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International Automotive Technicians Network
Re: High AC pressures...no leaks
Posted to Technical Discussion Forum on 5/17/2023

Hello Wycliff,

I have heard of incidents where the low side would pull into a vacuum then suck ambient air in past the compressor shaft seal. Usually, it related to a sticking expansion valve problem.

Remember the A/C system also operates when defrost mode... Login to read more.