Fan Blower Issue

[RI95Tahoe]

I have a 1995 Tahoe LT with A/C. I unplugged the control head to test for power reaching it, and now the fan motor is on low and won't shut off unless I pull out the fuse. This is with the control head unplugged. Any ideas?

 

[SunlitComet]

so with fuse in but control head unplugged fan runs on low speed? should not be possible. would have to be a high resistance wire or high speed blower speed relay short if so.

 

[RI95Tahoe]

so with fuse in but control head unplugged fan runs on low speed? should not be possible. would have to be a high resistance wire or high speed blower speed relay short if so.

Guess I will start there then. I'll have to print out the schematic for it though....

Thank you for your help.

 

[white7wolf]

Maybe somebody can weigh in if there's a blower fan control module that could be bad. I'm not sure if the tahoes have one though

 

[SunlitComet]

these ones do not. the fan switch simply routes the power thru varying resistant routes determining the power that reaches the fan.