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I have a 97 GMC Sierra and want to vaccum the AC System, ...

Sent to Car Experts August 19 11:03 AM

I have a 97 GMC Sierra and want to vaccum the AC System, which direction do I turn the gauge knobs on the High and Low AC compressor fittings, (not the Gauge knobs)?

Thanks.

Billy

 

Optional Information:
1997 GMC Sierra 350

Already Tried:
I have connected the gauges and lines and want to make sure that I have opened and closed the right knobs,

Customer (name blocked for privacy)
Status:  Closed   Value: $9
Answer
August 19 8:47 PM (9 hours and 44 minutes and 24 seconds later)
         
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