Question about 2004 Chevrolet Colorado

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A/C fan switch only works on high. When this first started it would work sometimes on the 3 other settings when it wanted to. Now it only works on high. The Dealer ship service department told me that it was probably the resistor. Because if it was in the switch that it would not work at all. I ordered and replaced the resistor and it did not change anything.

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  • Anonymous Aug 05, 2008

    i had the same problem its the wiring harness going through the firewall shorting out fan,had 2 fans to burn up before chev.figured it out...

  • jysaliba Aug 06, 2008

    I have the same problem with my Colorado. Took it to Scher Good Year, Burn another fan switch. I will be taken it to the dealer now.
    Thanks you.

  • Anonymous Aug 12, 2008

    My AC and Heater swich only works on # 4 setting

    No steps taken as of yet.

  • fitterbd Sep 06, 2008

    Fan only works on speed 4...

  • Anonymous Sep 09, 2008

    Have the same problem. I haven't had it looked at yet

  • Anonymous Oct 17, 2008

    same

  • coryfrias Apr 19, 2009

    I have the same problem on my 2004 Chevy Colorado it works some time on the first three speeds but then it just goes on then turns off. And it really works good on speed four?

  • Anonymous Apr 30, 2009

    the fan goes on 4 the high switch and after driving some the others my come on but never on all numbers. No#4 it always works.

  • Anonymous May 02, 2009

    Fan Only Works On High on My 2007 Colorado ! Will OCASIONALY work on the other speeds for only a very short time..

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The solution was replacing the plug leading to the resistor. It is part number pt1231 from acdelco. I highly recommend this and am 99% sure that this is your solution. thanks

Posted on Nov 06, 2009

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Yes

Posted on Sep 18, 2008

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I got mine checked out by the dealer they said it is the motor blower resistor is bad. It needs to be replaced.

Posted on May 23, 2009

Dealer Fix it. The wiring harness was shorting out going in to the firewall. Thank you all.

jysaliba@sbcglobal.net

Posted on Sep 18, 2008

I had the same problem. The reason your fan works on high is there is no resistor between the switch and fan motor. A three other speeds have a resistors or series of resistors in line with the motor. Low speed is series wired thru three resistors; medium is series wired thru two resistors; and medium high is series wired thru one resistor. I replaced the switch and all three resistors and things work fine.

Posted on Sep 18, 2008

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Check wiring harness had same problem had 2 fans to burn up before gm could figure it out...from what gm said wiring harness was shorting out going in to firewall several colorodo owners have told me they have had the same problem...

Posted on Aug 05, 2008

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