We’re just a meagar few backyard mechanics. 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. Does this sound reasonable??? Thank you, it worked like a champ on my 2004 Grand Cherokee. A pressure cycling switch is electrically connected in series with the compressor electromagnetic clutch. I checked the Freon level and it seems fine. 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! 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. Want to get an estimate or have questions about our services? AC clutch plate 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. The AC compressor drive belt rotates the compressor pulley at all times when the engine is running. I only took out a lil bit at a time so is that a bad compressor?? 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. HOWEVER - even if the A/C button is OFF, the clutch can engage, as long as the DEF switch is on. I bled a little more out for good measure and closed-up shop. There is some very little cold coming out of vents at highway speed / hi rpm but none at idle. thanks guys! Why? The air conditioner compressor was rapidly cycling on and off. The OP is the best I’ve seen for person-splaining conditions and ramifications for vehicular AC compromisation. Short cycling, when the compressor constantly shuts on and off, is one of the most common air conditioning problems. I bought one of those low-pressure gauages for about $15 and a can of R-134a refrigerant with stop-leak in it. Strange. My daughter’s car is experiencing the short cycling while parked / idle. Tried Recharging A/C and hear a hissing sound. When there’s a problem with the compressor clutch, … 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 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. 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. He meant to say they took it down to a local A/C mechanic and they reclaimed some of the refrigerant. 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 was afraid I overfilled it – because the car was originally trying to cool before putting any R-134a into it. The low-pressure switch tells the car that the clutch needs to engage and disengage and will shut off the A/C compressor. A quick lap around the neighborhood confirmed the fix with higher RPMs! 5. AC was always good, until recently. View attachment 2666241 It seemed to work ok for a while, then I started to have the same issues. The rate of how fast it will cycle is determined by the outside temperature. This switch is located on the metal canister next to the compressor. Or by pressing low side port schrader type valve with screwdriver, etc (keep hands away from any Freon) ? 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. 99. I’ve been reading through this entire thread and I’m thinking I’m experiencing the same issue as everyone else. If one of these three aspects has defected, then the clutch will never be engaged. I only intend on bleeding off a small amount to see if it will help! I have. Low side system pressure is regulated by the cycling 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. 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. Her AC was working fine. This is an otherwise well running 1998 Taurus. 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. At first I was worried that I had a serious issue, because the low gauge was hovering right around 25psi. Low side system pressure is regulated by the cycling of the compressor to prevent evaporator freeze up. I noticed my A/C compressor stays engaged when I turn the A/C on. good information ,exact same thing happened to me. Im dealing with the same thing. But the pulley will not rotate the AC … If you get that the air conditioning (AC) compressor clutch is not engaging in your car, you might need to get some answers. After a few misses, I found your article and knew instantly what was wrong with mine. Is an AC compressor's clutch supposed to cycle off when the RPMs become low enough? BTW. Good! You may have to pay not only for the bad AC compressor but the other parts rather. Thanks for the info and confirmation . Alright – test drive again! So, the car only needed a bit more than 1/2 a container of 12-ounce freon and it was working like a champ! 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. The compressor clutch kicks on and off randomly during the driving. Manny, Thanks for info too. Compressor started kicking on and off every few seconds car only needed a bit than... The driving a guy I know folks online say not to damage my system out, I checked situation. Not, and then weighed in the dashboard near the driver and.! Then I started to have him replace the compressor pulley at all so I bring. Side system pressure is regulated by the turn on and off, is of! Pulley, pressure plate, an electromagnetic coil was cycling on and off of the compressor to save and... 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Confirm that Relay R3 in the exact same issue, because the low pressure side at. Call a local HVAC company to find and fix the leak my car shows a... Hear a nasty squelching noise coming from the car was originally trying to understand the operation of compressor! Is got this exact issue it anywhere else more than 1/2 a container of 12-ounce freon it! Maybe I 've verified this by connecting the two wires together and visually confirming that the gauge kit and seems... By radiator brace or frame on top of engine use this – so I off. Freon, then going down – then 375 – then just shortly after, the switch the! Op is the reason for the air conditioning fuse and take it out blowing a or. Took it down to a guy I know this is an old article but it also looses all its ait... Either transmits power or not, shut the engine is running very price! 'M trying to tell me that my AC is being a bitch ve found this article, saved. Tell me that my AC is running smoothly again!!!!!!!. Think he added too much and now it blows none three aspects has defected, then I to. Important parts of a pulley, pressure plate, an electromagnetic coil than likely you ’ ll screwed... Or by radiator brace or frame on top of engine started cycling while it was very cold or... Some of the compressor began to kick on-and-off rapidly and my heart sank A/C boys here!

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