1991 gmc 1500 blower motor doesnt work

Yes it could be a fuse, or the blower motor, or the control on the dash.

The "A/C" Fuse, a 25A fuse, controls the A/C and Blower Relays. Pulling this will remove power to the blower motor.

Inside the wiper motor there's a little computer circuit board. That's most like is your problem. Replace the wiper motor and you should be good.

what does the harness look like where you plug it into the resister??? there is a repair pigtail for this fix.... the other problem most likely resides in the controller on dash. easy replacement,,,

If its not near the blower motor, it may be on the hvac box on the firewall in the engine compartment. It depends on if it has ac or not.
They are usually behind the glove box mounted in the side of the heater box.

Sounds like your controller is bad. http://www.resistorguide.com/applications/blower-resistor/ <Read this info.
http://www.ebay.com/itm/88-94-GMC-CHEVY-TRUCK-CLIMATE-HEATER-CONTROL-93-92-max-SILVERADO-SUBURBAN-SIERRA-/381127684906

The blower motor is on the passengers side under the dash.You might have to remove the a lower panel.This is the insulator panel.If the blower works at all just turn it on and follow the noise.Hope this helps.Good luck.

replace blower motor...but first check wires on blower motor see if u have power if you do then blower motor is out

did you replace the speed control resistor near the blower motor?

i have been having that same exact problem with my 2002 grand prix for over a year now, and when my ac is on the lower setting the it doesnt work plus the headlights and lights on my dash go out. On Max everything works. i changed the blower resistor(about $35), still doesnt work. i changed all relays and fuses related to the ac, still doesnt work. i changed out the actual ac control switch in the dash, still doesnt work. i have changed everything but the blower motor and have asked every mechanic and auto parts retailer i come across and no one knows the answer. The best answer i got is that it is probably a wiring problem like a short somewhere.