Engine Size: 5.7
Refrigerant Type: 134a
Ambient Temp: 85
Back in Dec I replaced a leaking evaporator and also replaced the expansion valve and the receiver/drier then evacuated over night to check for leaks, added 3 ounces of PAG back into the system (10 ounce capacity with a dual system), and the system worked fin until a few weeks ago when suddenly the AC compressor would start cycling on for 3 seconds then off. Pressure readings showed very high readings both low and high side when the compressor would kick in for 3 seconds (80-100/350 - 400). When the compressor would kick in, I heard a vibration coming from under the hood that I couldn't quite pinpoint but it could be coming from the compressor. If we keep the a/c off or a few days, suddenly it starts working with vent temps at 50F (not the coldest but it stops cycling). After a couple of days, it stops working and symptoms repeat. WTF is going on here?
For starters check the clutch gap and pressures, not at the same time.
Pressures - see orig post
Gap check ok
High side intermittently going up out of control is usually something related to the condenser fan(s). When the compressor is pushing 450+ psi, there will be some noise.
Edited: Wed June 27, 2012 at 9:58 PM by mk378
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