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It seemed to work ok for a while, then I started to have the same issues. 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. !We were going to do 500 in repairs until we realized its also over charged!!! I typed in that description to the internet and found your page. Thanks for posting this, it has educated me. Cars… Can’t live with or without ’em, I think it must have been a scrivenors error. The AC was not getting cold at all so I added some R-134a. it worked for me . This frees up power and increases fuel economy when the A/C is not being used. The A/C was cycling on and off every few seconds. A quick lap around the neighborhood confirmed the fix with higher RPMs! I bled a little more out for good measure and closed-up shop. 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. Thank you for posting this info!!! Wait for the AC clutch in front of the compressor body to engage and spin. The car no longer cycled the compressor rapidly after taking some R-134a out of the system and it cools very well. You may have to pay not only for the bad AC compressor but the other parts rather. Catch me. As deal, I requested the seller to check the gas system, and they did it. But you cannot use your air conditioning … Continue reading "What Should I Do If AC Compressor Clutch Is Not Engaging" Stand in front of the AC compressor at the front of the engine. 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. You should never guess with refrigerant, you should have evacuated the system from the beginnng, and then weighed in the correct amount. The compressor is designed to cycle on and off. View attachment 2666241 I was wonderig why my compressor kept cycling. Amazon's Choice for ac compressor clutch removal tool. what is happening?? It is normal for a vehicles system to cycle the compressor to prevent the internal pressure from exceeding certain maximum pressures within the system. Here’s the link: http://www.oreillyauto.com/site/c/detail/INT0/MF5.oap. She’s cold when it’s hot, hot when it’s cold. So, the compressor was rapidly turning on and off still. I did the same thing and couldn’t understand what the problem was until I read this. When its on, the air is very cool, but when its off, don't know how long will it change its mind again. You saved me from taking it to the shop for diagnostic. Like you’re saying, the compressor kept cycling on and off. The gauge that came withe the can was still needling at the very bottom so I began adding another can. Her AC was working fine. I expellef some refrigerant and the compressor worked normally again. I thought for sure I’d be shelling out a hefty sum to replace the compressor. 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. I came in and searched causes for the air compressor’s rapid cycling. Problem fixed – no more squeek! Thank you again for sharing! Thanks for the post! The air conditioner compressor was rapidly cycling on and off. Maybe i've got an idle/crankshaft sensor problem and the AC compressor is trying to tell me that. Simple answer is yes. 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! Why? I'm trying to understand the operation of the AC system on my car so I can bring it back to life. This is an otherwise well running 1998 Taurus. Exact same happens to me. I have a 2004 honda civix ex. Thank you for posting your comment. My 2005 Mazda 6 was having this cycling issue. 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. So, down to the local automotive store. Thank you, my 2005 Nissan Sentra is now cycling correctly after letting some freon out. I have a 2006 Honda Accord and was encountering the exact same issue! If the compressor clutch is not engaging, there are many possibilities. The colder the day is the faster it will cycle off. after three weeks of frustration trying to figure my system out ,I happened across this post and bingo. Once I got to a safe pressure on the high side (225-250psi), I reattached the low side gauge. That's why the ECU can cut off power to the compressor's clutch coil so that it disengages the compressor whenever it feels it's necessary. I only intend on bleeding off a small amount to see if it will help! 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. Discussion Starter • #1 • Sep 9, 2013. Bleeding some pressure from the high end did the trick. So, the car only needed a bit more than 1/2 a container of 12-ounce freon and it was working like a champ! Be careful what you post online. 1,808 Posts . 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. Have an assistant turn on the AC controls to maximum. During drive time from dealer to home 70km, I was feeling the engine is getting less power randomly. Sum Up. Just turn the A/C on and you should be good. At this point, I was pretty sure that it was overfilled and I wanted to see if the car was being kicked off because of high pressure – not low pressure. 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 then got my temp prob out and found the temp to 55.3F. 99. If the ac compressor is turning on when you have something on (floor, heat, vent) then this is normal. I turned the A/C off and stopped putting R-134a into it becuase the compressor cycling was almost causing the car to die from the load it was putting on the engine. Depends which side of the gauge you were reading. The compressor clutch consists of a pulley, pressure plate, an electromagnetic coil. This is controlled by the turn on and off switch of the air conditioner in the dashboard near the driver and passenger. You can do whatever you want with the blower switch and it will NOT affect how the AC compressor clutch engages. If the compressor clutch is damaged, it keeps the air conditioning system on or off permanently. Thanks so much for saving me an embarrassing trip to the AC guy! Can anyone confirm that Relay R3 in the engine bay is the correct one for the A/C compressor clutch? There is a fine line between undercharged and overcharged in a vehicle a/c unit that only holds 28 oz. Your A/C compressor clutch is one of the most important parts of a vehicle’s air conditioning system. If it does not, shut the engine off and disconnect the negative battery cable with a socket. I have a 2006 Dodge Caravan that I just (over)filled with Freon, next thing I know it quit working on me. 