Re: Obsessing over my AC 134 conversion
Proper procedure would be to drain all the oil from the new compressor and discard. I assume your 4 Season compressor is a Denso style. It needs about an ounce of oil. The evaporator, condenser, POA and drier? Another 5-6 ounces. Very likely the new parallel condenser holds more refrigerant and is more efficient so I wouldn't reduce the charge from factory recommendations.
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My Classics:
'72 K20 Suburban + '65 Dodge Town Wagon
'72 Corvette Roadster +'67 Corvette Roadster
'73 Z-28 Camaro
'63 Ford SWB Uni Pickup
'50 Ford Coupe
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