Question about 2004 Chevrolet TrailBlazer

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On my 2004 trailblazer the A/C won't divert air flow from the floor vents to the dash vents

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To the Chevy Trailblazer....The HVAC system on your vehicle has small blend doors (About 4 by 3 in.) in size ...these doors will sometimes stick or the plastic rod hinge that it rotates on will break and it will not redirect the air flow..You could double check connection at the switch and for spot wear...sometimes it
also be the ( BLEND DOOR MOTOR/ACTUATOR ) This is what opens and closes the doors..It is very important to know the exact problem...To save money BEST thing to do is take to a dealer and tell them to scan your HVAC system and describe what I have stated...The dealer TECH 2 scanner will tell you exactly where the problem is...I worked for GM 2 yrs. I have changed blend doors before, sometimes you have to remove dash and that would cost very much so it is best to know exactly where problem lies....It could be the motor or switch which would be a little cheaper.....I hope this helps .Metalpoet

Posted on Mar 13, 2011

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BLEND DOOR MOTOR/ACTUATOR usually make a clicking noise (in dash by you right knee) if it's bad.

Posted on Apr 08, 2011

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