fan blower switch
fan only works on high speed.1-4 don't work at all.resistor is o.k..
fan motor checks out good.fuses are good. Did some resistance checks
and voltage checks everything seems o.k.. Can't find the problem....
need help. Any suggestions
Try replacing the fan resistor relay. go to your GM dealer parts dept and ask for the location on your vehicle.
common problem, change the resistor and your problem will be solved