What is making this unusual noise and where does it come from?
Asked by Sherwin2015 Nov 30, 2015 at 09:04 AM about the 2008 Chevrolet Impala 1LT FWD
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
Check the shield around your catalytic converter it may have broken free...
Sherwin2015 answered 8 years ago
Forgot to tell you car is in garage, not running, and no one in it. we open the door and bingo it goes off.
Sherwin2015 answered 8 years ago
Not the catalytic converter. car not running when it starts making the noise when we open the door.
Sherwin2015 answered 8 years ago
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
