1998 GMC Truck Heater/AC fan motor

ROBERT_GLENN

MEMBER
1998 GMC TRUCK
V8
4WD
AUTOMATIC
145,325 MILES

I have recently replaced the heater/ac fan motor in my 1998 GMC K1500. The original motor quit working but before it did it made a sqeeling noise and would quit blowing. Since I changed the fan motor, it will only work on high. None of the other fan speeds will work. No blown fuses. Can you tell me what is wrong or what has happened and how to fix the problem? I have tried a different fan control switch and that didn't help.

Thanks, Robert_Glenn

1 Reply

ZACKMAN

MECHANIC
4,202 POSTS

It can be frustrating to replace a part only to learn that it doesn't completely fix the problem. If the fan is only running at high speed and no low speeds, it means that that your blower motor resistor is bad. It is located on the blower motor housing. PN 158788 $13.80 from rockauto.com