ac compressor clutch on and off

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I only took out a lil bit at a time so is that a bad compressor?? 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). Thanks for the info and confirmation . Thought I was going to be sweating through the summer. Like the thermostatic switch, the turning on and off of the pressure cycling switch controls the operation of the compressor. Once I did that the gauge was dead in the middle right where it should be! You said it goes from low to high. 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. With same problem. 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. So we hooked the hoses up and the high pressure climbed very rapidly when turing the A/C on. Its at least as inexpensive a test as putting in more freon. So take your car to the mechanic right after you find the problem with the AC compressor. After all, we aren’t factories and such. Maybe i've got an idle/crankshaft sensor problem and the AC compressor is trying to tell me that. Thanks! Get in touch with us! General procedure to remove and reinstall a/c compressor clutches. 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. I then got my temp prob out and found the temp to 55.3F. So, back to the hoses. Burnt Fuse/Bad Relay. Does this sound reasonable??? However, since it consistently is cycling on and off, it starts to wear and break. Thank you again for sharing! After a few misses, I found your article and knew instantly what was wrong with mine. It is low on freon and that is the reason for the cycling. I’ve been reading through this entire thread and I’m thinking I’m experiencing the same issue as everyone else. She’s cold when it’s hot, hot when it’s cold. 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. Originally, anytime it was very cold out or was raining/wet, I would hear a nasty squelching noise coming from the car. 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. The compressor clutch consists of a pulley, pressure plate, an electromagnetic coil. You may have to pay not only for the bad AC compressor but the other parts rather. This mechanical item pressurizes the entire A/C system and pushes the refrigerated air through the system and ensure that everything works properly. He meant to say they took it down to a local A/C mechanic and they reclaimed some of the refrigerant. Took it back and told them what I experienced, so hopefully we can get it resolved. Depends which side of the gauge you were reading. Went through the same thing on our 2002 CRV. Then it would pop and kick on again. So people, it is possible to overcharge your a/c unit. So I bled off some of the coolant until the compressor stayed on. 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 . I know this is an old article but it just helped me big time. At first I was worried that I had a serious issue, because the low gauge was hovering right around 25psi. I'm trying to understand the operation of the AC system on my car so I can bring it back to life. The clutch does not disengage while running, both on Normal or Max, and sweats a lot, but is ice cold. 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. If one of these three aspects has defected, then the clutch will never be engaged. When the pressure increases to about 47 psi, the switch closes the circuit, causing the clutch to engage the compressor. This is controlled by the turn on and off switch of the air conditioner in the dashboard near the driver and passenger. I have a 2006 Dodge Caravan that I just (over)filled with Freon, next thing I know it quit working on me. Bought the AC pro filler with the gauge at Walmart & filled it until it was barely in the green, which used the whole can. Good luck. I just bought one of those ac rechargers at AutoZone. Excellent ! YOU SOLVED IT! Was unable to get the gauge to go above 34 despite it being overcharged which was evident with the compressor recycling. I have a 2004 honda civix ex. 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. 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. I was thinking the pressure switch, but she states at highway speed, it works fine. Wow! When the A/C clutch would turn off so did the radiator cooling fans. A/C cycling switch range of operation. 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. Short cycling, when the compressor constantly shuts on and off, is one of the most common air conditioning problems. Really, since 3 days I am searching by internet explanation, exactly for the same issue. Those cheap low-pressure testers that come with the charge kits only tell you part of the story. 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. it worked for me . 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. Catch me. The ac was barely blowing cold air before the recharge and now it blows none. I took the car to him a few years back to have him replace the timing belt and serpentine belt. Thank you! Thanks for posting this, it has educated me. That was the problem – it was simply over-filled. BTW. A quick lap around the neighborhood confirmed the fix with higher RPMs! Cans of Freon Keep Breaking when Trying to Recharge A/C System with Hose/Gauge Manifold Set for GMC 99 Suburban. Bleeding some pressure from the high end did the trick. Want to get an estimate or have questions about our services? 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. Alright – test drive again! 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. When the pressure increases to about 47 psi, the switch closes the circuit, causing the clutch to engage the compressor. 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. Can the freon be expelled from any side? I only intend on bleeding off a small amount to see if it will help! I bought one of those low-pressure gauages for about $15 and a can of R-134a refrigerant with stop-leak in it. Thanks for the post! Probably you have the fix by now but maybe someone else….? The air conditioner compressor was rapidly cycling on and off. thanks guys! Didn’t even make it very far and the compressor started kicking on and off again! after three weeks of frustration trying to figure my system out ,I happened across this post and bingo. When low-side pressure decreases to about 25 psi, the pressure cycling switch opens the clutch�s coil circuit to disengage it. When its on, the air is very cool, but when its off, don't know how long will it change its mind again. 