Posted by Brian Jasper co. Ia on May 06, 2009 at 19:47:30 from (67.142.130.22):
In Reply to: Re: A/C help again posted by 440roadrunner on May 06, 2009 at 09:41:26:
A plugged expansion valve will NOT cause high high side pressure. It causes low pressures on both sides. If there is little refrigerant getting into the evaporator, the compressor doesn't have anything to work with and therefore the low side goes very low and the high side is also low because very little heat is created. 10 to 15 psi is normal on TXV systems that use a thermostatic switch to control compressor operation. When I retrofit to 134, I start with 50% of the R12 capacity and do much like Jon does.
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