ac compressor clutch on and off
I had the exact same issue, and Rob’s post pretty much mirrors my experience. I have. So take your car to the mechanic right after you find the problem with the AC compressor. But the pulley will not rotate the AC … Wouldn’t you know, it actually was reading higher than it did when the system was overcharged. 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). 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. But, he did tell me that my AC was cycling on and off and it needed to be charged. 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 noticed my A/C compressor stays engaged when I turn the A/C on. Prove it. Like you’re saying, the compressor kept cycling on and off. It is normal for a vehicles system to cycle the compressor to prevent the internal pressure from exceeding certain maximum pressures within the system. So we hooked the hoses up and the high pressure climbed very rapidly when turing the A/C on. Why? They said with the new freon they use now, repair folks are prone to overcharge the units. By the time I was done, my low side reads at ~35psi, and the high side ~250psi. The AC was not getting cold at all so I added some R-134a. When there’s a problem with the compressor clutch, … I have a 2006 Honda Accord and was encountering the exact same issue! You saved me from taking it to the shop for diagnostic. 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. Both the pulley and the clutch should be spinning. You can rent one at Auto Zone free. After arrival to home, I checked the situation, open the hood, and listening the kick. Hooked the gauge back up to the low side & I now noticed the pressure was hi on the low side. I bled a little more out for good measure and closed-up shop. One side goes up and the other goes down while the AC is running. $20.99 $ 20. Sum Up. Thank you, my 2005 Nissan Sentra is now cycling correctly after letting some freon out. 1,808 Posts . So I bled off some of the coolant until the compressor stayed on. Low side system pressure is regulated by the cycling of the compressor … When the pressure increases to about 47 psi, the switch closes the circuit, causing the clutch to engage the compressor. the techniques described about letting some refrigerant out of system was spot on. The weird thing is that every time the A/C clutch kicked on the radiator cooling fans would turn on. A slipping AC compressor clutch is a sign of severe wear, shorted clutch coil or an incorrect air gap (explained later). When its on, the air is very cool, but when its off, don't know how long will it change its mind again. The compressor clutch kicks on and off randomly during the driving. 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. Its at least as inexpensive a test as putting in more freon. I bought one of those low-pressure gauages for about $15 and a can of R-134a refrigerant with stop-leak in it. S, now, when I finish my work today, I will try to find service to check the right amount of the gas. 99. Well i think he added too much and now my ac is cycling on and off and blowing warm air! Probably you have the fix by now but maybe someone else….? We’re just a meagar few backyard mechanics. However, since it consistently is cycling on and off, it starts to wear and break. Cars… Can’t live with or without ’em, I think it must have been a scrivenors error. Problem fixed – no more squeek! Was unable to get the gauge to go above 34 despite it being overcharged which was evident with the compressor recycling. Cautiously optimistic I went back out to the garage, started the car, reattached the gauge apparatus, and began to bleed out the system. 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. Turn the air conditioning controls to MAX AC and start the engine. Compressor quite cyclingn& is functioning properly! Is an AC compressor's clutch supposed to cycle off when the RPMs become low enough? 0. 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. Similarly, the AC Compressor Clutch engages and disengages the compressor of the air conditioner. Excellent ! 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 … Good! Stephen . When low-side pressure decreases to about 25 psi, the pressure cycling switch opens the clutch�s coil circuit to disengage it. 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). 4.0 out of 5 stars 42. 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. I released some refridgerant and now its working just fine. If one of these three aspects has defected, then the clutch will never be engaged. A quick lap around the neighborhood confirmed the fix with higher RPMs! Want to get an estimate or have questions about our services? The AC compressor drive belt rotates the compressor pulley at all times when the engine is running. Can anyone confirm that Relay R3 in the engine bay is the correct one for the A/C compressor clutch? thanks guys! I made a quick trip to my parents’ house, we discharged some freon, and it is running smoothly again! 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. 2010 Chevy Cobalt & my ac was cool but not cold. 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. Like the thermostatic switch, the turning on and off of the pressure cycling switch controls the operation of the compressor. Dreading what I’d find I began to research the issue and stumbled on this article. You will also notice air conditioner compressor cycling when your car is under hard acceleration, like when you are pulling onto a major freeway. 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! Thanks buddy! The wiring diagram for my car shows that a wire from the AC switch turns the compressor clutch on and off. OK – so explain this to me – why was the compressor not cycling at all before I put the refrigerant into the car – and only started happening when I got about 3/4 a 12-ounce can into the car? Again, this is normal operation.If you do find that your car’s air conditioner compressor i… But you cannot use your air conditioning … Continue reading "What Should I Do If AC Compressor Clutch Is Not Engaging" It worked! The clutch either transmits power or not, and it does not work partially. BTW. 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. Vented the refrigerant and the problem seemed to go away. After I replaced a filter that was long overdue, my worry continued to grow. AC clutch plate on and off. 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. Thought I was going to be sweating through the summer. Freon quantity should be on a label under the hood somewhere on or by radiator brace or frame on top of engine. 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. I just bought one of those ac rechargers at AutoZone. The compressor is designed to cycle on and off. Take it anywhere else more than likely you’ll be screwed . Depends which side of the gauge you were reading. A huge thank you to bsntech, this post saved my butt! The Honda Civics can hold up to 22 ounces of R-134a in them. If anyone is looking for the gauge set I used, it’s available from most of your big name chain parts stores. !We were going to do 500 in repairs until we realized its also over charged!!! Share this conversation. In your car’s fuse box, locate the air conditioning fuse and take it out. During drive time from dealer to home 70km, I was feeling the engine is getting less power randomly. 