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Diagnosis And Testing: Noise

WARNING: This page is about a different car, the 2007 Chrysler PT Cruiser. However, it is still accessible from the selected car via links, so may be relevant.

To determine if the blower motor is the source of the noise, simply switch the blower motor from Off to On. To verify that the blower motor is the source of the noise, unplug the blower motor wire harness connector and operate the heater-A/C system. If the noise goes away, possible causes include:

  1. Foreign material on fresh air inlet screen
  2. Foreign material in blower wheel
  3. Foreign material in HVAC housing
  4. Improper blower motor mounting
  5. Deformed or damaged blower wheel
  6. Worn blower motor bearings or brushes
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