I have used dry nitrogen to pressure test the A/C system in my vehicles when doing service work. However, I don't do it often enough to remember all the details.

On my Dodge truck, if I pressurize the system to 70 psi, even just the high psi side, the low psi side will equalize to to the high pressure psi. Is this normal or a fault of the compressor reed valve or some other?

Thanks,

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Brian Toscano