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Old 05-22-2003, 07:52 AM
BobK BobK is offline
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Join Date: Nov 2001
Location: North Central Kentucky
Posts: 1,068
Actually it could cool with zero psi on the suction side. Remember that is gauge, not absolute pressure. So it really would be 14.7 pounds of pressure. In other words, there still would be some freon there. With an undercharged system and reving the engine, it is quite possible to see the low side presure drop to zero, but most manifold gauges on the low side go down to 30" vacumn. Biggest problem would be icing the evaporator at that low pressure. That's why they have a low-pressure cutout switch in the system.
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