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More A/C Questions[200/1987] posted by Tom Rolniak on
Tuesday, 1 June 1999, at 5:41 p.m.
You can tell it's summer by the number of A/C questions. Here's mine. Reputable service guy says I have a full charge, no leaks, compressors is fine on my R-12 system. He said it worked fine, after fixing the ground connection from the compressor. But when I turn the little rotary nob to the max position (or any other) all I get is a little (5 degrees F) temperature drop at the output and nothing more. I once had it really cool off for about 30 minutes then it quit cooling. The fan runs fine and the compressor clutch engages with a corresponding increase in engine speed. Fuse is new and in good shape. What's the deal? A/C relay, expansion valve, heat from somewhere, damper failure?
Thanks in advance.
Tom
Re: More A/C Questions[200/1987] posted by abe crombie on
Tuesday, 1 June 1999, at 9:15 p.m.
hot water valve or faulty exp valve.
Try vise grips on the heater hose and see if it cools, if so it needs a water valve.
If the vise grips cause no change then the system needs to be run for a period at high idle and see if the pressures go wacko ( like 50 on low side and 125 on high side indicating excessive opening of TXV or 0-10 psi on low side with high side at 225 or higher indicating the TXV is shutting down too much).
All this assumes you have a debris free condenser and a fan clutch that is working correctly.