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Thread: Heater whistles

  1. #1

    Default Heater whistles

    I have an 04 silverado and when I turn my heater it has a slight whistle or squeak to it. If I turn the fan up higher the whistle gets louder. Any ideas on what is causing this or a way to fix it?
    Ryan
    2004 Silverado
    20" Fuel Octane
    285/55/20 Toyo Open Country AT IIs
    db Exhaust by Corsa

  2. #2
    Sr. Engineer
    Join Date
    Oct 2010
    Location
    Indianapolis, In
    Posts
    487

    Default

    It may be the blower motor (likely). Does the pitch change with blower speed change or does it just get louder like a whistle gets louder the harder you blow? If it is pitch then I would replace motor, if it just gets louder then maybe something lodged in a vent causing it.
    2000 GMC YUKON SLT, 5.3L tow pkg, G80 rear/w 3.73 gear

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