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R-22 before R-12?

67vetteal on Mon March 30, 2009 7:14 PM User is offlineView users profile

Year: 1967
Make: Chevrolet
Model: Corvette
Engine Size: 327
Refrigerant Type: R-12
Country of Origin: United States

I'm helping another Corvette owner with the rebuild of his stock system. He has been told to charge with R-22 to remove all traces of moisture prior to charging with R-12. I've always understood that pulling Vacuum does this. Opinions please. Thanks, Al W.

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Working on our 67 Vette. Converting from STV A/C to POA system as it is correct for this year car.

Chick on Mon March 30, 2009 7:28 PM User is offlineView users profile

If you use R22 to charge the system, it's for finding leaks only, do NOT run the system with R22. It's fine for finding leaks with a halogen detector, nothing else.. Use dry nitrogen if you want to purge the system, but a GOOD vacuum will be fine..Hope this helps..

PS: Do not use R22 with PAG oils..it won't hurt the mineral oil used with R12, and I'm not sure of ester oils..

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Chick
Email: Chick

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