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Thanks Hugh.
Didn't think to look for air coming out the high side. That would be a simple way to see if the pump is working. Unfortunately, I'd have to waste a can of R134 to do it.
The 911 does not have a high/low cutoff. The compressor clutch does engage when the a/c is turned on in the cabin - which it was.
I checked the other service hoses and they are open. They don't have valves in them, so I doubt the service hose for the center has one either.
Any other ideas?
Hal
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