Heater whistles

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

  1. dutzowmo

    dutzowmo New Member

    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 New Member

    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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