HVAC fuse # 44 30 amp located in the rear fuse box , Do you know where that is ? Doesn't you blower work on any speed ? Separate fuse for high speed . Blower fuse 35 40amp fuse in the under hood fuse/relay box. engine compartment .
Fuse Block - Rear
Beneath the left rear seat
Good luck !
SOURCE: 2005 GMC Envoy SLE blower fan speed #5 is not working
More than likely this should just be your resistor. You have different sized coils on the back of your resistor for all the different fan speeds. if one of them burns out or breaks then that certain speed will not work.
SOURCE: where is the blower motor located on 03 GMC Envoy
the blower is located behind the glove box.
SOURCE: How can I disengage a fan blower that won't shut off in my 2005 GMC Envoy?
Find & remove the fuse or relay
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