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Discussion Starter · #1 ·
Hi all.

I’m unfortunately unable to get my A/C compressor (which was replaced with the past 12 months) to kick on in my 2005 Tahoe with automatic HVAC.

My OBD tool shows low pressure, but bypassing the low pressure switch still doesn’t cause the a/c compressor to engage and blow cold air. I’ve tested the relay for the compressor, as well as both the compressor and HVAC fuses (all tests were nominal). I’ve also tried replacing the HVAC control module, but it seemed to make no difference. I’m able to grant permission to the A/C, but it still won’t cool.

What should I be checking next?
 
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