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High "high-side" Pressure

A bad compressor does not pump 200, 300, or 450psi.  We at times her from a customer with an extremely high "high-side" reading, stating that their compressor is not working.  The compressor is nothing more than a pump; all it does is pump the refrigerant through the a/c system.  If your "high-side" reading is high, the compressor is working.  Check temperatures at the condenser inlet and outlet and gauge the readings.  It is likely a restricted condenser or a bad expansion device is causing the high "high-side" reading and not the compressor.  If this is the case, then you will need to replace one or both of those items.