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Possible cause for a "no pumping" compressor ?

coldkeeper1 on Thu July 24, 2008 10:06 PM User is offlineView users profile

After a lot of frustration, I finally learned how to rebuild a SELTEC TM16 compressor that I received as a gift....in pieces!!! Was I surprised when right after finishing the assembly process, I discovered that there was neither suction nor discharge action while turning the clutch plate. After rechecking the entire assembly looking for some missplaced gasket, etc. I looked more carefully at the pistons heads and cylinder walls and found well defined scratches patterns in both. Since the pistons have no rings, is it possible that these scratches are preventing both suction and discharge to occur due to leakage through the scratched surfaces? Are these scratches evidence of an insufficiecy of oil ?

GM Tech on Thu July 24, 2008 10:33 PM User is offline

The scratches would account for minimal blowby-- your problem is probably a misbuild- you have a reed in wrong - a head rotated, a valve plate rotated- something of that nature- believe me, I've done that- even after it was on the car until I figured it out..

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The number one A/C diagnostic tool there is- is to know how much refrigerant is in the system- this can only be done by recovering and weighing the refrigerant!!
Just a thought.... 65% of A/C failures in my 3200 car diagnostic database (GM vehicles) are due to loss of refrigerant due to a leak......

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