Ac Compressor Kicks On And Off At Idle

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. Engine idle, in gear, AC compressor kicks on and a repetitive "clacking" (or knocking) sound occurs, i. I noticed when I had the defrost on, the compressor would only run for a half an minute or so, then shut off, and kick back on. you don't. air conditioner compressor kicking in and out full freon only at idle When i am driving the car the ac works great. Keep advancing the blue knob to reduce this delay until the compressor kicks in just after the idle-up. Final Thoughts When an Air Conditioner Won’t Cool. I've read that the modern compressors are more effecient than the original units. The coldest parts of the system are the evaporator and suction line. 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. Start the car and let the idle stabilize in park at around 650-750 rpm. We have a lot of car air conditioning articles posted on the site that aim at getting your mobile cooling unit working again. If you don't evacuate, you'll have a bunch of air and moisture in the system. The engine has normal vibration during idle, but shakes a bit more as AC compressor kicks in. I know that when i switch ON the AC,the clutch at the compressor works. The compressor should engage a moment or two after the idle-up happens. First off I drive a dodge ram 1500 hemi sport recently i have found i'm only getting cold AC when i'm actually accelerating, I looked under the hood and found that when i'm just sitting idle the AC compressor kicks continually kicks on for a few seconds then kicks back off, also, around the AC accumulator there is a leak coming from where the hose goes into the accumulator but i don'. If it isn't working, you will get hot air when sitting still. If the system is low of refridgerant, when the pressure drops too low the compressor will kick off and the pressure on the low side will rise. The ac worked fine but the compressor was running continuously this is why I started the thread. A/C compressor not engaging. Slower than the TPS symptom. My AC doesn't make a lot of noise per se, but it definitely makes my rough idle even rougher when the compressor kicks on. But the Compressor goes off when needed. 7 L hemi - GMC 1996 Jimmy question. My ac does not work at idle. Puling the belt off won't "hurt" anything in the short term, but the AC compressor needs to circulate the refrigerant/lubricant combination. ac compressor turning on in defrost mode. Compressor Belt. The biggest problem is that the A/C doesn't work when I am parked or at idle speed. When my car ('04 Suzuki Aerio) is idle, the compressor cuts off and the AC blows hot. Close up and replace everything you took off to get at the A/C amplifier. It would not take. It is not managed by iFixit staff. As the internal units air temperature starts to rise the outdoor unit will start to kick in again. I wasn't gonna' run the A/C (engine off), just making sure the wires were doing what they were supposed to before I rewrap 'em. An awesome member of our community made this guide. The clutch is not engadeing when I turn the ac on. I have a 2006 Scion TC with 93,000 miles on it, just recently when you start it in the morning when its cold 30 degrees and you turn on the heater, the engine runs rough when the AC compressor kicks in, when you turn it off it runs fine, it runs some what better when it warms up. 1996 Honda Civic DX 4dr Sedan 140k miles When my car is sitting at idle and the air conditioner compressor kicks on and off, it causes the engine to almost stall and then the engine revs up and down. It's not the fact that your air conditioning system is cycling that is a problem, but the frequency that indicates problems. If the compressor clutch remains engaged, the likely culprit is the clutch relay. Any demand of more energy will make the engine revs up a bit. Thank you for answering. One of my fans run continuously,they both come on in high speed. My RPM's are at 750 at idle. I've had it for about a month now. Air-conditioning noises can indicate proper operation as well as an indication there's a problem developing or present. Dodge Cummins Diesel Forum > 2nd Gen. When I get home, (I'm in South Carolina now) I will run a test on how much the idle drops with the AC engaged. AC clutch kicks in and the motor stalls down and either stalls or gets low enough for the compressor to kick off and then revs back up to idle. Why does the fan stay on. Just cleaned the complete system, at furnace and outside. This is because special tools and knowledge are needed to successfully rebuild an AC compressor. When your AC turns on, it puts a load on the engine (the engine is responsible for turning the compressor, which builds pressure in the system, which allows low-pressure, gaseous refrigerant to be turned into high-pressure liquid and used in your cooling system. The ac light is on so I know the compressor should be on. How to deal with noise in the air conditioner compressor. This time we get to share some good news. I replaced both of my belts today and now my A/C Compressor kicks on and off when my A/C isn't even on It did that when I first got the truck but I recharged the A/C and it has blown cold ever since, this was over a year ago now that I recharged it. Initially, the pressure will spike and dip, as the compressor cycles on and off. Is there some kind of soleniod or switch that compensates for the AC compressor load that is not working?. 