Re: A/C System pressures
If you have a sight glass, I suspect that the receiver/dryer may not have been changed out for one compatible with R-134. Can you post a picture of it? Also, the AC depends to some extent on ram air flow. When I work on AC systems and the pressures go up, I put a box fan in front of the radiator to increase air flow. This will drive the high side pressure lower. In a pickup, the evaporator being small isn't necessarily a bad thing, since the cab is so small, so the efficiency issue is reduced.
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~Steven
'70 Chevy 3/4T Longhorn CST 402/400/3.56 Custom Camper
Simi Valley, CA
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