The Under the Hood
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Dear Motor Medics, I have a 2005 Chevrolet 2500 truck with a 6.0 engine and automatic transmission.
Lately I have been experiencing a noise behind the dashboard upon starting. At first, I thought it was under the hood and searched for something that could make the kind of sound I was experiencing.
After much searching, I discovered it was coming from behind the passenger side of the dashboard. It is located just to the right of the glove box door and back by the firewall.
There is a box there that I assume is part of the heating system and when I touch it, I can feel the clicking in sync to the noise. This noise occurs each time I start the vehicle and lasts for about one minute.
Have you ever heard a noise like this before?
Dear Scott, Yes, we have heard this noise before and can help you. Most vehicles went to fully electrically-operated heater door systems in the late 90s. The door motors have position sensors in them and when they fail the computer does not know where the door position is. Because of this failure the door motor keeps moving when at the end of its travel. It begins to strip the gear teeth causing the noise until the module shuts it down at a pre-determined time limit.
To fix the noise you will likely need a new door motor. Thanks for the email Scott.
Take care, The Motor Medics
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