He told me it was blasting cold air the whole way. Can the ac compressor still be working and it effect the ac condenser? I have a 2014 Subaru Forester. Actually, I remember reading that this is a gas saving "feature" that is done on purpose. The air coming out is still cold, but I can definitely feel when it cycles because the air gets cooler. Everything is working perfect, my only concern is that it should be cycling on and off so it does not burn out the compressor. The Idle Control Actuator is what controls the engine idle. " It's not overly loud, and it does not happen all the time with each time the AC compressor cycles on, but usually will happen somewhat regularly after the AC has been running for 15-20 minutes of traveling and the. I had to use a pry bar to move the belt tensioner to get the serp belt off, so I don't know if the tensioner is bad. Your AC doesn’t stop working most likely but it does lose much of its capacity. OK, I've attached a picture. The vent temp is a steady 40 deg F output. Having a good understanding of how the components work can help to explain the methods of repairs in the air conditioning system. Noticed the compressor cycles. I'm really hoping that this is a small issue as I don't have a grand to fork over on a new unit. The clutch seems to be cycling on and off too often, like every 30-45 seconds or so when idling, but I must admit I've never paid attention to it before, so I don't know what the normal cycles are. There is a good chance your AC compressor clutch Skip navigation Fixing car air conditioning that dies after a few minutes on hot days How Car Dealerships Rip You Off (The Truth. Now this year it has no AC at all. A manifold gauge set measures refrigerant pressures inside of an air conditioning system. On an 08 Camry the compressor runs continuously when the AC is on. Pickup a charging kit and (2) cans of R134 and DIY. There is no "set" run time. Is the compressor clutch cycling on and off? If the clutch is cycling on and off then I would say that you are low on freon. You can get this sequence: press the A/C switch. The air conditioner (A/C) cutout relay is designed to shut off the air conditioner compressor, by disengaging the A/C compressor clutch. the problem why my ac cuts off at idle is because my electric ac fan is not kicking on at all. I am also having problems with the AC on my 2006 Ford 500. Test pressure with the fan on high and the AC on MAX. An overcharged car AC system can start out pumping cold air. It’s possible that the “AC On” signal isn’t getting to your engine’s computer so you might try checking to see if the computer is receiving that input using a scan tool. Your watching for the center part to turn when AC is on and not turn when AC is off. Symptoms of a Bad or Failing AC Pressure Switch. The air conditioning compressor will turn off at the slightest rise of heat due to excessive HEAD PRESSURE - however the engine will not show any signs of overheating. It's worked perfectly since day one. 00 light bill. Then, it happened again, and again! The air conditioner compressor was rapidly cycling on and off. When the A/C is turned on, engine vacuum drops to 14" and the needle vibrates around that position whenever the compressor kicks in. When refrigerant is still in the compressor, it is considered to be at the beginning of the air conditioning cycle. Recently had my evap core fixed for a leak. Simply turning the unit off until the ice melts will restore its function. Even with the car parked for. The delay is supposed to prevent the air conditioner compressor from starting too soon causing your electrical breaker to trip. This Carrier AC features auto clean,high fan speed air circulation. But I would absolutely rule out the other things first. Then back on for another 15. There is a temperature/pressure relationship. Bad Car AC Compressor Symptoms. Make sure the compressor runs smooth, and there is no abnormal noise while it runs. Started on the 2nd 13oz can of refrigerant and now the compressor cycles on and off like a slow clock tick tock tick tock tick tock. I expected the compressor to cycle on when I turned the system on, but it didn't. A cycle switch is designed to shut the compressor off when internal pressure is too low. When it come on it tries to cool but the compressor doesn't stay on long enough. All of the parts have 12 months warranty. Discount auto parts, performance parts, & quality genuine replacement dealer parts for domestic and foreign cars. Over a certain number of years, this stress will wear down the compressor and cause it to eventually malfunction. The air conditioning/cooling process is one