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Thread: Heater problems

  1. #1

    Default Heater problems

    Hello everyone I am new to the site! I have been having some trouble with my heater and was hopeing that maybe someone could help me out. I have a 2005 chevy HD2500. My problem with the heater is that it only works on fan speeds 1,3,5 only and works about the same on them all.Also it blows air through mainly the vent and defrost no matter where the selector is at. Any help would be great and THANKS

  2. #2

    dwill3015's Avatar
    Join Date
    Jan 2007
    Yacolt, Washington
    Blog Entries


    Welcome to the site! The problem you are having is because you need to replace your blower motor resistor.
    Washington State
    2006 Silverado 2500HD LT3 4X4 CC SB Duramax LBZ
    Tuff Country 6" lift, 35" Toyo M/T's on 20" Ultra Peacemaker wheels, Quadzilla Stealth2 programmer, Diamond Eye 5" cat-back exhaust, factory Special order color Yellow.

  3. #3
    Jr. Apprentice
    Join Date
    Jan 2009
    Middlesboro, KY


    Quote Originally Posted by dwill3015 View Post
    Welcome to the site! The problem you are having is because you need to replace your blower motor resistor.
    I will have to agree here! Singel speed fan is almost always attributed to the resistor being shot in at least one of the resistors in the switch circuit.
    Not too familiar with GM's environmental system, but is this the way it behaves when the resistor goes out? Only blowing through vent/defrost? On Ford, it's usually a directional door motor or in the case of no heat the blend door motor...
    Live Life Out Loud but be soft spoken enough to listen to it talk to you! Then drive it like you stole it!:glasses:

  4. #4


    Thanks for the help. Where is the resistor at? I haven't really work on anything like that before. I know what they look like but wher edo I need to look.

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