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). With the engine off, remove the serpentine belt from the AC compressor, pull the fuse, and spin the compressor pulley by hand. I did take the wire that goes to the little solenoid that speeds up the idle and touch the compressor wire and the clutch did kick in, so it's grounded and working, etc. – Timo Geusch Aug 30 '11 at 18:42 when the a/c turns on the IAC will open to keep the car at 900rpm. i couldn't hear any high pitched squealing and the AC compressor was replaced in late 08'. Get immediate access to battery information, efficiency status and run time calculator. What we recommend: Call an AC technician to find and fix the leak. After the AC cools the house back to 75 degrees, it will turn off again. I would welcome any ideas and suggestions. Sucked it down with a not great but useful vacuum attachment from Harbor Freight, got to around 29", so not super low. I'll have to play with it a little more, but I think if I reved the engine up just a few RPM, it would turn on, but I need to check that. Please always turn your air conditioner off during a storm. If this is too frequent, is it a sign that I need to add refrigerant? Thanks for any help. When the AC is off, the compressor clutch does not activate, meaning the AC is not straining the engine. So this time around we took it to get a. They produce less hp at idle. Then compressor starts again and all back to normal. Refrigerant will condense in any cold part of a system during the off cycle. You werent real clear what the problem was. I hooked up a tac to the vehicle. I do notice my V8 would rock when the compressor for the AC kicks on. I've been reading up on some AC fixes for when it begins to blow air and have knocked a few items off the list. You compressor could also be bad. the idle speed selector. The truck has been great up until 100,000 miles which happened last month. GFY's Xevin and VW_Jimbo!. If the coils are significantly dirty, the air conditioner will not be able to maintain the proper temperature, and the compressor will run continuously in an attempt to cool the room. any idea what may be causing this inconsistency to happen?. Most systems I've seen send pwr out from the switch to a pressure switch or refrigerant temp switch/evap coil sensor and from there to a relay and compressor. The IACV has three parts to it. My AC doesn't make a lot of noise per se, but it definitely makes my rough idle even rougher when the compressor kicks on. The air is cool but I'm wondering if it is cycling too frequently. Can't get the AC compressor to turn on after switching to Lyric T5 Thermostat. The idle stop solenoid on a/c and auto equiped cars is supposed to increase idle with the a/c on. It will happen after the truck is at operating temp in drive and park. I’ve had my truck for a year almost and noticed that the AC compressor kicks on and off about every 2-3 minutes when truck is idle. The ac still is not very cold when driving. I would idle the car at home with the A/C on and watch underhood to see if the cooling fan turns on every time the compressor engages, and if there are any unusual noises from either. It goes away as soon as you start to accelerate or turn off the ac. You werent real clear what the problem was. Listen for the click in the low side switch to turn the compressor on. MT is right. The rpm doesn't change. I start driving down the road and then it kicks in. It will happen when you turn the AC on as well. Just pull the clutch wire off the compressor to determine if it's the compressor load. Idle with compressor off is perfect, but: Compressor on and in park should be ~900. Most compressors have a low pressure control that acts as a safety switch by shutting off your compressor. Sometimes it wouldn't come back on until I thumped the low pressure cycle switch on the accumulator. When I'm driving then stop, the air slowly warms up until I start driving again. At the time I was worried that I didn't put enough oil in, but the mechanic said I'd be fine (I told him I put about 2 oz in) and that he'd add a little with the refrigerant. The pressure in the spool chamber keeps the boiling point of water below ambient temperature to prevent the absorption of water. It seems like the compressor is declutching, like I pushed the AC button off. Hi all, I figure since the 951/944 AC systems are pretty similar, I might have a better chance of someone explaining this to me on this forum. 