which, because of the thermodynamic considerations of the refrigeration cycle, has the added. I have an 03 Ranger Edge with a 4. Just now,my almost 2 years old advie is having a problem with the ac unit,malamig naman sya kaya lang minsan ayaw mag otomatik shut off compressor ,May time naman na gumagana ,di ba pag disengage compressor low idle sya,pag engage idle up?,ano kaya problem. The rate of the cycle and the time that the compressor is operating is dependent on the pressure in the low pressure refrigerant line between the evaporator and the accumulator/drier. Defeating the AC idle compensation on the BMW E34 M5: In order to get rid of the annoying surge when the AC cycles on/off in my car, I disconnected the feedback signal between the AC compressor clutch and the DME control. When the AC is off, the compressor clutch does not activate, meaning the AC is not straining the engine. the pressure is too high in an auto AC? The auto service place tells me that could be the reason the AC works intermittently. This will solve the problem. What are Normal A/C on / off cycle durations?. See all problems of the 2014 Chevrolet Impala. Why does the AC compressor keep cliking on and off even after you. So I'm having difficulty getting an accurate reading of pressure on the low side. 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. A clutch cycling switch is used to activate and deactivate the compressor clutch instead. When the car is idling and the A/C is turned the engine will shutter hard and/or turn off. It would kick the AC compressor off when it reached 31ish drop the pressure to about 29 then kick back on and cycle like that until I started driving again. It is natural for your car A/C compressor to cycle on and off. 38-40 degrees and compressor stayed engaged the whole time. I see Holley sells a fast idle solenoid that can be tied in with the compressor. 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. Here is a video of what its doing and any help would be amazing. The compressor isn't always on, and needs to turn on and off in order to keep your car's cabin at the temperature you set it to. To boost fuel economy, manufacturers are opting to cut off the AC compressor and slow idle at lights. Testing of the sensor will require the technical specifications of the thermistor for your model and a multi-meter. If your air conditioner was not sized properly for your home, it might be too. In the research, the compressor of the AAC is driven by an electric motor which in turn is operated by. If left without attention, short-cycling will cause damage to an AC’s components and may cause the compressor to burn out and require the system be replaced early. AC kicks on and off every 10 or 15 seconds on my Nissan Altima, and i've checked the freon pressure and it is good, so it is not low. We teach you how to change the air conditioning in your muscle car and have some helpful tech tips so that you can stay cool this summer. When the rpms go over 1200 the sound goes away. When I turn the car off and start it back up and don't turn the AC on at all, everything is 100%. He told me it was blasting cold air the whole way. This is an otherwise well running 1998 Taurus. before 2 weeks i showed 2 car ac tachnicians both told to change cont. When I turn the car off and start it back up and don't turn the AC on at all, everything is 100%. An air conditioner works by transforming a refrigerant compound from a gas to a liquid and back again in a continuous cycle. 00 light bill. I never hear my compressor when I'm at speed. From there, the gaseous refrigerant is squeezed into the condenser. Then turn on the AC. In this mode, it acts as a forward Rankine cycle heat engine, giving the engine extra power. The delay is supposed to prevent the air conditioner compressor from starting too soon causing your electrical breaker to trip. I tried jumping the cycle switch connector a while back with the A/C switch on in the car and still could not get the compressor to come on. It was for me! I was on the highway a few weeks ago, literally 5 miles from my exit when the traffic ground to a halt, all 3 lanes stopped. Once the air. It would squeak with ac on at idle and low speed and stop with no ac on. the idle will cycle up/down maybe 100RPM as the A/C cycles on/off. Short cycling can occur from the thermostat, electrical connections, circuit boards, and run capacitors. "clack clack clack clack. It is supposed to cycle on and off if it does it more regular then it is probably low on Freon due to a leak or some other problem not necessarily the compressor and it cannot be done at idle it has to be checked at about 1500 rpm's. It cycles about every 6 seconds. This symptom usually has three causes. This application note outlines various operating modes and the impact of user configurable setting on unit component behavior. My 1997 F150 4. My low-pressure line reads within the specs on the gauge as long as the compressor is running. 