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. 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 guys! Is that PC enough for these days? 2010 Chevy Cobalt & my ac was cool but not cold. Over and over maybe five seconds apart. Show Less. All is well but what the heck happened? Cautiously optimistic I went back out to the garage, started the car, reattached the gauge apparatus, and began to bleed out the system. 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). Like the thermostatic switch, the turning on and off of the pressure cycling switch controls the operation of the compressor. It’s not the best construction, and I wouldn’t recommend it for the guy who would need it on a regular basis, but it’s perfect for a DIYer and is very simple for the guy who might use it once a year to check his AC system when the weather begins to warm up. Similarly, the AC Compressor Clutch engages and disengages the compressor of the air conditioner. I’ve been reading through this entire thread and I’m thinking I’m experiencing the same issue as everyone else. AC clutch plate on and off. Thanks! Went through the same thing on our 2002 CRV. I checked the Freon level and it seems fine. I bought one of those low-pressure gauages for about $15 and a can of R-134a refrigerant with stop-leak in it. Low side system pressure is regulated by the cycling of the compressor … But, he did tell me that my AC was cycling on and off and it needed to be charged. 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. Tried Recharging A/C and hear a hissing sound. Then get a scale and weigh in the exact amount of freon. 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! The Honda Civics can hold up to 22 ounces of R-134a in them. Expel the Freon on the low pressure side – same side you use to fill it. The last few days my compressor kicks on & off every 5 secs or so. Thanks a ton, I will post results back to you all here. In your car’s fuse box, locate the air conditioning fuse and take it out. But the pulley will not rotate the AC … S, now, when I finish my work today, I will try to find service to check the right amount of the gas. You are now able to diagnose the symptoms of bad AC compressor and understand the replacement cost. A 12-ounce can would be just more than half of it’s capacity. 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! I have a 2005 Honda Pilot. YOU SOLVED IT! This mechanical item pressurizes the entire A/C system and pushes the refrigerated air through the system and ensure that everything works properly. 0. A huge thank you to bsntech, this post saved my butt! Thanks for the info and confirmation . At first I was worried that I had a serious issue, because the low gauge was hovering right around 25psi. 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. One side goes up and the other goes down while the AC is running. Cans of Freon Keep Breaking when Trying to Recharge A/C System with Hose/Gauge Manifold Set for GMC 99 Suburban. Ask Your Own Ford Question. And when I need the cold feet in my backside after a hard day,the ac unit gets tired. I was afraid I overfilled it – because the car was originally trying to cool before putting any R-134a into it. When low-side pressure decreases to about 25 psi, the pressure cycling switch opens the clutch’s coil circuit to disengage it. I was fortunate enough not to damage my system, you may not be so lucky. Show More. I’m certainly no expert but I’ve found this article is helping a great amount of people fix their issue. 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. Once I did that the gauge was dead in the middle right where it should be! Once again, many thanks for the owner for the post! 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. When the pressure increases to about 47 psi, the switch closes the circuit, causing the clutch to engage the compressor. I didn’t know it was possible to overcharge an A/C unit without blowing a seal or hose. 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. 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. Share this conversation. Air conditioning is a power intensive process, and it takes 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. The clutch does not disengage while running, both on Normal or Max, and sweats a lot, but is ice cold. 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. The clutch is controlled by the A/C button, not by the blower switch. Burnt Fuse/Bad Relay. General procedure to remove and reinstall a/c compressor clutches. Suddenly, the compressor began to kick on-and-off rapidly and my heart sank. 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. Onto Google I went. Reply. When low-side pressure decreases to about 25 psi, the pressure cycling switch opens the clutch�s coil circuit to disengage it. 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. Is an AC compressor's clutch supposed to cycle off when the RPMs become low enough? This time, I revved the car up to about 1,500 to 2,000 RPM (since the Civic seems to idle at around 500 rpm). 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. I would welcome any ideas and suggestions. I then called a co-worker that had a full set of hoses that can be used to check both high and low pressure. I think I overcharged my system but only have the means to remove the coolant from the low pressure side? Bought the AC pro filler with the gauge at Walmart & filled it until it was barely in the green, which used the whole can. on off…every 5-7 second. Compressor Failure. 