The a/c on my 1995 S4s is not cooling. That is the R134 system like a V8. We evacuated the charge and refilled with the proper amount of 1kg. With 1kg in the system we got normal high pressure but zero on the low pressure side. If we overfill the system we get a bit on the low side but not much and the compressor cycles rapidly, not surprising. There are no leaks, it holds vacuum just fine.
This sounds to me like a blockage. The service manual doesn't have much info. Is there an inline filter? Might a bad receiver/dryer cause this problem? I hate to look at the evaporator given its almost impossible to get at, and the normal failure mode for an evaporator is a leak, not a blockage. Is there an expansion orifice that is serviceable?
Any air conditioner experts here?
This sounds to me like a blockage. The service manual doesn't have much info. Is there an inline filter? Might a bad receiver/dryer cause this problem? I hate to look at the evaporator given its almost impossible to get at, and the normal failure mode for an evaporator is a leak, not a blockage. Is there an expansion orifice that is serviceable?
Any air conditioner experts here?