2000 Jeep Wrangler Compressor cycles on and off. The compressor is what takes the refrigerant (the gas) and pressurizes it, so it will absorb heat and cool the air. Check the air conditioner fuse and replace as necessary. and fan speed vary to maintain temp,but compressor stays on full time,does not cycle like. It does not cycle from on and off like normal. USB Mini Portable Air Conditioner - Air Conditioner for Room, Travel, Car, Camping - Mini Air Conditioner Hand - Personal Mini Air Cooler. I have a 1994 Ford Taurus 3. AC compressors endure a lot of stress. The air conditioning compressor will turn off at the slightest rise of heat due to excessive HEAD PRESSURE - however the engine will not show any signs of overheating. These are signs of a normal operating AC System. Since both parts are lacking air flow, both the A/C and engine are running hot. So this is where the problem stands. If the temperature in the evaporator is cool, the system will cycle off and on to maintain the proper temperature. It would squeak with ac on at idle and low speed and stop with no ac on. Your watching for the center part to turn when AC is on and not turn when AC is off. My car surges when idling with the AC on. “I’ve torn something in my groin,” he explained. So, the AC on my '96 850 doesn't work. The bellows will also expand, moving the electrical circuit to the compressor clutch, energizing it and bringing the compressor into operation again. I have an 03 Ranger Edge with a 4. This also happens after I drive for a bit the ac will go off and not come back on. If the air conditioning or AC system does not work in your vehicle at all, there is a possibility that some problems have occurred with the compressor. With the engine idling, turn off the AC and check that BOTH fans cycle on and off at low speed. It goes on/off on/off on/off in rapid sucession then clicks on and works fine. How I Fixed My Central Air Conditioning Without Injury Or Embarrasment The Symptoms The symptoms were pretty basic: the house was hot. Here's how to check the fans: Warm up engine with AC off. Plug AC adapter into line voltage If any noise can be heard from the AC adapter, replace it. Industry Industry. Thread starter matchgame90; It should run continuously even when the compressor cycles off. I'm really hoping that this is a small issue as I don't have a grand to fork over on a new unit. What causes air conditioner short cycling? Some of the most common causes of air conditioner short cycling include: An oversized air conditioner. ford forum at Car Dealer Forums; I need your opinions and advice. Air Conditioning Schematic Drawing Read/Download. This can mean a bad compressor, or a compressor falling out of spec. Now that it's warmer, I've been using the AC, and I notice it does the same thing. TO do this, you will have to evacuate the system - go to an AC place and have them evacuate any remaining r12. Thereafter, the vacuum remained at 20" until the next cycle. It's probably low on R134 gas and kicking the compressor off on low pressure. A/C Compressor stays constantly running--is not cycling on and off. Here are the steps I've taken so far. You can do it without even getting under the car or popping the. Less-common are adjustable-swash-plate compressors, which adjust their output without cycling. AC kicks on and off every 10 or 15 seconds on my Nissan Altima, and i've checked the freon pressure and it is good, so it is not low. The ac was not blowing cold air so I got some artic freeze so I started filling it and also compressor was cycling on and off every 30 seconds or maybe a little longer so I put some freon in it and it starts blowing cold air not real real cold but cold so I drive it to the store and then it quits blowing cold back to warm so then I add some more because I did not put that much in at first so. My AC in my home runs for about 10 minutes then cuts off for about 15 minutes and repeats that cycle during the day. car not running. My AC cools like it's suppose to and works fine when I leave the car idling. My range rover , bmw 's ect always cycle ON and OFF even at idle. If i let the car idle the compressor does not turn off at all and works perfect, but if i rev the engine higher or drive the car the ac compressor turns on and off but the system stays on. Has the A/C system ever been serviced? How many miles on the car?. 