2006 GMC 1 ton heater fan not working

The blower wheel is plastic and sometime bends enough to strike the case. The speed resistor for the fan motor may be open also.

Problem need a heater/ac fan motor, which is around $25. If you still have problems then you need to replace the relay switch.

Yes, the heater fan does have a fuse. If the fuse isn't blown, there's a sensor in the duct work behind the glove box under the dash that controls the fan speeds that you can check.

fan control switch

This was the procces on an 86 chev 1/2 ton. Should be the same. Remove glove box. Undo manual controls for duct work. you'll see them there behind where the glove box was on top of the heater core housing. Bemove screws/bolts. Don't remember how many there are. Undo hose clamps in the engine compartment. Remove heater core.

check fuse,blower motor relay and blower resister(mounted in blower box) and blower motor

replace the resistor 4 the blower motor that should slove that hope this helps

fan blower speed switch under hood usually in fire wall or in heater box under dash area if you do not change it you will keep losing all your speeds until nothing left! it is not!!!!the one in your dash that you hand operate! hope this helps.John

Could be a fuse..but more than likely you need to replace the blower motor

it sounds like the fan speed switch ...but im no expert