After taking some out, the compressor stopped kicking on and off – and the high pressure then stayed fairly stable between 325 and 350 psi. It worked! This is part of the programming that is built into the electronic system that takes all extra systems that might rob power from an engine under acceleration and redirects it to the engine itself. With recirculating the air and the outside temperature around 80 degrees, the car was putting out about 44 degree air from the A/C vents. This saved me so much time, money and headache. Probably you have the fix by now but maybe someone else….? This is controlled by the turn on and off switch of the air conditioner in the dashboard near the driver and passenger. Get a great deal on a quality A/C Clutch kit.A/C Clutch Kit.A/C Compressor Clutch Kits include the compressor clutch, which engages and disengages the compressor when the A/C is switched ON and Off, and other related components. 2010 Chevy Cobalt & my ac was cool but not cold. It appears that it too was overcharged as the a/c boys are here today. Thanks so much for saving me an embarrassing trip to the AC guy! In this article, you will learn what you can do during such a situation. Discussion Starter • #1 • Sep 9, 2013. good information ,exact same thing happened to me. I do not have any gauge to check it. I then got my temp prob out and found the temp to 55.3F. The cycling continued so he started looking into possible causes. The ac was barely blowing cold air before the recharge and now it blows none. All is well but what the heck happened? I think I overcharged my system but only have the means to remove the coolant from the low pressure side? If the ac compressor is turning on when you have something on (floor, heat, vent) then this is normal. I bought one of those low-pressure gauages for about $15 and a can of R-134a refrigerant with stop-leak in it. If anyone is looking for the gauge set I used, it’s available from most of your big name chain parts stores. In most modern cars, the compressor’s clutch relay is turned off and on by the low-pressure and high-pressure switches, and the compressor’ oil level through the fuse. We weren’t sure what it was and went on about the day. After all, we aren’t factories and such. it hit 350 – then 375 – then 400 – then just shortly after, the compressor popped and shut off. Check your car’s workshop manual to find out if your AC system is connected to the WOT switch or to any other protection system that is connected to the compressor clutch. The OP is the best I’ve seen for person-splaining conditions and ramifications for vehicular AC compromisation. The compressor clutch consists of a pulley, pressure plate, an electromagnetic coil. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. When low-side pressure decreases to about 25 psi, the pressure cycling switch opens the clutch�s coil circuit to disengage it. The air conditioner compressor was rapidly cycling on and off. After reading your write up and some of the responses you got, I released A/C pressure until the unit quit cycling on and off. Good and organized post, I noticed also if there is a low charge of gas, it will the same rapid cycling and I think this happens to avoid the compressor from being damaged.Thank you for sharing your post. Vented the refrigerant and the problem seemed to go away. S, now, when I finish my work today, I will try to find service to check the right amount of the gas. Thanks! A huge thank you to bsntech, this post saved my butt! Short cycling, when the compressor constantly shuts on and off, is one of the most common air conditioning problems. The last few days my compressor kicks on & off every 5 secs or so. You saved me from taking it to the shop for diagnostic. Dreading what I’d find I began to research the issue and stumbled on this article. Then, I attempted to turn on the air conditioner on in the car last week and again – very bad squelching noise coming from the car when the AC was on. I’ve got the same thing going on with my car and come to the same conclusions of undercharging or overcharging so I’ll hit some R134 and it works okay for a little while but for some reason the pressure will build back up over time and I have to repeat those steps, Do you bleed it from the Low port (while running the car) or the HIGH port (when the car is turned off?). So we hooked the hoses up and the high pressure climbed very rapidly when turing the A/C on. As expected – the high pressure was too high. So, the car only needed a bit more than 1/2 a container of 12-ounce freon and it was working like a champ! If the compressor clutch is not engaging, there are many possibilities. My question is how do i go about bleeding it, does the engine need to be on or off, high side or low side? It is normal for a vehicles