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. An air conditioner's compressor controls the distribution of cold air throughout the house. I had a similar problem and it turned out that my condenser fan was not engaging. Air Conditioning blowing warm at idle When I first get into the truck and start it in the driveway I click on the a/c and it continues to blow warm air. When the compressor kicks on, the pressure on the low side is suppose to drop. Rotate the compressor clutch be hand to see if. Can cause highside pressure to go to high,making it kick ac clutch out. When you are going down the road, the wind helps cool the compressor, but if idling, the compressor fan does the job. That depends on the car. Big Cams drop more at idle with air conditioning on. This one's about my sister's '04 Malibu. Turn system On/ Off, set temperature and fan speed. Compressor should run about 60 seconds before shutting off! Top of dryer cannister should also have condensation forming on it , - and if fully charged it will "flash" frost just before it turns off! This is the big metal cannister standing right by the "heater plenum box" (it is about 2 1/2 incheds in dia. It's a classic sign of the air conditioner compressor fan going out. Basically as far as I know the AC all of a sudden began blowing warmer air. Maybe reset ECU? Let it re-adjust idle condition? I bought the car with the shortram air filter and maybe he didn't reset the car with that bolted on Its only when I have my AC on and I feel the AC compressor engaged. Took out the idle control valve and it was. Idle Surge) For those of you who may have missed the thread regarding my idle surge, here's a brief summary: - One hot Saturday in June, I was driving happily along the freeway. Normal operation of modern vehicles have the idle increase when the AC pump kicks on. I checked if the ac compressor was locked up but it spins freely and when the car is on I can see the compressor spinning. I first checked all of the fuses and all of them were fine. 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. If it isn't working, you will get hot air when sitting still. I feel your pain. If you want it to idle up when the compressor engages send the hot off the output side of said switch/sensor (not dash switch) to the MS for the input and then set the idle output with TS. How often should an AC compressor engage and disengage? At idle, mine will run, disengage for about 3 seconds, then engage again. if not then its the fan relay. But i wonder whats the relationship with the engine lagging?Does the compressor drains a lot of current from the battery?. Ac compressor kicks on and off. Solved! It's only when the AC compressor kicks on the engine goes to hell. For a list of common air conditioner problems and what to look for, check out our Energy Saver 101 infographic on home cooling. 75121501, bought 2007. If the freon level is not right, it will draw even more power than normal leading to a low idle like you claim. If radiator etc condenser is packed with alot of them big Texas bugs. Big Cams drop more at idle with air conditioning on. When the AC compressor cycles on the motor almost dies which causes the compressor to cycle off immediately. 1 on the high side, 1 on the low side. Sometimes the compressor does come on, runs for a minute or two and kicks off then in a minute or so comes back on and then off again. If this is too frequent, is it a sign that I need to add refrigerant? Thanks for any help. Contacting a professional technician for an inspection is the best step to take. After two days. We have a lot of car air conditioning articles posted on the site that aim at getting your mobile cooling unit working again. I'm not sure how it was before because I never paid attention but now the ac compressor kicks on and off every 10-15 seconds. PSI will depend on ambient temperature. They produce less hp at idle. So this time around we took it to get a. I've replaced the ac condenser, the radiator, ac compressor and belt (belt was a btch!). And you can hear the Ac compressor kicking on and off back and forth. An awesome member of our community made this guide. It does this to regain the power it needs to turn the ac compressor. 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. Basically as far as I know the AC all of a sudden began blowing warmer air. Multiple tune iterations later, while working on idle quality, at some point the AC compressor stopped working at low RPM/idle. At 126K I am hoping this is not a big issue. Final Thoughts When an Air Conditioner Won't Cool. 1) Never turn the car off with the AC on. 