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. When its level goes lower than the acceptable level, you will face the issue of car air conditioner not blowing cold air when idling. i didn't no what it was till the next day i showed my friend and this time the ac compressor started to leak from the middle of the unit. they should both read the same psi as the ambient temperature +/- a couple of psi. No air coming from air conditioning vents. Now that I dropped the idle the a/c cycles on and off really fast. Compressor Belt The compressor is engine driven by a belt on the front of the crankshaft. Therefore this air conditioner is. In my car the noise is somewhat less but still noticeable at idle with a hot motor and the A/C turned off. The ac was not blowing cold air so I got some artic freeze so I started filling it and also compressor was cycling on and off every 30 seconds or maybe a little longer so I put some freon in it and it starts blowing cold air not real real cold but cold so I drive it to the store and then it quits blowing cold back to warm so then I add some more because I did not put that much in at first so. “I’ve torn something in my groin,” he explained. Shutting the ac stopped the noise completely. I have an 03 Ranger Edge with a 4. The compressor cycles erratically causing the engine rpm to fluctuate and jerk. air conditioner compressor kicking in and out full freon only at idle When i am driving the car the ac works great. Welcome to our store on eBay. Last weekend I came home to my car smoking on the right side. Dear all experience people, I have 2003 Lincoln Town Car, it's been good with me since I had it brand new but last month the AC had problem and I already try the best to fix it but the compressor is still not engaging, if I connect directly pin 1 and pin 5 of the relay then the compressor was engaging and AC cold but I can't stop the compressor until turn off the engine. Car Air-conditioning Compressor. Start the car and turn on the A/C as in the You Tube video. It did this pretty consistently every time I stopped, so I think "Great, must be the wiring harness TSB". What is an AC clutch compressor. However I have the distinct sound at idle with the AC on that seems to sound like a BB is tumbling around inside the compressor. The dealer called the GM tech people and GM knows about this problem and admit that sometimes a compressor replacement solves it but other times the noise remains even with a new compressor. It is when it cycles on and off every 2-3 seconds that you have low refrigerant or the low pressure switch is shot. I replaced the relay with no change. DISCHARGE GAS IN NEW COMPRESSOR FROM CHARGING VALVE BEFORE INSTALLING IT If the gas in the new compressor is not discharged first, compressor oil will spray out with gas when the plug is removed. Engine Turn Ac On, Rpms Drop 400 And Car Stalls. Then compressor starts again and all back to normal. At idle, there is a barely audible click then an very small increase in idle speed and a noise from the engine that lasts 4 or 5 seconds, then the click again, the noise goes away and idle speed goes back down. Is there some kind of soleniod or switch that compensates for the AC compressor load that is not working?. The cycle switch will cut the power to the air conditioner clutch. Your car should know when the air conditioning is one and increase the engine idle speed to compensate for the extra load of the compressor running. Even at 90F The A/C system/compressor was on (and it was hot in the interior for sure). They draw out all the freon using a machine with vacuum, after the freon is out the machine is still connected and the vacuum reading is monitored over a period of time to see if the vacuum holds. However there is the compressor cycling issue when the car is in drive but not in park. So did a little investigating into this. How much does Car surges when air conditioning is on Inspection cost? Get an estimate instantly. The ISC is most probably the cause of your stalling problem when the air conditioner is turned on. I just went thru a inspection of my car's AC and it only needed a small amount of freon after two years but the system is still weak in that at idle or stopped or stop and go traffic the system is not effective. HELP! I have a 98 Jetta TDI with AC problems. 224R cam, stock heads, 6 speed, 5. At idle when the AC cuts off there is a sudden increase followed by a rapid decrease in the idle speed. My way around this is to not use my AC and only turn it on while the car is moving, then turn it off when I come to a stop. DISCHARGE GAS IN NEW COMPRESSOR FROM CHARGING VALVE BEFORE INSTALLING IT If the gas in the new compressor is not discharged first, compressor oil will spray out with gas when the plug is removed. When its level goes lower than the acceptable level, you will face the issue of car air conditioner not blowing cold air when idling. 