How can one test a car ac motor which is not hooked up in the car ac system, to determine whether it is working properly or not ?. In other words, how can you tell whether the motor you have just bought is working properly?
Make sure the pulley and compressor internals turn freely and quietly. Most compressors can be turned easily by hand except some like the R4 even a "good" one will be stiff. Apply 12 volts to the clutch wire and see if the clutch pulls in. If it's a fixed displacement compressor, it should build air pressure when you hold your finger over the outlet and turn it by hand. These are a some quick tests you can do but there is no way to detect all possible problems without putting it into an operational system.
Thanks for the info.
Would all 'good' compressors build pressure on the discharge port, and vacuum on the suction port, when the compressor is turned by hand? Or does the compressor have to be turned rapidly?
My compressor didn't build any measureable pressure or vacuum when bench tested by using my thumb to feel. In the car and running though the high side pressure looks good, the low side pressure look higher than it should, and cooling isn't great. I think my compressor is weak/leaky (Sanden SD505).
Variable displacement models need to be turned at a good RPM when bench testing. The Sanden 505 should show good results with a thumb over the port and hand turning.
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