Don't work on number 4 speed
Have u located the fuse as well as the relay? Bad switch?
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: I have a 2006 GMC Sierra with the electric dual
very common, ive done many. replace the blower motor resistor module, located next to blower motor and also plugs into blower, follow the wire from blower to resistor, heres apicture to help, napa auto parts sells this part,its about $50.00.hope this is helpful.
SOURCE: 2005 GMC Envoy XL High Speed Blower not working
if the other speeds work it is probably the blower resistor; if applies varying resistance to the voltage running the blower; this allows the fan to run at different speeds; should be located very close to the blower motor; behind a panel under the passenger side of the dash
SOURCE: FRONT A/C BLOWER MOTOR NOT WORKING ON 2005 GMC
First check and see if you have voltage at blower motor with key and switch on, with test light, if you do have voltage, blower motor bad, replace it, if you don't have voltage at blower motor, next to it, is where the blower motor resistor is at, follow the wire from the blower motor to it, check voltage there, should have voltage, if you do replace blower motor resistor, resistor cost about $45.00 at auto parts.If I can be of more help. please let me know.
SOURCE: 2005 GMC Envoy. Blower will not work all fuses
If this a manual HVAC system, the blower motor resistor pack is defective or the blower motor itself is bad.
If this is the Automatic digital HVAC, the blower motor control module is defective or the blower motor itself is bad.
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