12v Dc Air Conditioner Compressor For Cars By Electric Motor Universal Type Electric Automotive Ac Compressor , Find Complete Details about 12v Dc Air Conditioner Compressor For Cars By Electric Motor Universal Type Electric Automotive Ac Compressor,12v Dc Air Conditioner Compressor For Cars,Compressor Electric Motor Universal Type,Compressor Electric Automotive Ac Compressor from Other Air. Run the engine at 3000 RPM until the fans (there are two) turn on to low speed. I see Holley sells a fast idle solenoid that can be tied in with the compressor. 1x volts while the car is running, this is. Voltage:DC-12V. The next to the last digit is 1 if the air conditioner was on (otherwise 0). they should both read the same psi as the ambient temperature +/- a couple of psi. Basically, it's constantly clicking on and off. I have scheduled to have my car dropped off in the morning to a. Operation of the system is as follows (assume that the car is not near WOT): If the fan is on, adequate pressure is present in the system (pressure cycling switch is closed), and either a/c or defrost is selected, the point "to ecm" is drawn close to ground. Plug AC adapter into line voltage If any noise can be heard from the AC adapter, replace it. Air conditioners consist of four basic mechanical parts: a compressor. any idea what may be causing this inconsistency to happen?. Your definitive guide to Car surges when air conditioning is on Inspection. My AC cools like it's suppose to and works fine when I leave the car idling. After you get to highway speed, it would level out and AC cools. The cycle switch will cut the power to the air conditioner clutch. It is mounted in the low pressure side of the AC system and its purpose is to detect the flow of refrigerant in the system by measuring the pressure. Especially during hot humid summer days. They air does get cold, but then the compressor kicks off and the air warms up, and then it kicks back on again. Is this normal?really expected the Sanden to cycle smooth like a modern car. 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. Then back on for another 15. When car is started and all ac is off, the ac clutch kicks on after a second or 2. On 2 it has a good balance of cold air and movement, but still cycles on and off. If the contactor has proper low voltage applied to the coil and it does not pull in, it is a bad contactor. Correction on a typo from my previous post today. At idle, there is a barely audible click then an very small increase in idle speed and a noise from the engine that lasts 4 or 5 seconds, then the click again, the noise goes away and idle speed goes back down. The compressor also has an electrically-operated clutch that turns the compressor on and off as you demand more or less cool air. Cooling, Heating, Ventilation & A/C - Should A/C compressor cycle on and off? - I know my A/C system has a slow leak somewhere, since I have to add a can of freon to it once or twice a season. The system was checked and no leaks present from dye. After the car is shut off for a while the ac works but then will go off again. The compressor cycles on for 15 seconds then off for 15 seconds. TO do this, you will have to evacuate the system - go to an AC place and have them evacuate any remaining r12. Thanks for any help you can give! Vehicle is 2006 Toyota Sienna. At the same time engine rpm drops to normal idle rpm. I hooked the A/C gauge to the car and it is reading 60 to 70 psi which is into the red on this gauge. You need to check the pressure at the low side and see if it drop below 20psi at idle. It keeps turning off and on in repeated short cycles. Especially during hot humid summer days. Does anyone have any experience with these? It seems the compressor shuts off at higher rpms but it continues to cycle. I was stuck in traffic so I was able to turn the car off and then back on, so I did - but that did not help. The whole car (esp. 