Blower problems

[WickedYukon03]

So my 03 yukon only seems to only blow on high.... I have the digital control unit with auto climate control.... Is it the blower motor resister? Also is it interchangeable with a manual control unit?

 

[NathanJax]

Also is it interchangeable with a manual control unit?

No

 

[pnwdan]

It is your resistor

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