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I have an 04 Trailblazer and just had my battery replaced as well and a 125 amp fuse. The mechanic at the dealership told me we blew the fuse because when we jump started the suv, we crossed polarity. I told him we didn't but he wouldn't check the dash vent fuses without another labor charge so i am stuck with frozen feet and frosted windows for a few weeks! I was hoping to find an answer!

The same problem happened to me when I replaced the battery. I too have an 03 Trailblazer. The AC works great through the defrost and the floor, but no vent! I'll keep looking for the answer. I hope someone posts the solution fast. It gets hot in Texas. Same here...'03 therr are two answeres to this problem posted on this site my best solution is to pay a dealer.

You need to replace the HVAC mode actuator. This is found under the dash. Trailvoy.com has additional details on how to replace this. Do a search in their forums. They have answers to almost anything dealing with Trailblazers and Envoys.

2010-05-18 00:53:55
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