Question about 1997 Ford Expedition

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My air conditioning compressor cycles rapidly on and off making a clicking sound when I turn on the front defroster.

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Check freon and cycling switch.











TIM

Posted on Dec 30, 2010

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1 Answer

The heater/AC fan makes a clicking sound when it is in deforst mode.


the ac compressor cycles when you have the defrost on that is the clutches on the air compressor

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I have an 04 Ram and have heard the same sound. Mine is actually refrigerant gurgling when I have had it on defrost. When defrost is used the air conditioning compressor cycles. They do this so oil will be circulated through the compressor during winter months. Keeps the clutch and everything working and keeps seals from drying out.

Feb 05, 2011 | 2004 Dodge Ram 1500

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WHEN THE AIR CONDITIONER OR DEFROST IS TURNED ON, MY ENGINE KILLS.


Inspect the air conditioning compressor for being siezed up. Not the clutch on the front, but the actual compressor. I suspect it is the problem.

Feb 25, 2010 | 2003 Chevrolet TrailBlazer

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I I have a 98 plymouth breeze i get a swish sound


The AC Clutch is going and is slipping, thus the swishing sound..sorry. When the Defrost or AC is turned on the Clutch is Engaged. And yes the AC Unit replacement is recommended over trying to have the Clutch replaced. Most mechanics won't even try rebuilding an AC Unit.

Jan 13, 2010 | 1998 Plymouth Breeze

2 Answers

Compressor doesnt run.


There is a pressure switch on the accumulator. The compressor cyles according to the low pressure reading at the accumulatror. If there is low refridgerent pressure the switch stays "OFF" and wont turn ther compressor on. Whan a system is low, there will be rapid cycling of the compressor, (on and off every few seconds). When the system is charged with the correct amount, the pressure is related to the temperature of the refridgerent. The compressors are common to leak. So it it doesnt leak, or make knocking noises, the compreesor MAY be good, but a pressure gauge will tell you if the compressor is good or bad. If you keep having to charge it, thats bad, and there is a leak. You will need to find and repair the leak, replace the drier (accumulator) , and recharge the system.

Nov 09, 2009 | 1997 Ford Explorer AWD

1 Answer

Air conditioning on the front window is blowing all the time


Yes , when your in defrost mode, the compressor runs, and adjusting temperature control up a little, may get you through. When you go to heat mode, compressor shuts off. The idea of the compressor running is that it assists in removing moisture(humidity) to speed up the process of defrosting.

Jun 03, 2009 | 2000 Chrysler Grand Voyager

3 Answers

Air conditioning blowing hot air


ok could be one of 3 things. 1 you may be out of freon. (proly spelt that wrong) 2. compresser could be bad. 3 the clutch on your compresser might not be engaging. when trucks running turn ac on and see if the front of your compresser spins or not. if it does clutch is good. but it could be that your compresser is still bad. either way i recomend you go for freon and start there. when they fill it they will tell you for sure wether or not your compresser is bad.

Apr 29, 2009 | 2004 Ford Explorer

1 Answer

Idle Revs With Front Defrost


when you use the front defrost in the winter the cycling of tha a/c compressor will cause this condition.

when you use defrost the a/c is run to de-humidfy the air that is blown onto your windshield.


in the summer this is not a big deal as it is hot enough outside to keep the a/c system pressure above the compressor clutch cycle threshold. but in the winter the general lack of heat in the ambient air and the lack of humidity results in rapid cycling of the ac compressor.

the idle is bumped up to compensate for the load of the a/c compressor, or else your engine would stall out. but when the compressor is disengaged the idle is dropped. but it raises again when the compressor cycles back on.

there may be a good chance that your ac is under charged after all these years. when the weather gets warmer have the charge level in your ac system checked.

a low charge will also increase the on off on off cycling of the ac compressor, usually resulting in the complaint that you have. so the base issue of your problem is low ac system charge.

Apr 11, 2009 | 2000 Jeep Wrangler

1 Answer

A\c compressor , defrost


That is actually the design of Honda defrosters. The air conditioning system by design dries out the air in the car. To increase the efficiency of the defroster Hondas automatically turn on the air conditioning. This dries out the air and de-fogs the windows.

Mar 12, 2009 | 2001 Honda Civic

1 Answer

02 envoy - "A/C on" indicator (front defrost) causes power loss.


the a/c will always turn on with defrost so the hot air wont crack a cold windshield.it sounds like altenator not keeping up. have it tested.if the engine realy boogs down with the a/c turned on the a/c compressor might be bad.(locking up)

Dec 29, 2008 | 2002 GMC Envoy

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