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R 12 And R 134 Compressor Valves

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An easy way to identify which refrigerant your Jeep came with is to look for a valve on the fitting at the back of the compressor (top). The older R-12 systems typically came with the compressor already pressurized with refrigerant and oil so the install simply required bolting the compressor in, attaching the lines, and opening the valves to charge the system. The blue cap on the R-12 fitting is a dead giveaway that it was converted to R-134A at some point in the past. The right fitting is from an R-134-only system.