Quote:
Originally Posted by Tim Hancock
Pressures should be equal with car shut off after sitting awhile. Upon star up and AC on, I would think low side should be somewhere in the 15-35 psi range and high pressures 150+. You stated your low is now reading 55psi when AC is on or is it still the 40/180 type figures. I don't know the "normal pressures for your car, but at 40/180, I would think you would be seeing some sort of "cool" air at your vents. The pressure differential bewteen your 40/180 numbers would lead me to believe your compressor is functioning.... maybe the tiny orifice in your expansion valve is plugged???
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Huh...... typed the above about 1/2 hr after downing just one triple Vodka/DietCoke after a bad Friday at work. Interesting to see the effect on my grammar and typing.
Matt, after thinking about this a bit, your problem is a bit odd to me as a plugged expansion valve would typically create very high pressure on the "high" side and very low pressure on the "low" side.
Are you getting even cool air in the vents? If so, maybe you simply need more 134. Sorry for the lack of a definitive answer.... I have ressurected several old non-operational auto AC systems in my old German cars, but I am no expert.