Question about 2005 GMC Sierra

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2005 GMC SIERRA - HEATER BLOWER WASN'T WORKING - CHANGED THE RESISTER - BLOWER WORKS FINE - PROBLEM IS THE 5TH SPEED DOESN'T WORK - IT TURNS OFF - IS THERE A SEPERATE FUSE FOR HIGH SPEED?

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  • Brian Crozier Dec 31, 2010

    where is the high blower relay?

  • Brian Crozier Dec 31, 2010

    can't get the #5 speed switch to work - it did have a bad resister - chandged it.. 2005 gmc sierra

  • Brian Crozier Dec 31, 2010

    ok, so the high speed relay is with the resister, with that being the case, then I must have bought a bad resister, correct, tomorrow I'll exchange the resister I bought from nappa. Do you think it should fix the problem? thank you!!

  • Brian Crozier Dec 31, 2010

    I checked the 40 amp fuse for the blower under the hood it was good

  • Brian Crozier Dec 31, 2010

    well, I changed the resister just to make sure that wasn't the problem. still #5 blower switch doesn't work - checked red and orange wire for power - yes - power is there. when i turn the switch to 5 the fan turns off and the resister clicks off - on and off on 5 is a clicking sound from the resister - or should i say the high speed relay. 40 amp fuse good under the hood marked blw - also checked the 30amp fuse in the fuse box in the cab--- no clue. when i checked the blower to make sure it was good i jumped a red and black wire to the blower - ran fine. any clue?

  • Brian Crozier Dec 31, 2010

    fluke meter - 12vdc

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  • Master
  • 1,168 Answers

Hello Brian.
Yes, you are correct, there is a separate fuse in your Sierra.
It is in the underhood fuse panel marked "BLWR/ECAS" and is rated at 40 AMPS.
All your other speeds go through the resistor. The high speed is energized on a separate circuit through a relay that is part of the resistor you replaced.
It is possible that when the resistor went bad it shorted out that fuse.

There you are, glad to be able to assist you today.
Thank you for using FixYa.

KL

Posted on Dec 31, 2010

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  • FUBAR Dec 31, 2010

    No Brian............. I believe you have a bad fuse in the panel under the hood that goes to the relay.

  • FUBAR Dec 31, 2010

    If the fuse is good, verify you have power at the relay you replaced by checking the red wire for battery voltage.
    If that is good, then check the orange wire for power with the fan set on high (key on).
    Both should have power.....check that out and let me know.

  • FUBAR Dec 31, 2010

    Brian, what type of tester are you using to check power?

  • FUBAR Dec 31, 2010

    Could you recheck the voltage using an incandescent test light?
    I am suspicious of a poor connection in the circuit. ...A poor connection will show 12 volts on a multimeter, but there will be no amperage available

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  • Master
  • 3,113 Answers

High blower relay.

Posted on Dec 30, 2010

  • honeymokey
    honeymokey Dec 31, 2010

    Close or next to resistor.

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