My question is how do i go about bleeding it, does the engine need to be on or off, high side or low side? 99. Once I did that the gauge was dead in the middle right where it should be! During drive time from dealer to home 70km, I was feeling the engine is getting less power randomly. A pressure cycling switch is electrically connected in series with the compressor electromagnetic clutch. He got that replaced and also replaced the serpentine belt while he was at it. A quick lap around the neighborhood confirmed the fix with higher RPMs! The ac was barely blowing cold air before the recharge and now it blows none. 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. Originally, anytime it was very cold out or was raining/wet, I would hear a nasty squelching noise coming from the car. Why? S, now, when I finish my work today, I will try to find service to check the right amount of the gas. I thought for sure I’d be shelling out a hefty sum to replace the compressor. You saved me from taking it to the shop for diagnostic. After I replaced a filter that was long overdue, my worry continued to grow. As deal, I requested the seller to check the gas system, and they did it. Thank you again for sharing! I only intend on bleeding off a small amount to see if it will help! The cheap gauge showed that I was on the low end of operating pressure, so I decided to add a bit more, then the compressor began rapidly cycling, and when it was engaged the engine was almost stalling at idle. Then, it happened again, and again! Short cycling, when the compressor constantly shuts on and off, is one of the most common air conditioning problems. Thanks a ton, I will post results back to you all here. So, back to the hoses. We will see, as this is just the first day and the a/c boys are still here. Thanks! Maybe i've got an idle/crankshaft sensor problem and the AC compressor is trying to tell me that. The Honda Civics can hold up to 22 ounces of R-134a in them. It is normal for a vehicles system to cycle the compressor to prevent the internal pressure from exceeding certain maximum pressures within the system. Well, I checked the static pressure after the car sat for a bit and the reading was over 100 psi – note that this is on the low-pressure side. 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 . Thanks buddy! Here’s the link: http://www.oreillyauto.com/site/c/detail/INT0/MF5.oap. Reply. In many models, the relays come inside a “relay box” that is responsible for turning the engine cooler fans on and off, controlling the compressor clutch, reading the pressure switches signals, etc. Everywhere I turned, people said that if the compressor was cycling on and off quickly, that meant the compressor was low on freon. The cycling continued so he started looking into possible causes. When I took the car, the cold air was coming. We weren’t sure what it was and went on about the day. Simple answer is yes. Got home and began to slowly put the R-134a into the car air conditioner system with the AC turned on and the temperature set fully to cold and the blower fully on. Burnt Fuse/Bad Relay. 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. I am now thinking the compressor coils need to be cleaned. 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 added freon, then going down the road it would cycle and pull the engine down very hard. Stand in front of the AC compressor at the front of the engine. This saved me so much time, money and headache. I am having similar problem with my 2000 Avalon, and would like some specific help. Thanks so much for saving me an embarrassing trip to the AC guy! If the compressor clutch is damaged, it keeps the air conditioning system on or off permanently. Cans of Freon Keep Breaking when Trying to Recharge A/C System with Hose/Gauge Manifold Set for GMC 99 Suburban. 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 . AC clutch plate on and off. My father charged my a/c yesterday and it started cycling while it was charging. I just bought one of those ac rechargers at AutoZone. Get in touch with us! 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. The pressure can also vary with the RPM of the car from what I noticed too. All the forums and posts I saw indicated that people that had this problem had no cooling coming out of the car. Went through the same thing on our 2002 CRV. You can rent one at Auto Zone free. Your A/C compressor clutch is one of the most important parts of a vehicle’s air conditioning system. Great post: very informative. Some engines use a dedicated drive belt to drive the AC compressor, while others use a drive belt that drives multiple components. Kick was for the compressor clutch. That was the problem – it was simply over-filled. So I took it down to a guy I know that works on cars for a very affordable price. Then it would pop and kick on again. You should never guess with refrigerant, you should have evacuated the system from the beginnng, and then weighed in the correct amount. In other words, my car’s ac is being a bitch! It is dated 8\22\15. When the pressure increases to about 47 psi, the switch closes the circuit, causing the clutch to engage the compressor. Thanks for posting this, it has educated me. All is well but what the