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#1
08-26-2025, 04:29 PM
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R4 compressor system
I'm Frankensteining an R-134A AC system together for my 65 Grand Prix. R4 serp belt compressor taken from a 1980s Buick (R12 compressor), turning by hand it has some resistance but feels OK. Evaporator is custom fitted in, its a new part from Rockauto for a 2005 Mitsubishi, with a new expansion valve on it as well. 2 pin pressure switch also new, open at 28 psi and 455 psi. Condensor from a 90s Chevy van. Thoughts..will the system work? Anything missing?
1. Does the compressor need a muffler\dryer with R-134A? It had one in the Buick but Im not using the Buick refrigerant lines nor R12 refrigerant. 2. Can the pressure switch directly handle the clutch coil current, or is a relay needed? 3. I believe the R4 compressor has no oil reservoir, where is PAG oil added?
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Red\black 65 Grand Prix 467 E-head stroker, Viper T-56 6-speed, 4.10 spool |
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