Why is my car making a loud knocking sound on the passenger side of the vechicle ?

Asked by JSkrillz25 Sep 27, 2012 at 05:47 AM about the 2008 Chevrolet Impala LTZ FWD

Question type: Maintenance & Repair

It happens but is not limited to when I unlock the doors or I turn power
to on it only lasts about a minute or so. I also heard it happening when I
was just standing near the car without doing anything to it I didn't even
have the keys

3 Answers

Ceebdough answered 5 years ago

I had my 2008 Impala with knocking noise assessed twice. Both times the mechanics said it is the fan from heating or cooling. The Chevy dealership told me $1300 to fix. The first guy said it is common in this car and the only posaible harm might be its use of battery after you turn off the engine.

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GuruH7KQ9 answered 5 years ago

Got the same problem,,,it is the motor/gear of the a/c-heater air box damper,either going from outside air to inside,or adjusting to left side right side delivery

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