Question about 2006 Chevrolet Trailblazer

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Changed the battery out and now the ac will not

I changed out the battery and the ac does not come out the front vents. It does change when you change the positions just not the front vents.

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  • Contributor
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Does the air blow at all, that is the first question? If so, then it may be what the last response was, just stuck in one position. If not, then check the fuses, if the fuse is okay then there is only a couple more things to check. Pull the passengers side cover off under the dash, beneath the glove box, locate the blower motor relay/resistor and disconnect the plug (hopefully the plug is not melted to the switch). Use a test light to see if you are getting power from the fan speed switch. If you are getting power from all speed positions then it may be the relay/resistor switch bad or a bad blower motor, but you can rule out a bad blower motor by testing it seperately and if it works then it's the relay/resistor switch that is bad.If it is melted, Chevrolet had issues with this part going out from the beginning and said they had it fixed and canceled a recall in 04. Seems the ground is not sufficient enough and causes the wire to get hot, melting the plug and relay/resistor switch losing the ground and causing the blower not to work. Haven't heard of any trailblazers burning to the ground from this problem but it does cause a bit of a headache since the parts isn't cheap, plus you have to buy their wire harness and plug for about 100.00 and fight putting everything back in since it's up under the dash. They have pleny of feet room and that's just what it was meant for, your feet, not your head, shoulders, and arms. Hope this helped if not maybe it will for someone else. I had to deal with this myself on my 05. Thanks, Dale

Posted on Aug 09, 2009

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  • Master
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Check the a/c vent door behind the dash board, check to see if there are jamed

Posted on Jul 29, 2009

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I recently had the same problem with my 04 Silverado 2500HD after I replaced the battery. I am guessing that you have dual climate contol. You need to reset the climate control. I reset mine by simply shutting the AC off when truck is running and parked. Then turn off the truck
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It worked for me.

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