Blower fan didn't work on setting #1 on Silverado. #2 thru #5 did. Suddenly while on fan #2 the fan jumped to #5 and continued to run even after turning off ignition. Only way to stop fan from operating was to disconnect the harness at the blower motor. After unplugging the harness the motor stopped but as soon as I turned the dial on the dash the motor went to #5 and had to do the unplugged all over again to make motor stop. What goes with this????

03 - 06 Silverado/Sierra blower stays on with key off (how to ...

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The HVAC blower in this 2003 Silverado stays on speed 5 even with the key off. Here's how to turn speed 5 of the blower off(while keeping speeds 1-4) and ho. ... How to replace blowermotor resistor in Chevrolet Silverado - Duration: 5:06. ... 2004Tahoe rear brake service (replace pads, clean/lube slides, ...

Blower motor won't shut off. - Diesel Place : Chevrolet and GMC ...

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Jan 10, 2008 - 11 posts - ‎7 authors
I have read through many posts on blower motor issues but no one had the same issue I have. ... If I shut the truck off, it still won't shut off and runs until the battery is dead.... 2002 GMC Sierra RCLB 1500 4X4 SLE, 7 1/2' Fisher plow.

Question - Blower Motor Won't shut off ' Chevy Truck Forum ' GMC ...

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if you got heat on all speeds and the blower motor is working properly then you probably need a new HVAC switch.

switch has failed and needs replaced would be my suggestion....good luck...

Hello koral_farver,

One common problem that fits your description is a bad blower motor resistor.

Below i will include an image of the location of the blower motor, removal and installation instructions.

The blower motor resister is under the dashboard behind the glove box.


1. Remove the glove box.

2. Disconnect the connector labeled 2

3. Remove screw labeled 3.

4. Remove the resistor labeled 1.

5. To install reverse order.

With what you have done so far by jumping the fan, installing a new switch and checking the fuses this will but you back in business.

Regards,
netvan

It sounds like the blower motor resistor is going bad. It's located near the blower motor. I would also check the connector going to the blower motor resistor.

The connection at the blower resistor on these model years had problems with poor connections.
The increased resistance on the terminals caused them to heat up and burn. Some would go open circuit and not work at all and some would short to ground and run all the time, like yours.
As you have already discovered, you will need to replace the pieces.

resistor (or blower fan module) is bad

under the passenger side dash, right above floor board there is a wire connector. That connector is for your blower resistor. If you unhook it, the blower will stop running, hook it back up and you will have a blower. You can also remove the fuse. Point being you can use your truck. Order the new part and replace it. I can't remember how many wires went to it off hand, its rectangular, mayber 6-7or 8ish.

If it is working at all then the relay and fuse is good and the problem is either the little vacuum hose on the back of the control switch panel or the panel itself.

you have a bad Blower Motor Resistor, you will most likely have to get this from the dealer, and it is located right around the blower mounted to the blower housing. Good luck and don't forget to vote. Thanks