I have a 2004 TrailblazerLS in which the heater blower dont blow any air out. At first it only worked if you set it on 3 or higher, then it only worked if it was set on 5 and now it doesn't work at all. I don't know what to check or where to find what I need to check. Can anyone help me?

 

*Moving to GMT 360/370 Tech*

This is commonly caused by a failed blower motor resistor pack.

To replace it, you will need to remove the hush panel under the passenger side dash. The resistor pack will be located next to the blower motor and held on by 2 7/32" screws. Next, open your glove box and empty it. Then lift up on the stop arm on the driver's side top of the glove box and swing the glove box down and out of the way. This will give you access to the electrical connector for the resistor pack. Unplug the connector.

Reassemble reverse of disassembly with the replacement resistor pack.