What is making this unusual noise and where does it come from?

10

Asked by Nov 30, 2015 at 09:04 AM about the 2008 Chevrolet Impala LT

Question type: Maintenance & Repair

2008 Impala has unusual noise that sounds like a loud motorboat. Stays on for
about a minute. Starts when we open the door. Today we slammed the
trashcan lid and it went off.

6 Answers

108,005

Check the shield around your catalytic converter it may have broken free...

3 of 3 people found this helpful.
10

Forgot to tell you car is in garage, not running, and no one in it. we open the door and bingo it goes off.

10

Not the catalytic converter. car not running when it starts making the noise when we open the door.

73,035

It's just saying hi to ya!

20

mine does that when i adjust heat controls

Best Answer Mark helpful
10

Thanks for writing. Sounds like what I found. I figured out that the outside air damper for the heater was snapping up and down. I reached in underneath the incoming air filter and pulled the damper out. The heater works mostly o:k but not quite right without it. BUT the disturbing noise is gone. - Sherwin

1 of 1 people found this helpful.

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