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 want it to idle up when the compressor engages send the hot off the output side of said switch/sensor (not dash switch) to the MS for the input and then set the idle output with TS. Common Sounds and Causes. So start your diagnosis by determining if the compressor clutch works. Turning the ac knob from AC to vent back to AC results in compressor kicking in for 2 seconds then off, 2 seconds then off. while at idle and i turns on ac when the compressor kicks in the engine dies - × We use cookies to help our site to work, to help us understand how it is used, and to tailor advertising on this and other sites. If the clutch doesn’t engage, the air conditioning compressor can’t pump refrigerant. Start Relays – As with the capacitor, the HVAC technician may try replacing the start relay, which is the only surefire way to determine whether it’s working right or not. Common Sounds and Causes. Any demand of more energy will make the engine revs up a bit. This is because special tools and knowledge are needed to successfully rebuild an AC compressor. The funny thing is, he said you DO feel it when the compressor kicks on and off, and that it's completely normal, but it shouldn't get to the point where it would stall. A "dip" would be a fluctuation. I have been able to get both to about 34 degrees on numerous cars and you really don't want to let the system go below 36 degrees because the evaporator can freeze. I thinking it might still be a tad low. Well after my 98 compressor completely destroyed itself I may just be paranoid but my 97 AC compressor was a tad loud when I got it last year and seems to me to be getting louder. Average repair cost is $800 at 48,100 miles. the compressor kicks in and starts to build up the pressure. It idles at around 450-500rpm making the compressor kick on and off. If the LPCS is turning off the compressor before it reaches the PSI point that you set it at, it needs to be replaced. GFY's Xevin and VW_Jimbo!. I noticed my A/C compressor stays engaged when I turn the A/C on. Luckily for me, it was just the compressor clutch coil. MT is right. My 96 s10 is pissin me off. My AC doesn't make a lot of noise per se, but it definitely makes my rough idle even rougher when the compressor kicks on. From what i have seen on other sites they say thats normal. The pressure is reading. I only notice it at idle and it is only noisy when the compressor kicks on. 1) Never turn the car off with the AC on. These days, most window air conditioner and room air conditioner in your homes or offices have electronic controllers in them that make the units more user friendly, intelligent and feature-rich. Air Conditioner cycles on and off. I would welcome any ideas and suggestions. Ford Fusion A/C Compressor Won't Turn On. About 45 seconds before you get to your destination, flip the AC off and put the regular fan on HI to blow out all the moisture. The AC's been working fine until this weekend. I guess the ECU is thinking the car is going to stall with AC and is kicking off and on the compressor. - Pontiac 2007 G6 question. 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). It is called the Idle Air Control valve or IAC for short. The AC Compressor replacement cost is minimal compared to the amount of comfort and solace that a nice cool can provide on a hot summer day. Just pull the clutch wire off the compressor to determine if it's the compressor load. To reset idle: On a warm engine, disconnect the battery for a minute. Also needs a new blower motor resistor since it only turns on in the 3, 4, and 5 settings. If the freon level is not right, it will draw even more power than normal leading to a low idle like you claim. When a modern, computer controlled fuel injected engine is at idle, the throttle plate is fully closed. 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. [Archive] A/C compressor kicks on and off at idle General. Dodge Cummins 98. Turn system On/ Off, set temperature and fan speed. My window ac won't stop when shut off. 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. I am also having problems with the AC on my 2006 Ford 500. 5-02 24V Forums > 98. It's a classic sign of the air conditioner compressor fan going out. At idle or if in slow moving traffic where the vechile speed is below about 20 mph the AC compressor cuts off. When you turn on the vehicle AC , engine triggers some elements, like air control motor or idle speed, so that idle compressor can be increased by compensating with extra drag. With the a/c on, your pressure should be around 40psi on the low side at idle. This can be from an over-oiled/over-charged A/C system or a failing compressor. I do notice my V8 would rock when the compressor for the AC kicks on. The compressor will then kick back on until the pressure drops again, and the cycle continues. With it on, idle flucuates wildly as the compressor kicks on and off. 1996 Honda Civic DX 4dr Sedan 140k miles When my car is sitting at idle and the air conditioner compressor kicks on and off, it causes the engine to almost stall and then the engine revs up and down. [Archive] A/C compressor kicks on and off at idle General. Since you have converted over to R134A, this should have been adjusted to 22PSI. When the compression kicks in, the idle goes to 850 without dopping, likes it's supposed I think. I am leaving tonight with no air conditioning to drive on vacation with my wife and 1 year old. while at idle and i turns on ac when the compressor kicks in the engine dies - × We use cookies to help our site to work, to help us understand how it is used, and to tailor advertising on this and other sites. Visit Future Nissan of Roseville in Roseville CA serving Sacramento, Elk Grove and Stockton #3N1CP5CU6KL564913. You werent real clear what the problem was. Puling the belt off won't "hurt" anything in the short term, but the AC compressor needs to circulate the refrigerant/lubricant combination. 