Re: AC Question - Saab NG900 & OG9-3 Bulletin Board - Saabnet.com
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Re: AC Question
Posted by Hugh [Email] (more from Hugh) on Mon, 8 Jun 2009 19:21:22
In Reply to: AC Question, Sibelus, Tue, 2 Jun 2009 06:19:34
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500 psi head pressure is incredible! In fact, it should never even get there as the high pressure switch should open the clutch circuit and shut the compressor down until the pressure falls low enough (325-350?). Most R134a systems (cars 1994 and up) typically run 25-35 on the suction side and 225-275 on the discharge side under load on a hot day. If the pressure is spiking that high a restriction is the cause. I would suspect the expansion valve is stuck shut and not regulating. The compressor must be good if it will even produce a pressure that high!
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