Improving efficiency of factory ac system in '67 GTO
Prior to removal of the engine and the A6 compressor I run the system and it cooled 'okay' on a 75 degree day with the fan on high but I don't see it working well once we gets up to 90s here in NC later this summer. Are there any ways to make the factory system more effecient? Not sure if it was running r134a or good old R12 when I removed it and I don't know if the POA valve was changed if it was running r134a I did read a thread here recommending changing the fan out to a more modern unit to increase air flow. What should I consider when reinstalling the system to get max cool air?
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