In my 67 GTO convertible, I just finished installing an OEM POA valve that was rebuilt and recalibrated for 134, a new high flow aluminum condenser, new drier/accumulator, and new lines. 20 years ago I had just charged with 134, but it never cooled well. These changes made a drastic improvement…the center vent gets really cold to the touch….. haven’t put a thermometer on it yet….now I just need to work on improving the air movement… kinda get spoiled by the air flow in newer cars…
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