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Heater whistles

Discussion in 'General Chevy & GM Tech Questions' started by dutzowmo, Feb 11, 2013.

  1. dutzowmo

    dutzowmo Rockstar 100 Posts

    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?
  2. dpeter

    dpeter Rockstar 4 Years 500 Posts

    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.

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