Diagnosis And Testing - Blower Motor: Vibration

WARNING: This page is about a different car, the 2003 Dodge Dakota. However, it is still accessible from the selected car via links, so may be relevant.

Possible causes of blower motor vibration include:

Improper blower motor mounting
Improper blower wheel mounting
Blower wheel out of balance or deformed
Blower motor faulty.
Foreign material in blower wheel causing unbalance