The blower motor resistor is in the air duct right below the passenger side foot well. \if you remove the lower kick panel and drop the glove box out of the way you can easily access it for replacement. \you can follow the wire from the blower motor to the resistor location on the air duct.
Very common failure on these trucks however the replacement part is far more reliable.
www.trailvoy.com Trailblazer enthusiasts forum
where to find heater resistor 2004
i had a 03 Chevrolet Colorado, and the resitor was located under the glove compartment, where the motor blower is, the resistor is screwed to the side of the blower. hope this works for you. the resistor is usually located there.
the heater fan resistor is located under glove box beside the fan blower.
I need a diagram for the vacuum lines on a 2004 Chevy trailblazer
Check by or near the unit itself
The a/c heater blower motor resister is located in the vehicle on the passengers side inside the housing next to the blower motor...............Remove the blower motor resistor wire harness connector.Remove the blower motor resistor screws.Remove the blower motor resistor.
about 5 min.
resistor module is on the right side below the dash next to the heater motor next to the fire wall you will have to remove a kick panel by the glove box
The idle air control valve on a 2004 Trailblazer is located inside the coolant system. This valve regulates the air that comes into the cabin.
under each coil
The blower resistor assembly is located under the hood, on the heater case to the right of the blower motor. Haynes Manual #36071
Bad blower resistor?