30, high=175 when reved up low drops to 20, high climbs toward 200 I waited for quite a while hoping the clutch would cycle off, but no luck. Ford Mustang V6 2005-2014: Why is My Car Vibrating? Why is My Car Vibrating? Good vibrations is a great song, but not something your car should have. The compressor acts as in input, allowing the PCM to sense the additional load and increase engine speed to compensate. This may not turn out to be true all the time, as the AC could have failed due to a fault in some other component. Finding the right compressor clutch for your Ford Mustang can help with an AC repair. Ive noticed that my car , when the AC compressor engages, usually after sitting overnight, and it moderate/high humidity emits this loud, high pitched whining noise when it engages. This is a discussion on [SOLVED] A/C compressor Cycling on/off within the Automotive Support forums, part of the Tech Support Forum category. Mechanic claims it is properly charged, but, it just doesn't get as cold as I think it should be. Before you can start recharging car air conditioning, it’s important to understand how it works. compressor also just stopped engaging. You have to add freon till theres enough to start the system. 2) The Low-Pressure Cut-Out Switch is out of calibration (with R-134a, it should shut off the compressor at 19psig and with R-12 it should cut off the compressor at 25psig. Tried bumping up the idle but it's way too fast if the AC compressor isn't running. I have a 1994 Ford Taurus 3. The reading on the gauge will probably be in the red when the compressor isn’t running. The RPM your engine is turning, and the amount of cooling load on your air conditioning system will determine how often the compressor is engaged or disengaged. Automotive Air-conditioning Compressor. When you are going down the road, the wind helps cool the compressor, but if idling, the compressor fan does the job. - Mon 5/31/12. Air conditioning switched on itself at 3:18pm. The compressor will continue to be on unless WOT is reached or the pressure cycling switch opens. That’s normal operation when the AC or the defroster is on. After the car sits for a while it might work again, might not. This small fan cools the compressor. The compressor will normally cycle on/off rapidly at first until the charge is increased, staying on longer as you come closer to a complete charge. It pressurizes the refrigerant and pumps it through the AC system. We checked the refrigerant and it is full. I recently went thru the new coil and clutch exercise and the air is blowing cold now, but I noticed the cycling of the system on/off (compressor and condenser fan both) during idle in hot weather with cold cabin. The fuses and relays are also OK. TOM: The other possible explanation has to do with the fact that the air conditioner's compressor cycles on and off continuously. No Cooling Effect Suction Frost. When the air is turned on with the MAX engaged, you can hear the compressor turning and and off right away. The air-conditioning compressor should last your bus’s life if you’re lucky. I just replaced the timing belt and now the AC compressor cycles on and off every few seconds. I checked the AC mode knob and selected "Off". This may not be it but When the AC compressor kicks in, there is increased drag on the engine (which turns the compressor), this can drop the RPMs and it may be that the car is reacting to that drop. What I noticed today when connecting my gauges to the system was that the reason why the compressor is cycling on and off is because the high side pressure is rising above 400psi. I turned the A/C off and stopped putting R-134a into it becuase the compressor cycling was almost causing the car to die from the load it was putting on the engine. The Perfect Fit ELITE™ 1968 Ford Mustang air conditioning system is engineered to actually fit a 1968 Mustang, not a single unit that is adapted to fit a whole product line like competitors. 8L V6 with. We filled it back up to the recommended 1. If the pressure drops below 2 lbs then the compressor clutch is disengaged. So make sure this power switch is in the “on” position. took my car in to be serviced for a/c today and the guy told me that I need a new compressor because the pressure was too high from the compressor on the high side? I noticed that my a/c isn't as cold during the 110 degree weather here, but when I'm driving at 40 mph + it seems ok or even when it cools off a little the a/c seems great. Look at the front of the compressor straight on, the pulley being turned by the belt. Automotive Air-conditioning Compressor. AC Compressor Pressure Readings and their Implications. Symptoms of a Bad or Failing AC Pressure Switch. If your air is blowing cool but not cold, the problem could be a clogged filter, cooling fan problem, radiator trouble, or it could simply be that you need to recharge your AC. I know that's to be expected. The system is fullycharged but car not cooling properly- I noticed the air conditioner compressor keeps clicking on and off every 5 seconds or so How do you know it has the proper charge? This is a sign of low refrigerant with the system cycling because it can't find the pressures it needs to work. The best part is, our Ford Expedition A/C Clutch Cycle Switch products start from as little as $11. Once i got on the highway the clutch on the new compressor burnt up. Third generation F-body cars are anywhere from 8 to 17 years old now, and that usually means your air conditioning system is either wasted or is going south. 