70 psig on the low side, w/ compressor running sounds way too high to me. I usually see 15-40 psig, depending on the temperature and if fan is running. If the engine is off, after pressures equalize 70 psig is about right on a 70 F day.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans