Automotive Air Conditioning Information Forum (Archives)

77Vetteluva on Mon August 20, 2012 11:44 PM

Year: 77
Make: Chevrolet
Model: Corvette
Engine Size: 350
Refrigerant Type: R-12
Country of Origin: United States

I have restored my Vette and it's time to reassemble the A/C system. I have serviced Residential and Commercial A/C systems for many years but am not familiar with auto. My question is: Should I be able to turn the compressor by hand with the clutch engaged? When I bought the car there was no refrigerant in the system so I don't even know if the compressor is good. I bench tested the clutch and it is ok but I can't turn the pulley with the clutch engaged. I would like not to assemble and charge the system if this is an indicator of a bad compressor. Also there was some white/gray looking stuff that came out when I flipped the compressor over. Almost the texture of thick ashes. Is this normal or another indicator of a failed compressor? I did seal the compressor and hoses while storing them to keep out debris.
Thanks
-Rick

Cussboy on Tue August 21, 2012 2:29 PM

Yes, you should be able to turn over the compressor by hand when the clutch is engaged, or just the center part; oftentimes by hand, but certainly with a socket/bar.

Out of curiosity, I spin compressor center by hand at the wrecking yard, can spin old ones by hand usually. A brand new one should be tighter, but should move with a wrench.

HECAT on Tue August 21, 2012 4:09 PM

Quote
Originally posted by: 77Vetteluva
Also there was some white/gray looking stuff that came out when I flipped the compressor over. Almost the texture of thick ashes. Is this normal or another indicator of a failed compressor?

It is definitely not normal. You could oil flush it (iffy); I would replace it.

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77Vetteluva on Thu August 23, 2012 8:16 PM

Thanks for the advice! I thought I would go ahead and install it in the car and try to turn it with a socket bar. I also think if got all of the debris out whatever it is and rinsed it out with mineral oil. BTW I still have 2 cylinders of R-12 and would like to use it. 60# I might could spare a charge to test it.