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Variable fan speeds not working

CAMAN

By CAMAN
in Automotive Information Sharing

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CAMAN Grand Master

CAMAN

Posted
Posted

My 05 Chevy Colorado just recently started having problems with the HVAC blower. The fan speed switch works intermittently. Sometimes it works fine then it will cutout and only work on high. I can flip the switch back and forth a few times and it will run fine for a bit then cutout again.

Does this sound like the switch is bad or is there a relay or resistor somewhere else that has gone bad? And if it's a relay or resistor where would it be located?

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Jeremy airjer W Grand Master

Jeremy airjer W

Posted
Posted

Without having a wiring diagram in front of me I would be hesitant to fire a resistor at it. The resistors either work or they don't work. There is no in between. I'm not exactly sure what they use to control fan speed but I will check tomorrow unless somebody else does before that.

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Scott K Grand Master

Scott K

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These had problems with the blower motor drawing to many amps and burning out the resistor.

But I agree with airjer, when it goes bad, it is bad. I would check the ground wire for the resistor. If you need to just tap a new ground wire into the existing one and see if the problem reoccurs. It is pretty much a free fix if that is it.

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Shack Grand Master

Shack

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Posted

Quote:
The resistors either work or they don't work. There is no in between.

This is true. Same as a light bulb, or is it "really" the same. grin Could the resistor be broken but touching on occasion and then not? Like broken filament in a incandescent light bulb touching and then not when moved? The ones I have seen that burn out melt away a good distance and will never touch. If it is cracked I could see this happening.

Could be the connector at the resistor? Could be melted or burnt. I would rule out the blower motor if it is working on the high (12v) setting all the time?

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CAMAN Grand Master

CAMAN

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I started diging into it the other day and started following the wires to see if I could find the resistor. As I approached what looks like the main power cord (4 large wires) for the fan it started going haywire as I jiggled the plug. Unplugged it and saw a little white corrosion on one of the contacts. Cleaned it up as best I could and its been working flawless since. I'll be getting a little dielectric grease to throw in there, but hopefully that was the only problem.

Thanks for all the input guys!!

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