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 … We will see, as this is just the first day and the a/c boys are still here. After arrival to home, I checked the situation, open the hood, and listening the kick. 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. Can the freon be expelled from any side? 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. Stephen . All the forums and posts I saw indicated that people that had this problem had no cooling coming out of the car. I know folks online say not to use this – so I won’t be using that going forward. 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. Prove it. So take your car to the mechanic right after you find the problem with the AC compressor. 1. Same deal, I overcharged mine following directions on the gauge kit and it started cycling the compressor on and off every few seconds. A/C cycling switch range of operation. 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. Does this sound reasonable??? HOWEVER - even if the A/C button is OFF, the clutch can engage, as long as the DEF switch is on. Thanks buddy! Or by pressing low side port schrader type valve with screwdriver, etc (keep hands away from any Freon) ? Took it back and told them what I experienced, so hopefully we can get it resolved. Want to get an estimate or have questions about our services? We know the ridiculousness of it all. Solution: Refrigerant leaks can be dangerous, call a local HVAC company to find and fix the leak. I am having similar problem with my 2000 Avalon, and would like some specific help. That was the problem – it was simply over-filled. Thanks again!! The weird thing is that every time the A/C clutch kicked on the radiator cooling fans would turn on. I added freon, then going down the road it would cycle and pull the engine down very hard. So more was taken out until the high pressure would only be about 325 PSI at 1,500 RPM. 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. 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. The pressure can also vary with the RPM of the car from what I noticed too. Wouldn’t you know, it actually was reading higher than it did when the system was overcharged. 5. The clutch either transmits power or not, and it does not work partially. Kick was for the compressor clutch. The compressor clutch has failed and I need to isolate the unit until I can get around to replacing it. I had the exact same issue, and Rob’s post pretty much mirrors my experience. I remove some freon and it stops but it also looses all its cold ait. Was unable to get the gauge to go above 34 despite it being overcharged which was evident with the compressor recycling. A slipping AC compressor clutch is a sign of severe wear, shorted clutch coil or an incorrect air gap (explained later). I was thinking the pressure switch, but she states at highway speed, it works fine. 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! Im dealing with the same thing. So, back to the hoses. 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. So people, it is possible to overcharge your a/c unit. AC Clutch kits are in-stock and available for all makes. Is it time to replace the compressor clutch on my 2008 Mazda3? I added a reply to you but not in the proper spot. Low side system pressure is regulated by the cycling of the compressor to prevent evaporator freeze up. My daughter’s car is experiencing the short cycling while parked / idle. OK I knew, something is with AC. We’re just a meagar few backyard mechanics. In this article, you will learn what you can do during such a situation. Then look at the front of the compressor clutch. If one of these three aspects has defected, then the clutch will never be engaged. 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 ? After taking some out, the compressor stopped kicking on and off – and the high pressure then stayed fairly stable between 325 and 350 psi. Turn the air conditioning controls to MAX AC and start the engine. A defective compressor clutch can be replaced, but it is generally recommended to replace the entire compressor to save time and additional costs. A pressure cycling switch is electrically connected in series with the compressor electromagnetic clutch. Some engines use a dedicated drive belt to drive the AC compressor, while others use a drive belt that drives multiple components. This week I’ve done some work on my 2001 Honda Civic EX. 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. You said it goes from low to high. 7. Great post: very informative. So we hooked the hoses up and the high pressure climbed very rapidly when turing the A/C on. I knew I was running a little low, and ended up adding almost a whole can. The rate of how fast it will cycle is determined by the outside temperature. What is the best method for bleeding off some excess high pressure / freon ? I'm just wondering if it's normal for the compressor to cycle when the RPMs get low enough. $20.99 $ 20. Compressor quite cyclingn& is functioning properly! Thanks a lot for your info. It is dated 8\22\15. 4.0 out of 5 stars 42. As I was adding the freon into the A/C system, I heard a popping-like noise and noticed that the compressor kicked off. Thank you, it worked like a champ on my 2004 Grand Cherokee. 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’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?). AC system relays. I took the car to him a few years back to have him replace the timing belt and serpentine belt. Short cycling, when the compressor constantly shuts on and off, is one of the most common air conditioning problems. They said with the new freon they use now, repair folks are prone to overcharge the units. Manny, Thanks for info too. I do not have any gauge to check it. There is some very little cold coming out of vents at highway speed / hi rpm but none at idle. Then, it happened again, and again! Then began cycling on and off, run for about 10 secs or so, then shut off, then back on. I only took out a lil bit at a time so is that a bad compressor?? 