Question about 2004 GMC Sierra 1500 Crew Cab
HI this probably isn't the switch its the blower motor resistor. The resistor is located in the heater box by the blower motor. You will need to remove the lower trim from under the passenger side dash. Unplug the electrical connectors from the resistor and then you will remove two screws holing it the can be either 8mm or 5.5mm I have run into both. just pull down and towards you to remove the resistor it may stick at first dur to the gasket material. Good luck
Posted on Aug 28, 2010
It sounds more like the Motor Speed Resistor that is switched into the circuit for the lower fan speeds is the fault because the resistors are bypassed when high speed is selected. The resistor is a small unit that is located in the output air ducting adjacent to the blower motor. It will have a push on connector with about 4 wires going to it. To acces the resistor remove the connector & undo the screws holding the resistor pack in the duct. The resistor pack should have 3 wire coils of varying sizes attached to the little turrets on the pack. They may be chocked up with dust or leaves that has caused them to overheat & burn out as they can get quite hot even during normal operation.
Posted on Aug 28, 2010
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Posted on Jan 02, 2017
SOURCE: 4 speed blower (fan)
You'll have to go to the dealer and buy a new switch panel. There is a circuit board behind the switch panel that went bad on yours. Don't get one from the wrecking yard, I made that mistake once.
Posted on Aug 11, 2008
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