A/C always on?
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Joined: Apr 2010
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A/C always on?
I have a 1993 with only 26,600 miles. 3L Auto, and A/C. The A/C clutch is always cycling no matter the position of the controls.
I have checked it out this morning, and I confirmed that with the heater controls all set to OFF, (lever, fan switch and a/c on/off), the clutch still cycles on and off. I pulled the a/c relay in the Power distribution center, which of course stopped the cycling.
The motor rpm increases slightly as the clutch engages, as it should, but What is causing the a/c to be continually on?
Iain
I have checked it out this morning, and I confirmed that with the heater controls all set to OFF, (lever, fan switch and a/c on/off), the clutch still cycles on and off. I pulled the a/c relay in the Power distribution center, which of course stopped the cycling.
The motor rpm increases slightly as the clutch engages, as it should, but What is causing the a/c to be continually on?
Iain
Last edited by iaing; Apr 30, 2010 at 10:08 AM. Reason: spelling!
Fleet Mechanic
Joined: Dec 2006
Posts: 1,338
Likes: 6
From: UPSTATE NY
if its cycling chances are its undercharged. the sensor senses a certain amount of ambient pressure in the lines, the compressor kicks on to bring the pressure to where it should be, then kicks back off, then kicks back on again when the pressure settles, and again the sensor picks up that it is not within specification. and the cycle just keeps repeating. but for it to run the compressor with the heater on is normal for dehumidifing the air for you when its cold and raining.
Post Fiend
Joined: Jan 2003
Posts: 9,748
Likes: 16
From: Connecticut
Is there a separate button for the A/C on the Control Selector Assembly? The actual switch inside associated with the button could be failed "closed". Also, keep in mind that, when Defrost is selected, the A/C switch is likewise engaged.
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mfcarpino
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Sep 8, 2005 04:31 PM
