Blower fan shuts a door when on high.
10

Asked by Mike Feb 16, 2024 at 03:58 AM about the 2004 Pontiac Grand Prix GT2

Question type: Maintenance & Repair

Hear fan blows air normally on low to mid range, but on high you can hear a
door shut. Checked both motors any they are functioning properly. Any ideas.

3 Answers
157,615

James answered 9 months ago

Most likely a broken door. The defrost door is a common one to break on GMs. Hope that helps! Jim

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10

Mike answered 9 months ago

I bought the car about week ago so don't know to much about it. Found that the blend door motor must have been replaced at one time. I found the the motor was working backwards so when you increase the temperature the door was closing. Took the motor apart and reversed the connection and it works fine

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