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2009 chevy trailblazer_ls
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5 Posts
Discussion Starter #1
Hey I have no power to Ac compressor at all. I have power to ac fuse but no power to relay in fuse box . I checked compressor its grounded but no pwer there does pcm control what power goes to ac. I have power inside of my TBlazer at switch. New compressor as well
 

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2004 gmc envoy_slt
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2,410 Posts
Not sure which HVAC system you have, but check the following fuses; underhood fuse box - fuse# 22 & 30, rear fuse box - fuse #36. If fuses are good and you have no voltage on both sides of any of these fuses, there is a problem with the fuse box or a wiring issue going to the fuse box. Attached are schematics for the manual system.
 

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