I replaced the blower motor- no change in noise. It sounds like a heater/defroster door dragging or a motor that won't stop on a diverter door. The plastic housing under the dash vibrates when it squalls.
SOURCE: a/c blend door
blower motor is hitting on the casing more than likely.it could be wearing out or the bearings going bad in the motor
SOURCE: 99 blazer clicking noise under the dash
try checking your blend door actuator ,,,it may be stuck or defective..
SOURCE: a/c blower motor for 2003 corvette
Yea leafs and other debris can get in and cause the noise. Remove the blower, thoroughly clean the fins and reinstall. This should take care of the noise.
SOURCE: blower stopped working
Bad blower motor resistor.Remove plug & look to see if the plug is burnt/melted on any contacts.Also check the pigtail that plugs into blower motor.I only had to replace my resistor.
SOURCE: 2008 chevy impala making
This link will help you out. Just copy and paste the link in your browser.
http://www.denlorstools.com/autoblog/2010/08/impala-loud-clicking-noise-in-dash-car-repair-article/
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