system to cycle the compressor to prevent the internal pressure from exceeding certain maximum pressures within the system. You are now able to diagnose the symptoms of bad AC compressor and understand the replacement cost. I have. But, he did tell me that my AC was cycling on and off and it needed to be charged. Lockout on Clutch Sensors: Most modern cars have their AC clutches turned ON and OFF using high pressure, low-pressure switches, and level of the compressor oil. BTW. These three conditions will disable the clutch to engage the compressor if it senses that the compressor is low inrefrigerant, has excess in refrigerant or the compressor has insufficient oil. That was the problem – it was simply over-filled. Those cheap low-pressure testers that come with the charge kits only tell you part of the story. Thank you, it worked like a champ on my 2004 Grand Cherokee. on off…every 5-7 second. You can do whatever you want with the blower switch and it will NOT affect how the AC compressor clutch engages. I've verified this by connecting the two wires together and visually confirming that the clutch does operate. Bled it off, and it seemed to be ok, then took it to the dealer, they drained, refilled with the “correct amount” saying it was a little low, but now it’s cycling and pulling again, enough to be annoying (plus there’s an annoying rattle between 2000-2500 rpm). Problem fixed – no more squeek! After reading this last night while searching for solutions on my ’07 Civic, I went out today and bought an inexpensive gauge set at a local auto parts store, and low and behold, my high side was reading in the mid-400 psi range. Then it would pop and kick on again. Then, when your compressor is off, the pressure will rise again and it will turn back on. Expel the Freon on the low pressure side – same side you use to fill it. I said – “Is it because I overfilled it?”  He agreed and thought that I may have overfilled it – but said he hasn’t ever noticed a car doing that before. Thanks for the info and confirmation . 5. A pressure cycling switch is electrically connected in series with the compressor electromagnetic clutch. Here’s the link: http://www.oreillyauto.com/site/c/detail/INT0/MF5.oap. Cars… Can’t live with or without ’em, I think it must have been a scrivenors error. Thank you, my 2005 Nissan Sentra is now cycling correctly after letting some freon out. Thank you so much, you saved me a ton of money with this fix! That power is what makes it possible for your AC system to start running so that it can cool the interior of your car off in a hurry. I have a 2005 Honda Pilot. My RPMS also fluctuate while idle when as the compressor is cycling on and off, my AC seemed to be cooler prior to the R 134 being added. I only took out a lil bit at a time so is that a bad compressor?? i have an 05′ ford & i did the “do it yourself” freon thing & had the same thing happen & was dreading a $1k fix..thanks so much for posting.. Had a new trane unit installed in my house. OK I knew, something is with AC. Unusual cycles, such as when the compressor runs for a long time without stopping, shuts down briefly, then runs again for a long time, call for air conditioner repair. Cautiously optimistic I went back out to the garage, started the car, reattached the gauge apparatus, and began to bleed out the system. Ford Fiesta 1.4 16v Year 2008 I added a reply to you but not in the proper spot. Additionally, just as a precaution, never connect the high-side gauge with the compressor running, you can damage the system, and if you need to bleed off some of the refrigerant, only do so from the low side. My 2005 Mazda 6 was having this cycling issue. AWESOME AWESOME AWESOME THANK YOU! I did the same thing and couldn’t understand what the problem was until I read this. Turns out there is a second belt – an accessory belt – that controls the A/C compressor. Compressor Failure. View attachment 2666241 “Great,” I thought,”I just killed my AC at the beginning of June!” I went for a test drive and sure enough, the AC was not cold at all. Her AC was working fine. The A/C shop said unplugging the unit would be ok, but they do not have to grovel around under the car drilling out seized under tray fixings etc to get to it. If you get that the air conditioning (AC) compressor clutch is not engaging in your car, you might need to get some answers. Your A/C compressor clutch is one of the most important parts of a vehicle’s air conditioning system. after three weeks of frustration trying to figure my system out ,I happened across this post and bingo. So, down to the local automotive store. Same deal, I overcharged mine following directions on the gauge kit and it started cycling the compressor on and off every few seconds. If one of these three aspects has defected, then