Question about 2002 Chevrolet TrailBlazer

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2002 TRAILBLAZER no rear heat. Rear fan works only blows out of lower vents. Will not switch to upper vents even on AC. Have heard clicking sounds from somewhere in the rear. Radiator is full. This has not worked for over a year. Have read all of the posts about this problem and triedpullinf fuses. not sure which fuse so have pulled 13,36,39,44 one at a time with no luck. So far seems like no one has the answer.

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Hello! One of the Blend Door Actuators is defective...There are three different Actuators...See picture #1...I would suggest that The Mode Door Actuator is defective...It is DORMAN Part # 604115...Cost = around $50..It is on the lower left side of the pictured HVAC unit....The part is shown in picture #2....After replacing The actuator...Pull the heater fuse...Start the engine...Run for 45 seconds...Turn off key...Replace fuse...This allows the computer to learn the new part...Guru...saailer




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Posted on Jan 03, 2011

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It depends on how the controller for the switch that changes the directional flap is controlled. Is it electrical or vacuum?Probably electrical so the motors bad or the gears are broke you will have to take some things apart to fix it yourself.

Posted on Jan 03, 2011

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AC works fine at first then stops blowing thru dash vents and will only blow thru defrost and floor vents. this is an 02 chevy trailblazer. It this an expensive thing to fix?


It's most likely a vacuum line, look under your hood (close to the cowl panel) for a disconnected, cracked or broken vacuum line.

In some rear cases, it could be the vacuum switch (in dash). Or vacuum diaphragm (under dash).

Hope this helps you ???

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Rear a/c heat vent do not work


Sounds like the flapper valve for the rear heater/AC core is not doing its job to send the air through the AC core when called for.

Another clue of this is the fact that the air is coming out on the lower vents when it should be up high fro AC.

Have someone listen back by the fan inlet in the back usually on the right while you switch between AC and heat to see if they hear any noise or change in air flow.

Worst case is that the interior panel there has to be removed to service the assembly behind it.


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