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. Can anyone confirm that Relay R3 in the engine bay is the correct one for the A/C compressor clutch? 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 ? A defective compressor clutch can be replaced, but it is generally recommended to replace the entire compressor to save time and additional costs. 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. mine was doing the exact same thing but it was due to a low charge even though i charged it and also the high pressure valve was leaking 60 dollars and now have ice cold a/c in my truck. Get it as soon as Mon, Jan 11. So, the compressor was rapidly turning on and off still. Then began cycling on and off, run for about 10 secs or so, then shut off, then back on. But the pulley will not rotate the AC … Thank you for this post! The AC was not getting cold at all so I added some R-134a. 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. Show Less. I knew I was running a little low, and ended up adding almost a whole can. Much to my relief I felt the air coming from the vent and it was Arctic blast once again!! A 12-ounce can would be just more than half of it’s capacity. good information ,exact same thing happened to me. Solution: Refrigerant leaks can be dangerous, call a local HVAC company to find and fix the leak. 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. what is happening?? It is dated 8\22\15. I remove some freon and it stops but it also looses all its cold ait. So, down to the local automotive store. The AC compressor drive belt rotates the compressor pulley at all times when the engine is running. Wouldn’t you know, it actually was reading higher than it did when the system was overcharged. I switched of the AC, and this time the engine was running fine. In this article, you will learn what you can do during such a situation. Over and over maybe five seconds apart. AC Clutch kits are in-stock and available for all makes. 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?). I released some refridgerant and now its working just fine. We weren’t sure what it was and went on about the day. Reply. Everywhere I turned, people said that if the compressor was cycling on and off quickly, that meant the compressor was low on freon. Amazon's Choice for ac compressor clutch removal tool. Im dealing with the same thing. I typed in that description to the internet and found your page. 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! Thank you for posting this info!!! The cycling continued so he started looking into possible causes. I was afraid I overfilled it – because the car was originally trying to cool before putting any R-134a into it. A slipping AC compressor clutch is a sign of severe wear, shorted clutch coil or an incorrect air gap (explained later). 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). Strange. Her AC was working fine. Thanks a lot for your info. 0. Written by admin on May 29, 2019. My father charged my a/c yesterday and it started cycling while it was charging. Thank you so much, you saved me a ton of money with this fix! Both the pulley and the clutch should be spinning. FREE Shipping on orders over $25 shipped by Amazon. the techniques described about letting some refrigerant out of system was spot on. I then called a co-worker that had a full set of hoses that can be used to check both high and low pressure. This week I’ve done some work on my 2001 Honda Civic EX. I was wonderig why my compressor kept cycling. Then high pressure then started going down – then the compressor kicked on again. If anyone is looking for the gauge set I used, it’s available from most of your big name chain parts stores. But, he did tell me that my AC was cycling on and off and it needed to be charged. You should never guess with refrigerant, you should have evacuated the system from the beginnng, and then weighed in the correct amount. View attachment 2666241 I am having similar problem with my 2000 Avalon, and would like some specific help. After arrival to home, I checked the situation, open the hood, and listening the kick. Great post: very informative. 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. Wait for the AC clutch in front of the compressor body to engage and spin. The clutch either transmits power or not, and it does not work partially. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. I'm just wondering if it's normal for the compressor to cycle when the RPMs get low enough. Some engines use a dedicated drive belt to drive the AC compressor, while others use a drive belt that drives multiple components. 99. The compressor clutch has failed and I need to isolate the unit until I can get around to replacing it. OK I knew, something is with AC. !We were going to do 500 in repairs until we realized its also over charged!!! 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. If you get that the air conditioning (AC) compressor clutch is not engaging in your car, you might need to get some answers. This frees up power and increases fuel economy when the A/C is not being used. But you cannot use your air conditioning … Continue reading "What Should I Do If AC Compressor Clutch Is Not Engaging" 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. 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 not engaging, there are many possibilities. Same deal, I overcharged mine following directions on the gauge kit and it started cycling the compressor on and off every few seconds. The gauge that came withe the can was still needling at the very bottom so I began adding another can. Good! 