the clutch will never be engaged. Sure enough, he said that the low pressure was being sucked down to about 20 PSI and the high-pressure was kicking way up again past 400 PSI. I was afraid I overfilled it – because the car was originally trying to cool before putting any R-134a into it. Prove it. That is exactly what I was experiencing kick off on the high line air in the system bled it a little rpm it to 2700 noticed kicking stopped after several tries added compressor oil easy on the freon134a noticed air in the system than bled it a little until system was operating normal . Sum Up. Found your article and it saved me $$$. The compressor was still clicking on-and-off so I kept bleeding the line until the compressor kicked on one last time and stayed on! My car has 167000 miles. We’re just a meagar few backyard mechanics. They said with the new freon they use now, repair folks are prone to overcharge the units. The clutch is controlled by the A/C button, not by the blower switch. Can the freon be expelled from any side? I believe now its over filled. This creates a short cycle that causes massive amounts of wear and tear on your AC system, potentially resulting in parts going bad or system failure. This is an otherwise well running 1998 Taurus. . I was wonderig why my compressor kept cycling. I knew I was running a little low, and ended up adding almost a whole can. Stand in front of the AC compressor at the front of the engine. What is the best method for bleeding off some excess high pressure / freon ? During drive time from dealer to home 70km, I was feeling the engine is getting less power randomly. Want to get an estimate or have questions about our services? When there’s a problem with the compressor clutch, … Thank you for posting your comment. Ran find for couple of months til temp got to above hundred here in Texas. The weird thing is that every time the A/C clutch kicked on the radiator cooling fans would turn on. My AC is always spending even if the AC is off does the AC always going to be running because I never had a clutch engage is this supposed to work that way with the AC compressor always running can you please give me a little bit inside on what's really going on because that the air is not circulating would be cold . At idle with little airflow, the high pressure coolant isn’t getting cooled so it shuts off, but at highway speed, the added airflow cools the high side and it works fine. FREE Shipping on orders over $25 shipped by Amazon. I'm trying to understand the operation of the AC system on my car so I can bring it back to life. Bleeding some pressure from the high end did the trick. Thanks I think my Dodge Ram 2500 Diesel is got this exact issue. I expellef some refrigerant and the compressor worked normally again. You can rent one at Auto Zone free. I remove some freon and it stops but it also looses all its cold ait. My AC was recharged on my 09 Accord and the air stopped blowing cold as well as the compressor started cycling on and off repeatedly. Maybe i've got an idle/crankshaft sensor problem and the AC compressor is trying to tell me that. Again, this is normal operation.If you do find that your car’s air conditioner compressor i… When I took the car, the cold air was coming. If it does not, shut the engine off and disconnect the negative battery cable with a socket. You should never guess with refrigerant, you should have evacuated the system from the beginnng, and then weighed in the correct amount. Called up my mechanic and he basically told me the same thing – he said that if the compressor was rapidly turning on and off, it was because it was undercharged. Thank you! There is a fine line between undercharged and overcharged in a vehicle a/c unit that only holds 28 oz. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. Then began cycling on and off, run for about 10 secs or so, then shut off, then back on. Low side system pressure is regulated by the cycling of the compressor to prevent evaporator freeze up. I was afraid I was going to have to replace the compressor in my daughters car… Came across your post & bled off some pressure on the high pressure side & bingo! 8MILELAKE Air Compressor Clutch Rebuild Removal Tool Kit AC Clutch Puller Auto Air Conditioning Remover Installer fit for GM, fit for Ford, fit for Chrysler. When the A/C is activated, the compressor clutch transfers power from the engine’s crankshaft to the pulley mounted on the A/C compressor. 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And the compressor body to engage and disengage and will leave the clutch should be on label... Turn the air ac compressor clutch on and off compressor was still clicking on-and-off so I added a reply to you all here out....

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