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Re: My 2006 GMC sierra 1500 heater fan stopped working....
This is your blower motor regulator. It is under the glove box and behind the blower motor itself. They are cheap to purchase but a pain in the rear side to replace. Hope this can help you out sir.
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cooling fan is activate for many reasons like engine hot, A/C high pressure, if there engine code and so on
does check engine light is on?????
hope it helps
High speed on the blower fan does not work thru the resistor. There is a seperate circuit that sould feed 12 volts directly to the motor. If you have access to a schematic it would help. The connectors for the high speed, burn out a lot. If you cant find I could look it up.
did all speeds stop working or does it have high only? if none of the speeds are working then you need to verify you are getting voltage to the motor, if you have voltage the motor is out, no voltage check the heater control relay. if it blows only on high then its the blower motor resistor located in the duct work under the dash around the glove box area
1-4 speed are the blower motor resister . It controls all 1-4 speeds, also it's under the passanger side dash around fan, the 5th speed runs off a fuse the is located in the fuse box. It's one of those square fuses , not the relays but fuses. The resister will run $15 and fuse $5 . Good luck. I have replace these before
The resistor is most likely bad but should still work on the highest setting.Would check pigtails to the resistor and to the blower motor for burnt or discolored wiring.You can try tapping the blower motor and wiggling the wiring harness too see if it will work on the highest setting. It is possible that the blower motor is bad as well typically when you lose the speed selection it is the resistor but you should always have high speed.
If high speed went out first, then it is the switch. There is the most arcing in the switch at high speed. If there was motor or relay trouble, it would effect all speeds. If there were problems with the ballast resistor, it would effect lower speeds.
The problem is probably the blower motor resistor. I'm not sure where yours is located exactly. They can be on the firewall under the hood or some are near the blower motor under the dash.
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