1 illustrates, in simplified block diagrammatic form, an embodiment of an air conditioning system of particular applicability to an over-the-road or off-road commercial vehicle. Idle switch? I'll look into this. Maybe 20 or thirty minutes later the compressor kicks back on again. When it kicks on it runs louder than the engine at idle. At idle or if in slow moving traffic where the vechile speed is below about 20 mph the AC compressor cuts off. There is a temperature/pressure relationship. In the 6 months I've owned the burb, I have never heard the comp kick in, so I was excited when it kicked on. Last edited: just off it's stop when the engine is off, by. The compressor clutch kicks on and off randomly during the driving. Both the pulley and the clutch should be spinning. When the compressor kicks on you can usually hear a click and feel the engine struggle with the extra load. It would not take. I have a roof mounted ac unit on my RV. Because it functions in a continuous cycle on and off, it is subject to wear every time the AC is turned on. I've replaced the ac condenser, the radiator, ac compressor and belt (belt was a btch!). Recently I've noticed that when the car is idling when the AC kicks on, the engine idle will momentarily drop by about 250 rpm. AC Clutch is engaging at idle. It seemed to me that the Totally Integrated Power Module was protecting itself when enabling the AC clutch, I noticed this when I would turn my AC on and the compressor would kick in and out and after this the AC clutch wire blue with yellow stripe, did not show 12v anymore. i couldn't hear any high pitched squealing and the AC compressor was replaced in late 08'. New 2019 Nissan Kicks S 4D Sport Utility for sale - only $18,185. Solved! It's only when the AC compressor kicks on the engine goes to hell. Can someone with a working AC time the compressor cycling and let me know what you get? (From in the car you just need to listen to it clicking on and off. If the system is low of refridgerant, when the pressure drops too low the compressor will kick off and the pressure on the low side will rise. Thank you for answering. It could be making the noise at road speed but ambient noises might be drowning it out. Recently I had to get my engine coolant system and the thermostat system replaced due to a faulty system and while I was driving the car, it would constantly say AC off due to high engine temperate. Car makers use an electro-magnetic clutch to. most of the time the air is warm. I could always feel the AC compressor kick on and off. at first thought it was the a/c kicking in so i turned everything off and it still does it. The problem is that my compressor runs constantly it never cycles off. The air conditioning compressor keeps clicking on and off when running? 4 Answers. My car engine lags when i switch ON the AC. so I made a jumper plug so it would work. The AC compressor has to do work to compress the refrigerant so when it kicks in the load on the engine goes up just like when trying to climb an hill and the ECU needs to open the throttle to keep the engine speed up while the engine is doing work. Initially, the pressure will spike and dip, as the compressor cycles on and off. How to Troubleshoot a Surge Caused by Car Air Conditioning may be cutting the compressor on and off in rapid succession. Refrigerant will condense in any cold part of a system during the off cycle. The LPCS is set to turn off the system (compressor) when the low side reaches 25PSI. It increases idle so that when the AC clutch engages it doesn't bog down the motor. If the clutch doesn't engage, the air conditioning compressor can't pump refrigerant. Sometimes it would blow ice cold, 5 minutes later it be nothing but hot air. Long story short, air conditioner compressor noises are usually bad news. The compressor automatically shuts off when the idle drops. When its level goes lower than the acceptable level, you will face the issue of car air conditioner not blowing cold air when idling. When the A/C is on the compressor cycles on and off, (not sure how it all works, whether it is based on a temperature sensor or based on system pressure. I don't remember if this is normal behavior for gas car, I drove Prius for a year before going back to gas only car. The Freon gets used up with the running of the air conditioning. If you have a noise in the air conditioner compressor that has you stumped, or any other home comfort questions, contact the pros at. Can't say for certain, but it might be normal. For a couple years now the AC has been cycling on/off. The air valve to let pressure off heads for start up will pop off every 10 seconds until the compressor starts back up? _____ Let’s look at this issue. I don't want to keep adding more, what else should I do? The compressor will run for 2-3 seconds, then shutoff for about 20 seconds. SYMPTOM SUMMARY The air conditioning system is not cooling as expected. I ran it