GM Repair Problems? Ask GM Repair Expert Now.
Hello I will help,
The blower speed control transistor under the dash next to the blower motor has shorted and needs to be replaced. There is a sound panel under the glove box that you remove and you will see the bottom of the blower. Follow the wiring to the transistor next to the motor, unplug it and remove the screws holding the transistor up in the blower case. The pull it down and replace.
Let me know how I can help you with this