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Message: <blockquote data-quote="CPB" data-source="post: 29180" data-attributes="member: 12360">The pressure expected is dependent on ambient temperature, so check an r134a chart. It the clutch disengages and the compressor no longer spins, then pressure should rise.Some fake numbers as example. The high side will be around 175psi when low is 40psi. When the system is off it'll be at a static pressure. Meaning the low side can be higher when "off" than when in operation.</blockquote>