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R134a AC system pressures?

posted by  someone claiming to be JohnB on  Mon Oct 21 01:36 CST 2002 [RELATED]

Book says evacuate and weigh the charge is only way to ensure correct fill.

That being said, a very rough guide to high side system pressure, assuming everything else is ok like no clogged expansion valve or condenser, etc., is twice ambient temp in F. At 85F high side should read no higher than around 170psi....at 65-70 should read no higher than 140psi.






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