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frequent A/C cycling
Posted by Erich (more from Erich) on Sat, 24 Jun 2006 00:15:40
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The air conditioning compressor on my car cycles very often and the car does not seem to stay as cool as it used to (maybe because it is cycling too often). I bypassed the overheat switch on the compressor and that did not make a difference. I measured the high and low pressure cut-off points using the procedure in the service manual and they are good. When I measured the air temperature 100mm inside of the center vent I got a reading that is COLDER than what is shown in the service manual. The manual says 6 to 12 degrees centigrade and mine varies from 3.3 to 6.2 as the compressor cycles on and off. Could my system be overcharged? How quickly should the pressure build up to the point the high-pressure limit switch disconnects the compressor clutch? Or is it not normal for the pressure to get that high?? I already did the evaporator anti-frost switch update some time ago.... made no difference.
Thanks, Erich
1994 900SE v6
106,000 miles
posted by 217.228.1...
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