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How do you Change, Replace, or Install Broken 2002-2009 Chevrolet Trailblazer AC Heater Fan Speed Control Resistor Replacement

Fits years: 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009

All Chevrolet Trailblazer for sale Tools required:

  • 7mm socket/ratchet

  • 7/32 socket/ratchet


NOTE: For this installation, we'll be working beneath the glove compartment, on the underside of the dashboard near the PASSENGER'S feet.

Step 1: Loosen and remove the 7mm bolts (2) that secure the trim panel to the underside of the dashboard on the PASSENGER'S side of the vehicle.

Step 2: Remove this panel.


To fully remove the panel, you will need to pry the wiring harness retaining clips from the panel. We'll reattach them later!

Step 3: Disconnect the wiring harness (1) from the underside of the fan speed resistor.

Step 4: Open the glove compartment and disengage the latch that holds it upright. Let the compartment swing downward, exposing the blower motor mounting area.

Step 5: Disconnect the wiring harness (1) attached to the lower, RIGHT-HAND side of the blower motor.

Step 6: Loosen and remove the 7/32 mounting bolts (2) that secure the speed resistor to the vehicle. You can now remove the fan speed resistor.

Step 7: Mount the new fan speed resistor by tightening the 7/32 mounting bolts (2).

Step 8: Connect the wiring harness (1) to the underside of the new fan speed resistor.

Step 9: Connect the wiring harness (1) RUNNING FROM the fan speed resistor to the blower motor.

Step 10: Re-engage the lever that holds the glove compartment in the upright position.

Step 11: Tighten the 7mm bolts (2) that secure the trim panel to the underside of the dashboard.
These Part Change / Installation Instructions Apply to:

02 2002, 03 2003, 04 2004, 05 2005, 06 2006, 07 2007, 08 2008, 09 2009 Chevrolet Trailblazer Replacement Instructions

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