steadily for 2 days in 106+ degrees. It is called the Idle Air Control valve or IAC for short. Later I learned that the malibu has a V5 variable displacement compressor. I've replaced the ac condenser, the radiator, ac compressor and belt (belt was a btch!). Figured it was a tired old compressor so I replaced. the compressor kicks in and starts to build up the pressure. that is how it works. The clicking noise you hear is the air conditioner compressor clutch clicking the compressor on and off too quickly, this is called short cycling. If the AC compressor clutch won't engage on your late model Toyota and you find a B1479 Flow Control Circuit trouble code stored, the problem is usually a bad flow control sensor. If you want it to idle up when the compressor engages send the hot off the output side of said switch/sensor (not dash switch) to the MS for the input and then set the idle output with TS. Sometimes the compressor stop working for a few minutes. if pressure gets too high. The LPCS is set to turn off the system (compressor) when the low side reaches 25PSI. All of a sudden the compressor will not kick on. This will help reduce any musty smells building up 2) Whenever you want to turn the AC on, take the car out of gear and let the RPMs settle to 900 (idle). Set it high enough that when the compressor is on the car is still smooth and just don't worry about it. The air conditioning unit of my 2016 Honda Civic sedan failed to function normally after having worked profitably at the start of this summer season. So here's the story. the system needs to be evacuated and charged correctly. Air-conditioning noises can indicate proper operation as well as an indication there's a problem developing or present. When the compressor gets to a certain temp, the fan is supposed to kick in to high. My AC doesn't make a lot of noise per se, but it definitely makes my rough idle even rougher when the compressor kicks on. After two days. MT is right. I put the control head on AC MAX high. As you continue to add refrigerant, the pressure will eqaulize (providing you don't have a big a$$ leak somewhere). Since you have converted over to R134A, this should have been adjusted to 22PSI. You really shouldn't be messing with this. The AirCon can switch itself on and off intermitantly when you have a faulty resistor pack/thermostat, faulty track on your Accelerator position switch, faulty Hot-Cold control, faulty system pressure switches, compressor clutch, or associated relays and wiring. When I get home, (I'm in South Carolina now) I will run a test on how much the idle drops with the AC engaged. I am afraid its going to burn up my new compressor. If the system is full, then your compressor may be starting to go bad. You can hear the abnormal sound at the 1 second and 13 second mark. I know that when i switch ON the AC,the clutch at the compressor works. With the AC set to on and the engine running, the compressor should engage IF the terminal inside the connector is receiving +12V power via the 10-second delay relay behind the glove box. i googled it and only came up with the ac control panle going bad?and well yea at night mine doesnt light up with rest of gauges so i may try that. I had asked the dealership about the idle drop not to long after I bought it (new), but they said it was normal. just like it does when the fan is running. Dodge Cummins 98. The compressor clutch does not engage. Bad vibration at idle when AC compressor kicks in > There is a mechanism to kick the idle when the compressor load comes HTML code is Off. Can't say for certain, but it might be normal. Stuttering or on-off at startup: A "hard starting" compressor may stutter or begin to cycle-on then stop, then restart. I've found multiple forums with the problem of ac running at idle but warm and cools down when in motion m car is the opposite the ac runs great at idle but at speeds of somewhere between 30-45 ish the compressor shuts off And as soon as I slow down it comes on again but another thing I noticed is that my ac works reverse in being that with the. most of the time the air is warm. 5-02 Non-Powertrain > A/C compressor cycling on and off your AC will not funtion. I usually turn it off when coming to a stop because it is so loud. car not running. AC clutch kicks in and the motor stalls down and either stalls or gets low enough for the compressor to kick off and then revs back up to idle. Compressor should run about 60 seconds before shutting off! Top of dryer cannister should also have condensation forming on it , - and if fully charged it will "flash" frost just before it turns off! This is the big metal cannister standing right by the "heater plenum box" (it is about 2 1/2 incheds in dia. air conditioner compressor kicking in and out full freon only at idle When i am driving the car the ac works great. The whole car (esp. The AC Amplifier controls Idle up and turns on the AC Compressor. It increases idle so that when the AC clutch engages it doesn't bog down the motor. If this is too frequent, is it a sign that I need to add refrigerant? Thanks for any help.