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Chevrolet
Trailblazer
279

Loss of One or More HVAC Blower Motor Speeds on Chevrolet Trailblazer

Problem Description and Possible Solution

The HVAC blower motor may stop working at one or more speeds due to a faulty blower motor resistor block. Our technicians recommend to confirm the resistor is at fault by first checking the operation of the switch.

Problem Data
RepairPal Verified
Average mileage: 112,363 (10,400–295,000)
7 model years affected: 2002, 2003, 2004, 2005, more2006, 2007, 2008
279 people reported this problem
Comments
Viewing 1 - 20 of 142 comments
Speeds 1-4 work, #5 quit today, nothing at all. After reading reviews and some internet searches on different sites, I've narrowed the problem down to a faulty resistor and purchased one online through Amazon. I'll let you know if this is successful as with others to remedy the problem.
my a/c blower does not go off even when my key is out of the ignition. the temperature gauge goes from 80 degrees all the way down to 10 degrees and back up again intermittently. Now my a/c says it's on full blast but nothing is coming out of the blower at all.
Mine does not blow air out unless it gets a suction. If I roll both windows down and then back up the heat/air will start working. I have also had the fan stick on high and not stop even after shutting the car off. We had to remove the fuse under the hood to get it to stop. I just read this and hope that changing the blower motor resistor under the dash will fix my issue too. If anyone else has had this problem and knows how to fix mine please help. Thanks
started having problems with blower motor not working on 5, the cluster for the dash gages and the fuel cap started causing check engine light to come on all problems seemed to start happening right around the same time
My damage all happened when my door shorted out and caught fire in wiring from my blower and air conditioner. Burnt wires up from the blower and on. My front vents do not blow at all. This happened during the same time when my door controls stopped working. And it shorted out my fuel gauge Everything shorted out. And none of it still works all but my door. I took it back on recall....... sure wished GM stood up for there products.
works fine on all settings, except 5 which is the highest. when I switch it to the highest speed its just like I turned it off.
I bought a new resister and motor. Everything works until 2 days later the resister burns out. This will do it repeatly. I have to keep buying a new resister each time.

But a kiwik kar, they told me I have a hvac leak that's going inside the filter near the resistor, could this be the problem? Or is it the harness?
I had this problem. Blower continued to remain on even after vehicle was shut off. Resistor was replaced but now my heating system for the second and third rows of the vehicle doesn't work. Heat and am to the front of the vehicle only.