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. My 2012 Honda Accord V6 AC compressor was cycling on and off every 6 seconds which seemed like a lot but blew ice cold air. inverter acs have the technology where the rpm of the compressor decreases when it reaches the desired temperature (just like driving in the eco mode at say 60-70) but not in our car acs. It is at 30psi @ 85 degrees out at idle and it indeed cool and doesnt leak but the ac compressor turns on and off every 10-25 seconds. Both cooling fans start when A/C is engaged and the compressor clutch kicks in. 14 Answers. Replied by Bucky on topic Air conditioner Compressor Cycles ON/OFF This car has had a low idle RPM problem for some time that no one seems to be able to diagnose. This hybrid compressor has about 85% of its refrigerant cycling through the belt driven portion of the compressor and the electric drive has its own scroll and delivers the remaining 15%. The only way the clutch dis-engages is if I press the AC button on the dash off. Welcome to our store on eBay. When car is started and all ac is off, the ac clutch kicks on after a second or 2. 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. The PCM maintains two idle trim settings. I've replaced the ac condenser, the radiator, ac compressor and belt (belt was a btch!). Air conditioner compressor won't cycle - stays on permanently. Collection of free car service manuals Car service manuals Armada 2007-2013 Nissan Sentra (B13) 1991-1994 A/C Compressor Oil Checking. Supplier offers new, replacement, aftermarket and Remanufactured (not just Refurbished) air conditioning parts directly to the public at wholesale price. Before making any final decisions, you need to perform a little troubleshooting […]. Correction on a typo from my previous post today. Highest Quality Parts, Lowest Prices. So did a little investigating into this. You most likely have an AC compressor that is cycling on and off to often, this causes the RPMs at idle to fluctuate. An auto AC has two limiting factors when the car is at idle. I read here the valve for the 3. Please help! I am having trouble with my ac compressor. Although the compressor had been cycling even when the ambient temp was about 75F the last few days, I went out to the car a few minutes ago in an attempt to answer @asemaster 's questions. When there's a problem with the compressor clutch, your air conditioner won't blow cool air for long. (maybe) There is a pressure sensor that when it sees low pressure in the AC system turns the whole system off to protect it from damage. BMW AC compressor pumps the refrigerant to make it flow in a closed loop throughout the air conditioning system. I think the system is near fully charged. If O–rings and/or seals for R1 2 air conditioning sys– tems are used by mistake in the. Onto Google I went. Your low on freeon, when the A/C compressor is running the PCM raises the idle, normally the PCM can adjust and keep the idle smooth, but when the A/C is short cycling due to a low freeon condition it cycles so rapidly that the PCM can not adjust the idle fast enough and you end up with the idle goign up and down. AC on and AC off. Take the car out to the freeway and get up to speed it will blow cold air. The refrigerant compressor of a motor vehicle air conditioning system in which the compressor is normally cycled on and off according to cooling demand is maintained continuously on or continuously off during idle operation according to a measure of the compressor duty cycle. 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. Only way to get the compressor to shut off is to manually press either of two air flow buttons, one which directs air to the upper dash outlets only or the second to direct air to the floor only. Other times it seems to work just fine. Is the late 944 compressor really supposed to cycle? If so should it be bouncing off the low or high pressure limit or both? Or the freeze protection? I've only read the 928 AC manual (same type of expansion valve system, same compressor) but do not recall it mentioning cycling. So I don't know why it cycles instead of. Similar to the home units, if an automotive air conditioning compressor is operated when outside temperatures are below about 60-dedgrees, ice can build up on the coils, which renders the units ability to cool the inside air ineffective. The AC switch is to disable it, and the AC (while operating) efficiency method is to cycle the compressor on and off. When idle and AC is on, the car rumbles about every 10 seconds but doesn't when AC is off. Inflating a tire using an air compressor is remarkably straightforward. A compressor serves as the heart of an air conditioning system. Similar to many other car parts, the compressor can wear out over time. When the car is idling and the A/C is turned the engine will shutter hard and/or turn off. For efficient air conditioner short cycling troubleshooting, read on to discover more about the causes and what you can do about them. The pressure is up at ~90 when the compressor is off. Vent temp about 40F with recirc