Quote:
Originally Posted by VetteMed
Short cycling typically is either due to low ambient (outside) temps, or insufficient charge. A faulty pressure sensor also could lead to short cycling, I suppose, though usually this leads to a complete failure of the compressor to engage.
When you were told that there was plenty of 134a, did they connect a set of gauges to the system while it was running? What were the pressures doing when the compressor would disengage during the short cycling?
A three degree differential between fan on to fan off sounds too small to me, but I'm not certain if that's within spec or not.
Andrew
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He did have a pressure gauge but I can't remember what the pressure reading was when the compressor turned on. I can find out.
As for thefan on-off temp, this is Marc's chip and his website says 205 on 200 off. However, my coolant temp says 208 when it turns on.
Over the winter I had the system evacuated, replaced the condensor because of cosmetic damage - crunched bottom from an accident before I bought the car, and then had the same shop recharge the system. Could the system have been overcharged due to cold weather when serviced? Would an over charge result in short cycling?