Tip & How-To about Chevrolet TrailBlazer

How To Replace A Blower Motor In A 2005 Chevy Trailblazer

Under the passenger side of the dashboard, remove the three 7mm bolts holding the lower plastic cover from the dashboard. Drop down the plastic cover and you will see a square box and 2 or 3 plugs holding to the cover. Unbolt the control box mounted to that cover and the 3 harnesses of wires attached to it, and move them up and out of the way. Look up towards the front corner, the motor is bolted up into the heater box. There are 3 small metric bolts, 4.5mm, I believe, remove those bolts, disconnect the electrical connection to the motor and remove motor. Check the motor electrical connector for any burnt over overheated wires. Alot of these trucks' original connector plug had too small of wiring, causing the power wire to get hot and melt the wire insulation and the plug it's self. The 7 wire plug from the Chevy Dealership is $67.00. You'll need to cut off the old plug and use the connectors supplied with the new plug to replace the old plug. I have seen the blower motor cut off going over a bump, and then come back on after hitting another bump, due to the fact that the individual connector gets hot and melts into the plug. You may also want to look at the blower motor resistor which is mounted right next to the blower motor, sometimes the blower motor resistor will go out altogether, not powering the blower motor, or not allowing the motor to run at a selected speed.

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