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2004 gmc
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AC shop manual pressures:

Static: 60F/50PSI, 75F/70PSI, 90F/100PSI

Typical running conditions from a chart:

76-85F, under 35% RH, low side 30-42 PSI, high side 150-190 PSI
96-105 F, under 20% RH, low side 41-53 PSI, high side 240-280 PSI
 
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