I have a 2006 gmc envoy and the fan dosent work on high all other settings work except high
Fan blower speed switch under hood usually in fire wall or in heater box under dash area if you do not change it you will keep losing all your speeds until nothing left! it is not!!!!the one in your dash that you hand operate! hope this helps.John
The blower motor resistor controls fan speeds ,gm has had problems with wireing harnness to resisistor
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lost higher blower fan speed a couple of months ago and now have no blower speeds at all.
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