2005 Chevrolet Colorado Logo
Posted on Aug 03, 2009
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A/C fan only works on #4

I understand that the resistor needs replacing and read somewhere that it was on the fan box located behind the glove box. The only thing i find there is an electrical connection. When I unplug the connectior, nothing works on the fan. When I plug it back together, only #4 works. Is the resistor under the hood? If so, how do I recognize it. Any help would be appreciated.
Charlie

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  • Posted on Aug 08, 2009
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The resistor IS the problem, but not by itself. If you change only the resistor, they will keep going bad and you will have the same problem again. Get a new resistor and also the plug & wire harness. This is experience talking. There is pin in the connector plug that burns up, which ruins both components. I have not had to mess with it since I replaced both components.

The resistor is located behind the glovebox. It is mounted with 2 screws. Changing the resistor is easy. The wire harness is different because the geniuses at the Chevrolet/GM parts division didn't bother to color-code the wires on the replacement harness. Be sure to pay attention to which wire goes where when you splice in the new harness.

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  • Master 2,841 Answers
  • Posted on Aug 03, 2009
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The Blower Motor Resistor Pack is indeed the problem. It is located inside the vehicle near the blower motor. The best thing to do is to go buy one and then you will know what you are looking for.

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