on. See all problems of the 2014 Chevrolet Impala. Compressor oil level IOW. This essential component enables the AC unit to heat and cool your home by pumping refrigerant through the vapor-compression cycle. Why the heck is my compressor turning on and off, and on and off, and on and off?! Sometimes an air compressor will turn on and off rapidly in an unending fashion, this is an occurrence known as short cycling. It's worked perfectly since day one. any idea what may be causing this inconsistency to happen?. However, adding refrigerant isn’t always the solution for car air conditioning problems – troubleshooting may be required before just charging a car AC system. AC compressors endure a lot of stress. If there is no clicking on and off by the. When the AC is on, the compressor clutch activates, wherein the drive belt on the engine now turns the compressor which in turn is compressing refrigerant so you can be nice and cold. Thanks in advance!. The rate of the cycle and the time that the compressor is operating is dependent on the pressure in the low pressure refrigerant line between the evaporator and the accumulator/drier. When I have the AC on and am idling (foot not on the gas at all) the engine is revving itself up and down. These include the air conditioner clutch assembly, heat exchanger, compressor, drive belts, and pumps. I had the car in the dealer once already and they could not find a problem and this time I called. Saw that the lines were freezing up. AC compressors endure a lot of stress. If i give it a little gas (hold idle speed up) it will cycle on and off normally. For those familiar, the stock holley had a selenoid connected to it to raise the idle when it is on. Now that it's warmer, I've been using the AC, and I notice it does the same thing. The compressor isn't always on, and needs to turn on and off in order to keep your car's cabin at the temperature you set it to. I know they cycle repeatedly but this is too fast to cool. I put less R-134a in the system this time 2. Cheap clip connector, Buy Quality clip tool directly from China clip car Suppliers: New 12MM High Quality Car Auto Brass Open Flow Lock-on Car Tyre Inflator Tool Valve Connector Air Chuck Inflator Pump Valve Clip Clamp Internal Thread Conventional car compressor Connector Adapter Enjoy Free Shipping Worldwide! Limited Time Sale Easy Return. Before making any final decisions, you need to perform a little troubleshooting […]. 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. enabled=1 zswap. The problem is that the air compressor cycles on and off. The clicking noise you hear is the air conditioner compressor clutch clicking the compressor on and off too quickly, this is called short cycling. An overcharged car AC system can start out pumping cold air. Is your air conditioner continually shutting off? This is called short cycling and it is a common problem. 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. Low was around 20's High was in 350's. The mechanic just called and said that after the recharge, the engine would surge and then fall to idle, surge and fall, in a cycle. Anyone else who has a SDL that can tell me whether their A/C compressor runs continuously when AC is selected on the CCU (or cycles on/off)? #. It didn't even turn on before. The Compressor cycles on & off to charge the system pressure as required. extra flow of air during warm weather, or for times when the car has to idle for a long time. Sounds like the idle needs to be set. My cycles are alot longer than that, I would say the compressor stays on for 45 seconds to a minute, cycles off awhile, then cycles back on again. I can get the scary noise to reproduce, but under the OPPOSITE of previous conditions. The pressures look normal at that condition, at about 250 and 48 psi and cooling. With my windows closed and the temperature set to something reasonably easy to obtain, such as 25 degrees, the compressor just keeps running. If your car’s air-conditioning system blows only warm air on hot days. Could that be because it was quickly hitting over-pressure, turning off, and then trying again in rapid succession? We've had the car for almost 8 years and haven't touched the AC. Discount auto parts, performance parts, & quality genuine replacement dealer parts for domestic and foreign cars. Check the air conditioner fuse and replace as necessary. Since car air conditioning systems get turned on and off constantly, this power fluctuation puts a lot of stress on the compressor. In some cars, the compressor is also utilized to offer heat and ventilation, both of which tend to be used primarily between late fall and early spring.