Hello all. Been a while but I’m back again. Two weekends ago, I was changing the actuators in the rear HVAC system on my 05 Suburban LT. I also unplugged the blower control module/resistor in the process. When I plugged it back in, the blower motor was stuck on full blast. I turned the ignition off and removed the key and it still kept running. I’ve already had to replace the control module for the front system for the same issue so I figured that was the same thing. Ordered it and installed the new module/resistor this past weekend and even with the new part, it does the same thing, full blast even with the key off. Any ideas on this would be greatly appreciated. Thanks in advance.

 

The high speed relay may have welded itself shut, or a control module failed. See schematics on charm.li

 

Mountainmanjoe: looking at the schematics, I see where the module itself is but for the life of me, I can’t seem to find the relay for the rear system. Am I missing something?

 

Maybe. Post the schematic.

 

https://charm.li/Chevy%20Truck/2005/...-%20Auxiliary/

That’s the schematic I’m looking at. Sorry for the delay

 

well that's a drawing. You need the electrical schematic (wiring diagram)

 

How about I just ask the question as basically as I can. Lol. Would the relay be in the fuse block under the hood, or in the driver side of the lower dash? Is that the type of relay I should be looking for?

 

You should be looking for the wiring diagram. It's at the link I posted.

 

So, this box with the red and grey plug is the relay that is possibly bad?

 

Also, if I unplug both of the plugs, red and grey, the fan motor keeps running