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Hib Halverson
Technical Writer for Internet & Print Media
No pressure differential on the high and low sides both with the a/c on can mean a bad compressor, BUT only if the center hub of the compressor is turning and not every tech will check to make sure that it is.
You state the compressor hub was turning with the a/c on, was this with the a/c not cooling? If so then it could point to a bad compressor, or a low Freon charge, just enough Freon to engage the clutch but not enough to cool the interior.
The compressor hub was turning but the HVAC was blowing ambient temperature.
Generally speaking a compressor does not go bad without making an audible noise first, or work intermittently on and off, but stranger things have happened. Bad clutch coils or low Freon levels are usually the case in that scenario.
The compressor was not making noise, but if it was and the noise was subdued, I would have never heard it over the engine. The compressor was not clutching/declutching intermittently. The clutch was either engaged, or if I turned the HVAC off, disengaged.
Looks like I won't have to drop the front cradle to get it out. I can remove the air bridge and the water pump, then unbolt the compressor, unscrew the one stud, and slide the compressor forward. Disconnect the hoses and lift out the compressor bringing the bolt and stud with it.
I'm going to replace the compressor the condenser and the two charge valves.
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