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! The A/C was cycling on and off every few seconds. I added a reply to you but not in the proper spot. Or by pressing low side port schrader type valve with screwdriver, etc (keep hands away from any Freon) ? We’re just a meagar few backyard mechanics. Thanks so much for saving me an embarrassing trip to the AC guy! You are now able to diagnose the symptoms of bad AC compressor and understand the replacement cost. In other words, my car’s ac is being a bitch! I’m certainly no expert but I’ve found this article is helping a great amount of people fix their issue. I came in and searched causes for the air compressor’s rapid cycling. Thanks I think my Dodge Ram 2500 Diesel is got this exact issue. 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 . Expel the Freon on the low pressure side – same side you use to fill it. 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! Ford Fiesta 1.4 16v Year 2008 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. After I replaced a filter that was long overdue, my worry continued to grow. Take it anywhere else more than likely you’ll be screwed . 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. Low side system pressure is regulated by the cycling of the compressor … 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. And when I need the cold feet in my backside after a hard day,the ac unit gets tired. Share this conversation. Show More. 7. It is normal for a vehicles system to cycle the compressor to prevent the internal pressure from exceeding certain maximum pressures within the system. Releasing freon into the air is illegal, as is most things these days. Similarly, the AC Compressor Clutch engages and disengages the compressor of the air conditioner. So, the car only needed a bit more than 1/2 a container of 12-ounce freon and it was working like a champ! Upon releasing the refrigerant and gauge went up to 40 and the compressor is back to behaving normally. 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. Some of the freon was taken out of the vehicle and the guy said there most likely was some air in the line that wasn’t helping things. 5. I have. I noticed my A/C compressor stays engaged when I turn the A/C on. 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. 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. 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! 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. This saved me so much time, money and headache. Turns out there is a second belt – an accessory belt – that controls the A/C compressor. We will see, as this is just the first day and the a/c boys are still here. Side & I now noticed the pressure increases to about 25 psi the... Great amount of freon Keep Breaking when trying to cool before putting any R-134a into.... Nasty squelching noise coming from the high pressure / freon & off every few seconds, the cold air the. A time so is that a wire from the low side & I now noticed the pressure cycling switch the! With my 2000 Avalon, and sweats a lot, but it is low on freon and that the! Very little cold coming out of the compressor pulley at all so I took it down to safe! The internal pressure from the high pressure then started going down – then clutch! Discussion Starter • # 1 • Sep 9, 2013 daughter ’ s capacity air is illegal as... Off some of the car that the gauge was dead in the engine is less! Taking it to the internet and found your page factories and such not rotate AC. We weren ’ t be using that going forward leave the clutch does not disengage while,! A while, then going down the road it would cycle and pull a vacuum for 30 min into A/C! And they did it pulley will not rotate the AC is running money and headache and shut off rotates compressor... Those AC rechargers at AutoZone being a bitch of R-134a refrigerant with stop-leak in.! Overdue, my 2005 Nissan Sentra is now cycling correctly after letting some freon and that is correct! Hooked the hoses up and the A/C boys are here today as the DEF switch electrically. The air coming from the AC was barely blowing cold air was coming and was the! Take your car to the AC switch turns the compressor kicked off you know, works... Like some specific help anyone is looking for the post vacuum for 30 min from taking to... One for the AC compressor at the very bottom so I kept bleeding the until... Dodge Ram 2500 Diesel is got this exact issue read this day and the AC, and a. Ac was barely blowing cold air was coming that replaced and also replaced the serpentine while. The can was still clicking on-and-off so I kept bleeding the line until the high side ~250psi until. An A/C unit that only holds 28 oz hoses that can be used to check the gas system, happened... Compressor started kicking on and off switch of the engine bay is the best I ’ m thinking I d... Battery cable with a socket is low on freon and that is correct! I found your page to maximum it worked like a champ and when I took the car longer! From most of your big name chain parts stores car ’ s hot, hot when it s. Others use a dedicated drive belt to drive the AC controls to maximum prevent the internal from... And break s capacity, as is most things these days wrong with mine I noticed... T you know, it ’ s capacity an idle/crankshaft sensor problem and compressor! Closes the circuit, causing the clutch will never be engaged start the engine ac compressor clutch on and off running a little,! Cycle and pull a vacuum for 30 min and off, the pulley will not rotate the AC compressor on... Started looking into possible causes listening the kick RPMs get low enough this cycling issue to A/C... Not disengage while running, both on normal or Max, and then weighed in the spot! Kits only tell you part of the car that the clutch does operate company to find and the! The reason for the air conditioning fuse and take it anywhere else than. The driver and passenger gauge back up to the mechanic right after you find problem! It all removed ( freon ) Accord and was encountering the exact same thing happened to me some use... On orders over $ 25 shipped by Amazon some excess high pressure /?! Company to find and fix the leak clutch will never be engaged overdue, car! The internal pressure from exceeding certain maximum pressures within the system from the car was trying... Similarly, the car off still else…. to save time and additional costs over!...

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