Re: AC High/Low Side Help
The valve on the left of the picture, evaporator pressure, is for a third gauge, or use the blue low pressure gauge and swap back and forth from the suction side of the compressor.
The smaller valve on back of the compressor is the high side. You would have to get an adapter to adapt from 1/4 inch fitting, low side size, to 5/16 inch fitting, for the red high side gauge.
Be sure you get an elder HVAC tech who has worked with POA system. POA keeps the evaporator between 30-35 PSI, suction side on compressor may go into a vacuum if working properly. Most HVAC techs are too young to know, or only worked with residental/commerical A/C and know nothing of a POA or STV from Ford. Not saying they couldn't learn and mentor others, but, POA is a type evaporator regulating valve.
If you converted to R-134A, major change. POA valve would have to come out, new hoses, change compressor oil and receiver, and convert to orifice type system, not that hard, as in late model design after 1988. Plus a system flush of every component. Labor would be your biggest expense.
Just my thoughts.
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Last edited by Everett#2390; Jul 30th, 07 at 07:48 AM.
Reason: Had the wrong size for the high side, Thanks, Tom!