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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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German autos: '79 911 SC, '87 951, '03 330i, '08 Cayenne, '13 Cayenne
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