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. 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. Before charging you need to get small length of electrical wire and jumper the AC cycling switch (low pressure switch) which is located on top of the AC receiver drier. I would welcome any ideas and suggestions. Many of us come to a conclusion that if the vehicle's AC fails to blow crisp, cool air, the cause is a malfunctioning AC Compressor. Of course this is in the 90 degree heat of Florida. Retrofit your Air Conditioning System to R-134a Background. Replaced it and the expansion valve/core and drier. Choose top quality brands Denso, Four Seasons, GPD, Spectra Premium, UAC. 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. I evacuated old freon and filled it with proper amount of freon and oil (as the pressure is right on). A common cause of the ac clutch not turning on is lack of refrigerant gas in the system. It is normal for the compressor to cycle so does your fan cycle with it? That might explain the bogging. This is done a lot in off-road vehicles. My air conditioner refuses to turn off. I believe it should shut off when in defrost mode when outside air gets cold, but I do not know if this is true. 71 2007 2007 Jaguar X Temperature Ac Heat Air Climate Control Unit Switch Defroster. Once the air. The heated gas moves back to the compressor where it liquifies again for another evaporation cycle. A re-built unit. smoke through the vents coming out of the side of the hood. The evaporator freezes up blocking air flow. According to the instructions, it should be between 35-45psi so I got another can. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. When it comes to your Ford Mustang, you want parts and products from only trusted brands. The best part is, our Ford Expedition A/C Clutch Cycle Switch products start from as little as $11. Both the Mustang air conditioning system and the Mustang heating system have numerous belts, hoses and pulleys that should be checked for damage, leaks or wear and tear. The compressor clutch cycles about 12 seconds on, and 12 seconds off. Can anyone help? In my 99 Suburban with the a/c system on, the compressor cycles on & off. First few days no problems. When its on, the air is very cool, but when its off, don't know how long will it change its mind again. now im looking for the schematic for it is anyone on here good at finding them cuz i really need some help on this on the label it has: Y94C84 XR3F-12B581-AC service P/n: XR3F. My air conditioner refuses to turn off. The problem is that my compressor runs constantly it never cycles off. Do I replace the relay, sensor or clutch? Any help is greatly appreciated. Hopefully I can get a closer look at it tomorrow. I assume, but don't wuote me because I don't own a Rogue, that the radiator fan is cycling on/off because the compressor is coming on and off. It makes sense to use an electric compressor in that car, because it allows them to not start the gasoline engine to run the AC when the car is stopped in traffic, it can just run off the battery. So I took it to the dealer and they changed the compressor to a new upgraded model under warranty (3 weeks ago) I started my car the other night and I noticed the compressor was coming on and off every 20 to 30 seconds, when the car was 1st started. I've NEVER had a seconds problem with the AC. This continues as long as the clutch is engaged and the compressor is turning. COMPRESSORS Table of Contents. The compressor is designed to cycle on and off. 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. The rest cycle reads much higher pressure, and you won't really be filled enough. UAC’s line of electrical components includes the Switches and Relays that are necessary for the proper function of an A/C System. ) we encourage you to refer to the wiring diagram located in. A/c doesn't barley get cold and it cycles on and off like it's low on freon but it's not nor is it over charged is the compressor going bad or relay or cluch Added (1). We checked the refrigerant and it is full. I went back to the engine and noticed the compressor still engaged. Cycling your AC compressor on and off like this unfortunately adds a lot of wear and tear. got the low and high side pressures right where they are suppose to be and put a new orfice tube in. I then jumped the AC relay to and noticed the clutch would cycle erratically despite being commanded on. After working on something else unrelated to the AC system I ran the engine and noticed the AC compressor was on. Download with Google Download with Facebook or download with email. One of the common uses of the York compressors is to be used as an on-board air compressor instead of it's original use as an ac compressor. The last step is to adjust the low-pressure switch at the accumulator tank. This on and off of the compressor will continue until the problem is fixed. ac not cooling but freon full and compressor working. The best part is, our Ford Expedition A/C Clutch Cycle Switch products start from as little as $11.