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91 7490 A/C Press Specs for R12 700 1991

posted by  someone claiming to be Dans on  Wed Jul 13 13:23 CST 2005 [RELATED]

Can anyone give me the operating pressures for the original
GM based A/C system in my wagon?
LP
HP
Since the car is 14 almost I don't want to upgrade the A/C to
R 134 but I do have a 1 lb can of R12 that I stashed away
ages ago and thought of topping up the system.

Pressure now is about 20 psi on the low side, not sure where the HP
fitting is....
Thanks
Dans






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