Chevrolet Repair Questions? Ask a Chevy Mechanic for Answers ASAP
Welcome, I'm Chris (aka Moose).
Is it blowing heat or just blowing outside air temp?
When this occurs if you just open the hood and grab the AC lines at the firewall are they freezing cold?
What size truck is this and which engine?
Are you good with wire diagrams and electrical testing?
Not sure what 5/3 means
Is this a 1500-2500-3500 and which engine?
Here is your wire diagram https://www.dropbox.com/s/9b6f2nukszzqg2h/53ac.pdf?dl=0
The PCM controls the AC clutch relay. The PCM uses the low and high pressure switches for input and the HVAC controller for AC request. We need to know what the PCM is seeing from those pressure switches to see why it is no longer commanding the AC on. A scan tool is needed to do that. Normally I find a sticking high pressure switch to blame.
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