Question about 1998 GMC Sierra

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Heater fan don`t work and the fuse is good

I put in a new fan but still don`t work

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You need to check your wiring to the motor and ascertain if you have a positive and negative feed to your motor to see if your motor is ok, see if you can put a feed directly to the motor to prove it, if the motor runs you have a wiring problem elsewhere

Posted on Feb 16, 2009

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I just put a new heater blower on my car there is power running to it but it wont turn on


DID YOU HOOK UP THR GROUND WIRE .. IF YOU DID YOU STILL PROBILY DON'T HAVE A GOOD GROUND SO MAKE SURE IT GROUNNDED WELL YOU HOOK A JUMPER CABLE TO THE NEG SIDE OF THE BATTERY AND THEN TOUCH THE OTHER END OF THE JUMPER TO BARE METAL ON UR NEW BLOWER IT SHOULD START IF YOUR GROUND IS BAD MAKE SURE YOU HAVE YOUR FAN SWITCH ON WHEN YOU CHECK THE GROUND ,,, OK CHECK YOUR FUSE AND OR RELAY IF THIS DON;T WORK .... BUT USSALLY ITS JUST THAT THE NEW MOTOR IS NOT GROUNDED GOOD ENOUGH ..

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If fuse good - could be a failure of the blower fan motor or blower control switch.
If fuse bad - bad blower fan motor could have blown the fuse.
DO: check fuse, then blower motor.
Pricing: new blower motor: Duralast PM270 $43.99
new heater control switch: Duralast SW229 $46.99 (without
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I'd expect your blower resistor to be good - when they fail, the blower only will work on HIGH setting.

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