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Old 07-02-2021, 09:56 PM   #1
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Join Date: Jun 2020
Default Turning rebuilt ac compressor by hand?

Iím installing a rebuilt compressor and a coolant line on my project car. (Volvo 245) I can not turn the clutch by hand at all. It feels frozen. Should I be concerned and bring the compressor back to autozone before I bolt it up, or should I assume it will loosen up when turned by the car.
Iím pretty new to working on AC systems.
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Old 07-02-2021, 11:15 PM   #2
Join Date: Mar 2003
Location: Monroe, OR USA

The clutch pulley should turn easily by hand and so should the compressor shaft. If not, you have a problem.
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Old 07-03-2021, 09:58 AM   #3
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Join Date: Oct 2005
Location: Orange Alert, NC

Without power, you should be able to grab the pulley itself and turn it with a finger. It will not keep on spinning (small mass vs large bearings). Also while you spin; you do not want to hear scratches and grinding noises. The front of the clutch system is attached to the compressor. It will need a bit more force to spin (you are operating the compressor) but when you spin it slowly (how much lubrication is there?) it should feel smooth.

If you apply 12V to the connector coming out from the clutch, you should hear a click. Now the pulley will spin the compressor.
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Old 07-03-2021, 12:42 PM   #4
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Join Date: Jan 2019
Location: Sandy, OR

If the compressor is not bolted to the engine, this may be normal. It depends if the compressor still has the caps installed on if from being rebuilt. A lot of the time when compressors are rebuilt, they are pre filled with oil. Since air conditioning oil will absorb moisture, the compressor will be charged with nitrogen so the oil will not absorb moisture from the atmosphere. Also, they do this to check for leaks. If it has the caps, remove them slowly and see if it has psi. If it does, let the psi escape and then try to turn it. If it still does not turn, I would them return it. If not immediately installing it, re install the caps.
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