Malachi

I have a 2004 Trailblazer EXT LS with the I6.

I recently bought it and noticed that the rear blower is not working. I bought it anyways thinking easy fix.

Here's what I've discovered. Can not find any blown fuses. I have 5v power to the front switch. If I turn key on engine off and turn the rear fan on with the front switch and just leave it for a while, after about 10 minutes the blower will start working and run as long as I don't touch it. But, as soon as I turn the key off and back on, I have to wait 10 minutes again.

If I start the trailblazer and turn the switch on, I have let it run over half an hour and the blower will never turn on.

If I have the key on engine off and turn the front switch to R and the rear switch on, I hear a whirring noise coming from under the center console near the rear HVAC control panel.

I pulled the rear blower out and hooked it direct to battery and it works just fine.

I have checked the resistance in the front switch and also from the plug for the rear control module and the resistance is in specs with what I found on this thread

https://chevroletforum.com/forum/tra...working-42019/

Can anyone tell me either what's wrong or what else to check in order to find the problem?

Malachi

Anybody?

Malachi

Bump?

Mitch167

Hi Malachi, It sounds to me as if you have a (pussed) circuit somewhere. Where the wire connection is grounding through corrosion (puss) around the wire usually where the wires are held against the frame or body and rubbed a bit just enough to corrode.