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Air conditioner compressor keeps cutting on and off - plenty of feron in system - air system not cooling

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  • toneman2121
    toneman2121 Jun 06, 2010

    did you recharge the a/c system? what is the capcity of refrgerant for your vehicles a/c system? did you check for leaks? a contiually cycling compressor normally indicates low refrigerant.



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Have the system checked with a set of ac gauges,this is the only way of telling if there is enough freon in the system,and what is going on inside the system that is making it not cool,it can be a orifice tube,that is stopped up too.

Posted on Jun 06, 2010


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My air conditioner is not working on my 2005 Nissan quest se. what may be the problem? it was working fine yesterday. there is plenty of antifreeze

anti freeze has nothing to do with air conditioning
shaking at speed is , tires, wheel alignment, suspension parts or balance and again is not related to air conditioning
working one day and not the next suggest a leak in the ac system and now the low pressure switch is not allowing the compressor to work
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take the car to an accredited auto ac specialist shop and have it checked for leaks and gas
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Dodge caliber 2007 air conditioner blows out some cold air but not much have enough ferone in it was told might be sensor

If it is not blowing out enough cold air it appears you may be low on refrigerant. The latter will cause the compressor to short cycle with resultant warmer than normal output temps.

Aug 10, 2015 | Dodge Cars & Trucks

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This must be one of those disposable guage/can things.Are you really going to trust a disposable guage?If the clutch wouldn't engage at all,and after adding some refrigerant,it engages erratically,it's probably still low on charge.Keep adding refrigerant while the system is running,until the compressor cycling becomes more normal.I like to place a box fan up against the grill to blow air over the condensor,to simulate the air flow created by the vehicle driving down the road.This lowers the temperature and pressure of the high side,allowing the refrigerant to flow in faster.You might also want to put a thermometer in the center dash duct to monitor the duct termperature.

Jul 14, 2012 | 2003 Ford Escape

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The resolution to your issue depends on the results of many things, the four MOST important is the low and high pressure readings AND the temperature at the condencer and the evaporator. A system full of refrigerant will not cool, and a system low on refrigerant will not cool. There is a balance that must be achieved....

Mar 24, 2011 | 2003 Chevrolet S-10

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Air conditioner stopped cooling. Dealer diagnosed evaporator leak, replaced the evaporator assembly, expansion valve, drier, evacuated and charged the AC system. One week later, AC stopped cooling,...

It could be that there was more than one leak and the dealer found only one. The AC system has two pressure switches to protect the compressor from damage---a low press. switch cuts off the compressor when there is not enough refrigerant in the system, the high switch cuts off when pressures get so high they could blow out the seals. Both are a result of a leak--refrigerant leaks out and air can leak in. Air will compress and when it does, it gets hot--so no cooling, and pressures go way up. So the compressor may have been stopped by those protective switches.

Of course, there could be a bad relay or other circuit malfunction.

Another possibility is that the compressor sat too long before being repaired (but we are talking about weeks going by here, not days). The air and moisture (humidity) that leaks into the system during this time creates acids that will attack the metal reed valves in the compressor. On restart, the damaged metal valves eat themselves in short order. If this is the case, the compressor ran until it seized and will need to be replaced. This particular problem is impossible to diagnose. So the dealer may have done his best.

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Air conditioner starts blowing cold air then blows warm

This is most likely the cycling of the AC unit. As the compressor pressurizes the 134a Freon you get the cold air, once it reaches a certain pressure it cuts out. If you are low on Freon it will cycle out more often. Check your freon level with a gauge to see if your within the proper tolerance. If the compressor runs for a period and doesn't reach the right pressure it will cut out to keep from damaging your compressor so it is important to keep the correct amount of freon in the system.

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1994 camry air conditioner works good when outside temp is around 80 but at 85 to 90 it doesnt cool

you may need a feron charge make shore nothing is on the passenger side floor hope this helps CJ

May 20, 2010 | 1994 Toyota Camry

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has the charge been tested< these suffer from leaks, have the system leak tested and then repair and recharge.

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1998 Crown Victoria air conditioner

Fuse 9, 50A under hood, Fuse 5 15A Instrument panel. If they're ok, make sure the compressor clutch can be turned by hand (engine off, obviously). If not replace the compressor. Most common problem is the cycle switch. That should be the electrical connector on top of the accumulator. Just jump that by backprobing the connector on both sides with a pinand connect them, with the car on and a/c on if the compressor clutch engages, replace the switch. If it doesn't, try wiggling wire harness and watch it, if it engages, find a broken wire and repair it.

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A/c blow hot air then cool air been doing this about two weeks now.when compessor turns on shakes whole car. and turns off and on every 5 to 10 secs a/c never gets cold i just filled it with feron and used...

Just to make sure you have the right reading, the low side should be 30psi to 50 psi and the high side should be 150psi to 200 psi, Any other readings will give you poor a/c performance and if it's to high your going to have system damage. The other thing to is your a/c pressure switch may be bad and that's along the low pressure hose or on the accumulator (Air Dryer) It looks like a oil pressure switch with two wires clipped on to it. If that has gone bad it will give you the same on, off or stay off all the time. You can un clip the wire from the pressure switch and jump it and see if the compressor stay's on, if it does. Replace the switch and you can do it fast enough that you won't loose that much R134a. If your still having the on, off with the jumper wire to the pressure switch, replace the a/c relay. Good luck and hope this helps, keep me posted, be glad to get you running cool again.

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