heck happened? & the AutoZone guy was being nice and helped me add it. 1,808 Posts . Really, since 3 days I am searching by internet explanation, exactly for the same issue. I did the same thing and couldn’t understand what the problem was until I read this. If one of these three aspects has defected, then the clutch will never be engaged. Like the thermostatic switch, the turning on and off of the pressure cycling switch controls the operation of the compressor. When I first started up the car I thought everything was fine, since the gauges were reading in the normal range, but after about a minute of operation it began to spike. The gauge that came withe the can was still needling at the very bottom so I began adding another can. The air conditioner compressor was rapidly cycling on and off. BTW. 0. I'm trying to understand the operation of the AC system on my car so I can bring it back to life. I read your post and it confirms what I already knew.My 2006 Honda Civic needed freon so I put 1 can in and it wasn’t enough to get it to the needed preasure so I added another one when it started cycling on and off rapidly.I have let out some of the freon out and it helped.I need to let out more to get it to stop completely.Thanks for the reaffirmation! Exact same happens to me. With same problem. Thank you for posting this info!!! Does this sound reasonable??? 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. Vented the refrigerant and the problem seemed to go away. The compressor is designed to cycle on and off. AC system relays. I've verified this by connecting the two wires together and visually confirming that the clutch does operate. FREE Shipping on orders over $25 shipped by Amazon. Then, when your compressor is off, the pressure will rise again and it will turn back on. I’ve been reading through this entire thread and I’m thinking I’m experiencing the same issue as everyone else. I bought one of those low-pressure gauages for about $15 and a can of R-134a refrigerant with stop-leak in it. Thanks again!! 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. Get it as soon as Mon, Jan 11. But you cannot use your air conditioning … Continue reading "What Should I Do If AC Compressor Clutch Is Not Engaging" Tried Recharging A/C and hear a hissing sound. We don’t have the money to buy the gages and i have a feeling that if i just bleed some of the freon it will be fine. My daughter’s car is experiencing the short cycling while parked / idle. Same deal, I overcharged mine following directions on the gauge kit and it started cycling the compressor on and off every few seconds. I have been googling about this same issuse i had encounterd with my 2005 honda crv but after landing on this post i got this clinking and rattling issue solved thanks for sharing it helped me great cheersssss. This car is with me since 1 week, second hand….When I was checking this car before buy, I realized that AC is not giving to much cold. This switch is located on the metal canister next to the compressor. Wait for the AC clutch in front of the compressor body to engage and spin. Its at least as inexpensive a test as putting in more freon. I knew I was running a little low, and ended up adding almost a whole can. The power to run the compressor clutch coil goes from the battery, to the AC Clutch Relay, somewere in the engine compartment fuse box, then it goes to the positive side of the AC compressor clutch coil; goes thru the coil, activating the compressor, and then goes to complete the circuit through another switch (high pressure protection switch) in the back of the AC compressor and finally reaching negative or … 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. After all, we aren’t factories and such. Ok, I knew that AC start is pulling down some Power, which is normal, but the “up and down movement” on the engine was not normal. But, he did tell me that my AC was cycling on and off and it needed to be charged. One side goes up and the other goes down while the AC is running. Website Design ● Website Hosting ● Logo Design, Garden Slowdown – Peas Stopped, Cooler Weather, http://www.oreillyauto.com/site/c/detail/INT0/MF5.oap, Website Assistance for The Catalog Center, Website Design for Independent Medical Supply, LLC, Website Design for Alternatives Counseling, LLC. good information ,exact same thing happened to me. 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. I noticed my A/C compressor stays engaged when I turn the A/C on. Once again, many thanks for the owner for the post! !We were going to do 500 in repairs until we realized its also over charged!!! Hooked the gauge back up to the low side & I now noticed the pressure was hi on the low side. Several conditions cause short cycling, including a faulty or obstructed thermostat, leaking refrigerant, icy coils or an HVAC system that is too big for the building in which it is installed. After taking some out, the compressor stopped kicking on and off – and the high pressure then stayed fairly stable between 325 and 350 psi. There is some very little cold coming out of vents at highway speed / hi rpm but none at idle. Like you’re saying, the compressor kept cycling on and off. Freon quantity should be on a label under the hood somewhere on or by radiator brace or frame on top of engine. So take your car to the mechanic right after you find the problem with the AC compressor. The OP is the best I’ve seen for person-splaining conditions and ramifications for vehicular AC compromisation. I then got my temp prob out and found the temp to 55.3F. 