1. With same problem. You may have to pay not only for the bad AC compressor but the other parts rather. That was the problem – it was simply over-filled. So, down to the local automotive store. I switched of the AC, and this time the engine was running fine. AC system relays. 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). As expected – the high pressure was too high. 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. Low side system pressure is regulated by the cycling of the compressor to prevent evaporator freeze up. 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. I do not have any gauge to check it. Show Less. Then began cycling on and off, run for about 10 secs or so, then shut off, then back on. I have a 2006 Dodge Caravan that I just (over)filled with Freon, next thing I know it quit working on me. Design by Final Web Design. 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. If the compressor clutch is not engaging, there are many possibilities. Here’s the link: http://www.oreillyauto.com/site/c/detail/INT0/MF5.oap. Upon releasing the refrigerant and gauge went up to 40 and the compressor is back to behaving normally. It seemed to work ok for a while, then I started to have the same issues. 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. 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. As I was adding the freon into the A/C system, I heard a popping-like noise and noticed that the compressor kicked off. When the A/C clutch would turn off so did the radiator cooling fans. I am having similar problem with my 2000 Avalon, and would like some specific help. The A/C was cycling on and off every few seconds. 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. I think I overcharged my system but only have the means to remove the coolant from the low pressure side? 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. Compressor Failure. Thanks I think my Dodge Ram 2500 Diesel is got this exact issue. Thanks! 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. If it does not, shut the engine off and disconnect the negative battery cable with a socket. All the forums and posts I saw indicated that people that had this problem had no cooling coming out of the car. He got that replaced and also replaced the serpentine belt while he was at it. Everywhere I turned, people said that if the compressor was cycling on and off quickly, that meant the compressor was low on freon. So I took it down to a guy I know that works on cars for a very affordable price. 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. of freon” You need to have it all removed (freon) and pull a vacuum for 30 min. Solution: Refrigerant leaks can be dangerous, call a local HVAC company to find and fix the leak. Thanks for the info and confirmation . I have a 2004 honda civix ex. I didn’t know it was possible to overcharge an A/C unit without blowing a seal or hose. This switch is located on the metal canister next to the compressor. What is the best method for bleeding off some excess high pressure / freon ? This saved me so much time, money and headache. Wow! Posted in Uncategorized. General procedure to remove and reinstall a/c compressor clutches. 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. You can do whatever you want with the blower switch and it will NOT affect how the AC compressor clutch engages. AC Clutch kits are in-stock and available for all makes. 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. The pressure can also vary with the RPM of the car from what I noticed too. I would welcome any ideas and suggestions. Then get a scale and weigh in the exact amount of freon. Im dealing with the same thing. Onto Google I went. Can the freon be expelled from any side? I added a reply to you but not in the proper spot. 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. & the AutoZone guy was being nice and helped me add it. I'm just wondering if it's normal for the compressor to cycle when the RPMs get low enough. Very good information for the DIY car guy/gal out here. 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. As deal, I requested the seller to check the gas system, and they did it. Tried Recharging A/C and hear a hissing sound. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. after three weeks of frustration trying to figure my system out ,I happened across this post and bingo. I know this is an old article but it just helped me big time. 5. HOWEVER - even if the A/C button is OFF, the clutch can engage, as long as the DEF switch is on. When I took the car, the cold air was coming. Just turn the A/C on and you should be good. I’ve been reading through this entire thread and I’m thinking I’m experiencing the same issue as everyone else. 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. Took it back and told them what I experienced, so hopefully we can get it resolved. 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 you get that the air conditioning (AC) compressor clutch is not engaging in your car, you might need to get some answers. YOU SOLVED IT! Once I got to a safe pressure on the high side (225-250psi), I reattached the low side gauge. . I was thinking the pressure switch, but she states at highway speed, it works fine. Show More. Exact same happens to me. 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 car no longer cycled the compressor rapidly after taking some R-134a out of the system and it cools very well. Then, it happened again, and again! 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. 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’m certainly no expert but I’ve found this article is helping a great amount of people fix their issue. Then high pressure then started going down – then the compressor kicked on again. You said it goes from low to high. 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?). Discussion Starter • #1 • Sep 9, 2013. Thanks so much for saving me an embarrassing trip to the AC guy! 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 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. 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 . 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 . 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. After taking some out, the compressor stopped kicking on and off – and the high pressure then stayed fairly stable between 325 and 350 psi. So, the compressor was rapidly turning on and off still. It is low on freon and that is the reason for the cycling. Then, when your compressor is off, the pressure will rise again and it will turn back on. My 2005 Mazda 6 was having this cycling issue. 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. The cycling continued so he started looking into possible causes. I added freon, then going down the road it would cycle and pull the engine down very hard. I was fortunate enough not to damage my system, you may not be so lucky. it hit 350 – then 375 – then 400 – then just shortly after, the compressor popped and shut off. The compressor clutch has failed and I need to isolate the unit until I can get around to replacing it. When the switch goes bad, it will no longer be able to measure pressure and will leave the clutch engaged the entire time. Your A/C compressor clutch is one of the most important parts of a vehicle’s air conditioning system. Ford Fiesta 1.4 16v Year 2008 “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. Manny, Thanks for info too. Have an assistant turn on the AC controls to maximum. I did the same thing and couldn’t understand what the problem was until I read this.
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