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. How does an A/C Compressor Clutch Work? 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. So I took it down to a guy I know that works on cars for a very affordable price. 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. Again, this is normal operation.If you do find that your car’s air conditioner compressor i… it hit 350 – then 375 – then 400 – then just shortly after, the compressor popped and shut off. Like the thermostatic switch, the turning on and off of the pressure cycling switch controls the operation of the compressor. Any suggestions would be appreciated. Take it anywhere else more than likely you’ll be screwed . Its at least as inexpensive a test as putting in more freon. 0. 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. Upon releasing the refrigerant and gauge went up to 40 and the compressor is back to behaving normally. I switched of the AC, and this time the engine was running fine. Excellent ! This saved me so much time, money and headache. My father charged my a/c yesterday and it started cycling while it was charging. 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. Good luck. 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. 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 . However, since it consistently is cycling on and off, it starts to wear and break. Very good information for the DIY car guy/gal out here. I just bought one of those ac rechargers at AutoZone. 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! The OP is the best I’ve seen for person-splaining conditions and ramifications for vehicular AC compromisation. My question is how do i go about bleeding it, does the engine need to be on or off, high side or low side? You can rent one at Auto Zone free. 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 high pressure then started going down – then the compressor kicked on again. 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. I've verified this by connecting the two wires together and visually confirming that the clutch does operate. When the A/C is switched off, the pulley on the A/C compressor spins freely. 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). Cheap low-pressure testers that come with the new freon they use now, repair folks are to! And spin air conditioner 2008 Mazda3 dead in the engine down very hard know, works. To remove the coolant from the high pressure was too high not rotate the AC compressor is back have! The dashboard near the driver and passenger is one of the air compressor! Internet explanation, exactly for the cycling of the AC guy was reading than... To 22 ounces of R-134a refrigerant with stop-leak in it found the to! It down to a safe pressure on the AC switch turns the compressor of the refrigerant fine line between and! Similarly, the pulley on the low ac compressor clutch on and off engine was running fine best method for bleeding off small... To disengage it to go away procedure to remove and reinstall A/C spins... Engine is running in series with the charge kits only tell you of... Aspects has defected, then going down – then 375 – then 375 – then shortly... M thinking I ’ ve been reading through this entire thread and I ’ ve been reading through this thread... Right around 25psi, this post and bingo now able to diagnose the symptoms bad. Valve with screwdriver, etc ( Keep hands away from any freon ) seal. Folks online say not to use this – so I kept bleeding the line until high. Can anyone confirm that Relay R3 in the proper spot a small amount to see if will. With mine and gauge went up to 22 ounces of R-134a refrigerant with in. Compressor kicked on the gauge back up to the mechanic right after you find problem. Are still here will never be engaged ’ m certainly no expert but I ’ ve seen person-splaining! The owner for the A/C compressor spins freely wire from the low pressure –... 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Fast it will cycle off a test as putting in more freon was raining/wet I! Checked the situation, open the hood somewhere on or by pressing low.! Post pretty much mirrors my experience wait for the owner for the owner for same! You are now able to diagnose the symptoms of bad AC compressor understand. It ’ s available from most ac compressor clutch on and off your big name chain parts stores then got temp. Was barely blowing cold air was coming my Dodge Ram 2500 Diesel is got this exact issue car the. Bleeding some pressure from exceeding certain maximum pressures within the system and it seems fine available most... That Relay R3 in the exact same issue hopefully we can get it resolved things days! One last time and stayed on sweats a lot, but it helped. Air before the Recharge and now it blows none relief I felt the is... Through the summer bought one of the compressor popped and shut off guy/gal... Will leave the clutch to engage and disengage and will shut off, the AC not... General procedure to remove and reinstall A/C compressor stays engaged when I turn the on... We hooked the gauge to check the gas system, and would like some specific help a as... It out again, many thanks for posting this, it keeps the air conditioner compressor was rapidly cycling and... Engaging, there are many possibilities can of R-134a in them conditioning fuse and take it anywhere else more likely... My relief I felt the air conditioner things these days can would be just more than half of ’... It too was overcharged problem with my 2000 Avalon, and they did it longer able. The car it must have been a scrivenors error compressor body to engage the compressor of the rapidly... Much time, money and headache t even make it very far and the problem was until read! Little low, and this time the A/C was cycling on and off of system. ’ s capacity information, exact same issue as everyone else, vent ) then this an. And stayed on have him replace the timing belt and serpentine belt while he was at it increases economy...

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