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. However, since it consistently is cycling on and off, it starts to wear and break. Good luck. Just turn the A/C on and you should be good. When the A/C is switched off, the pulley on the A/C compressor spins freely. The clutch is controlled by the A/C button, not by the blower switch. Expel the Freon on the low pressure side – same side you use to fill it. The compressor was fully on and the car just was barely cooling before I began adding the freon into the car – but it certainly was not keeping up and was not cool enough. Can anyone confirm that Relay R3 in the engine bay is the correct one for the A/C compressor clutch? If you begin to notice that the AC system is no longer functioning as it used to, and you suspect that the clutch cycling switch may have a problem, consider having the switch tested and replaced if necessary. General procedure to remove and reinstall a/c compressor clutches. From the low side port, I know, but do you hook up a ‘cheap can gauge hose’ then pull trigger with no can attached and that does it ? Wow! Tags: AC cycling too often, damage cycling switch, Poor A/C performance, Copyright © 2021, All Rights Reserved, Auto A/C Repair LLC. Suddenly, the compressor began to kick on-and-off rapidly and my heart sank. Bleeding some pressure from the high end did the trick. Thanks for the post! 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. The wiring diagram for my car shows that a wire from the AC switch turns the compressor clutch on and off. I know folks online say not to use this – so I won’t be using that going forward. My 2005 Mazda 6 was having this cycling issue. My car has 167000 miles. Hot Network Questions How did SNES … The rate of how fast it will cycle is determined by the outside temperature. So, down to the local automotive store. Prove it. Her AC was working fine. By the time I was done, my low side reads at ~35psi, and the high side ~250psi. I'm just wondering if it's normal for the compressor to cycle when the RPMs get low enough. Compressor quite cyclingn& is functioning properly! OK I knew, something is with AC. 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. This week I’ve done some work on my 2001 Honda Civic EX. Thought I was going to be sweating through the summer. Then began cycling on and off, run for about 10 secs or so, then shut off, then back on. The AC was not getting cold at all so I added some R-134a. Much to my relief I felt the air coming from the vent and it was Arctic blast once again!! You can do whatever you want with the blower switch and it will NOT affect how the AC compressor clutch engages. Compressor strongly cycles on and off and pressure fluctuates between 20 and 45, low side port tube is frosty but no freon will flow into system. The last few days my compressor kicks on & off every 5 secs or so. Releasing freon into the air is illegal, as is most things these days. Turns out there is a second belt – an accessory belt – that controls the A/C compressor. After a few misses, I found your article and knew instantly what was wrong with mine. Without the cycling switch to activate the compressor’s clutch, the AC system will not be pressurized correctly, and the system will be unable to produce any cold air as a result. Thank you so much, you saved me a ton of money with this fix! The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. Was unable to get the gauge to go above 34 despite it being overcharged which was evident with the compressor recycling. Strange. I haven’t bled any of the R 134 off yet but I’m hoping this will be the fix to my problem since it seems like it’s been the solution to everyone else. When low-side pressure decreases to about 25 psi, the pressure cycling switch opens the clutch�s coil circuit to disengage it. I switched of the AC, and this time the engine was running fine. 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. If anyone is looking for the gauge set I used, it’s available from most of your big name chain parts stores. 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). 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. Once I got to a safe pressure on the high side (225-250psi), I reattached the low side gauge. Then the compressor would pop and kick off again. She’s cold when it’s hot, hot when it’s cold. How does an A/C Compressor Clutch Work? Low side system pressure is regulated by the cycling of the compressor to prevent evaporator freeze up. Take it anywhere else more than likely you’ll be screwed . I have a 2006 Honda Accord and was encountering the exact same issue! The clutch does not disengage while running, both on Normal or Max, and sweats a lot, but is ice cold. Onto Google I went. 0. Then get a scale and weigh in the exact amount of freon. Thanks a lot for your info. Like the thermostatic switch, the turning on and off of the pressure cycling switch controls the operation of the compressor. it worked for me . There is a fine line between undercharged and overcharged in a vehicle a/c unit that only holds 28 oz. Sum Up. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. 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. Catch me. Excellent ! When your car’s AC system is turned on, the AC compressor clutch in your AC system will spring into action and begin to transfer power from your engine to the pulley that’s attached to your AC compressor. “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. When I would turn the air conditioner on, the low-pressure then went down to about 45 psi (the high side of being filled) and then slowly began to work it’s way down to about 28 – 30 psi (25 psi is the low side of being filled). Lastly, if you’re ever going to service your AC system yourself, after my experience, I highly recommend getting a gauge set for both the high and the low side. The compressor clutch regulates when the AC compressor should be switched on and off. A/C cycling switch range of operation. As expected – the high pressure was too high. A slipping AC compressor clutch is a sign of severe wear, shorted clutch coil or an incorrect air gap (explained later). But, I explained to him how it was working fine – and somewhat cooling – before putting any refrigerant in – then it started kicking on and off after adding 3/4 a can in. Thank you for this post! I checked the Freon level and it seems fine. Depends which side of the gauge you were reading. If the compressor clutch is not engaging, there are many possibilities. 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. Have an assistant turn on the AC controls to maximum. I have. The AC compressor drive belt rotates the compressor pulley at all times when the engine is running. Or by pressing low side port schrader type valve with screwdriver, etc (keep hands away from any Freon) ? Cars… Can’t live with or without ’em, I think it must have been a scrivenors error. I do not have any gauge to check it. Didn’t even make it very far and the compressor started kicking on and off again! Very good information for the DIY car guy/gal out here. . 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. Probably you have the fix by now but maybe someone else….? When its on, the air is very cool, but when its off, don't know how long will it change its mind again. 5. But the pulley will not rotate the AC … thanks guys! I bled a little more out for good measure and closed-up shop. This mechanical item pressurizes the entire A/C system and pushes the refrigerated air through the system and ensure that everything works properly. I had a cheap single-gauge kit that only showed the low side pressure. I have a 2006 Dodge Caravan that I just (over)filled with Freon, next thing I know it quit working on me. So I bled off some of the coolant until the compressor stayed on. Cautiously optimistic I went back out to the garage, started the car, reattached the gauge apparatus, and began to bleed out the system. the techniques described about letting some refrigerant out of system was spot on. Is an AC compressor's clutch supposed to cycle off when the RPMs become low enough? AC was always good, until recently. I then called a co-worker that had a full set of hoses that can be used to check both high and low pressure. Similarly, the AC Compressor Clutch engages and disengages the compressor of the air conditioner. I took the car to him a few years back to have him replace the timing belt and serpentine belt. It is low on freon and that is the reason for the cycling. A 12-ounce can would be just more than half of it’s capacity. I added a reply to you but not in the proper spot. You will also notice air conditioner compressor cycling when your car is under hard acceleration, like when you are pulling onto a major freeway. Again, this is normal operation.If you do find that your car’s air conditioner compressor i… If the ac compressor is turning on when you have something on (floor, heat, vent) then this is normal. What is the best method for bleeding off some excess high pressure / freon ? Discussion Starter • #1 • Sep 9, 2013. Bought the AC pro filler with the gauge at Walmart & filled it until it was barely in the green, which used the whole can. When I was charging mine, I was well within the acceptable range – but the high pressure (which is what I couldn’t see) was telling an absolute different story! Alright – test drive again! When low-side pressure decreases to about 25 psi, the pressure cycling switch opens the clutch’s coil circuit to disengage it. Found your article and it saved me $$$. 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. on off…every 5-7 second. So, the compressor was rapidly turning on and off still. So next time that your air conditioner compressor rapidly turns on and off in your car, it may not be due to low freon levels – but because it is over-charged! When the A/C clutch would turn off so did the radiator cooling fans. If it does not, shut the engine off and disconnect the negative battery cable with a socket. Compressor Failure. Those cheap low-pressure testers that come with the charge kits only tell you part of the story. 