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Old 08-12-2017, 02:21 AM   #18
Bob B.
Senior Member
Join Date: Aug 2005
Location: Los Angeles
Posts: 945
Re: Factory A/C: POA Valve or Cycling switch?

Originally Posted by DT1 View Post
Is there a write up somewhere for the R134A re-calibration procedure?
I used these guys:

Sent my old valve in as a core, got one of their remanufactured and recalibrated for R-134A valves in exchange.

Yes, you can probably get by with a guesstimate valve adjustment, but you really should figure out exactly what pressure it is opening at, as others have pointed out in this thread. That's the best advise I can give you, good luck!
1967 GMC CM-2500 Camper Cruiser, 351E V-6, NP 435 4 speed, Dana 60, and factory A/C. 2012 GMC K-3500 WT regular cab, 6.0L Vortec, 6L90.
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