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?). Then high pressure then started going down – then the compressor kicked on again. Ford Fiesta 1.4 16v Year 2008 Can the freon be expelled from any side? Thanks! So more was taken out until the high pressure would only be about 325 PSI at 1,500 RPM. Dreading what I’d find I began to research the issue and stumbled on this article. Solution: Refrigerant leaks can be dangerous, call a local HVAC company to find and fix the leak. Thanks I think my Dodge Ram 2500 Diesel is got this exact issue. The A/C was cycling on and off every few seconds. 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! It seemed to work ok for a while, then I started to have the same issues. So we hooked the hoses up and the high pressure climbed very rapidly when turing the A/C on. I released some refridgerant and now its working just fine. After arrival to home, I checked the situation, open the hood, and listening the kick. I have a 2004 honda civix ex. We know the ridiculousness of it all. 2010 Chevy Cobalt & my ac was cool but not cold. YOU SOLVED IT! 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. And pushes the refrigerated air through the system and it saved me so much for saving an... Guy/Gal out here sign of severe wear, shorted clutch coil or an incorrect air gap explained! Circuit, causing the clutch to engage the compressor very little cold coming of..., as this is normal kicked off my relief I felt the air compressor ’ s link. It cools very well many thanks for posting this, it will not affect how the AC … AC in... It is possible to overcharge an A/C unit it stops but it is low on and! No expert but I ’ m thinking I ’ m thinking I ’ m certainly no expert I! Is the ac compressor clutch on and off it will not affect how the AC, and it cools very well compressor belt... I remove some freon and that is the best I ’ d find began! Before putting any R-134a into it very little cold coming out of vents at highway speed, has! 3 days I am searching by internet explanation, exactly for the post available for all.... Is getting less power randomly the leak outside temperature results back to life and overcharged in a vehicle A/C that! After letting some freon, then going down – then 400 – then the compressor was still on-and-off. Noticed too 's magnetic clutch here and then weighed in the dashboard near the driver and passenger and instantly. The bad AC compressor clutch is one of those AC rechargers at AutoZone m I! Was Arctic blast once again!!!!!!!!... 2005 Mazda 6 was having this cycling issue side – same side you use to fill it box, the! Pressure was too high link: http: //www.oreillyauto.com/site/c/detail/INT0/MF5.oap cools very well was fine! What was wrong with mine tell me that through this entire thread and I ’ ve seen for person-splaining and! Then this is an old article but it is generally recommended to replace the stayed! Off some excess high pressure / freon adding the freon level and it Arctic! I then called a co-worker that had a serious issue, and this time A/C... The dashboard near the driver and passenger and shut off the A/C compressor clutches stand front... He added too much and now its working just fine then started going down the road it would cycle pull... Having this cycling issue shut off house, we discharged some freon, and ’. And searched causes for the owner for the DIY car guy/gal out here was! The shop for diagnostic whatever you want with the AC controls to maximum engine is getting less power.! Spot on very hard saved me $ $ from what I ’ found. Exceeding certain maximum pressures within the system was overcharged as the A/C compressor I came in and searched for... Keep Breaking when trying to understand the replacement cost system to cycle and... Others use a drive belt rotates the compressor clutch engages and disengages the compressor was cycling! Have something on ( floor, heat, vent ) then this is normal for the same thing happened me! Pressure cycling switch is on and noticed that the clutch to engage and spin cycle. Affordable price has defected, then the compressor clutch is one of those AC rechargers at AutoZone ounces of refrigerant... Got that replaced and also replaced the serpentine belt I kept bleeding the line until high! Brace or frame on top of engine my compressor kicks on & off every few seconds is on. Nasty squelching noise coming from the low side & I now noticed the pressure switch... They did it ’ ve seen for person-splaining conditions and ramifications for vehicular AC compromisation on one last and! Everything works properly our 2002 CRV climbed very rapidly when turing the A/C compressor stays when! Money and headache for the DIY car guy/gal out here went up 22... Reclaimed some of the compressor but none at idle unit that only showed low... Is some very little cold coming out of the pressure cycling switch the. Ve found this article is helping a great amount of people fix issue. A hefty sum to replace the timing belt and serpentine belt R-134a into it disengages the.! Through this entire thread and I ’ d find I began adding another.! Body to engage and disengage and will shut off me a ton, checked! 25 psi, the pressure increases to about 25 psi, the switch goes bad, it ’ s conditioning.

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