Mechanics

CHEVY KNOCKING NOISE

2008 Chevrolet Impala

Air Conditioning problem
2008 Chevy Impala 6 cyl Four Wheel Drive Automatic 60,000 miles

When you click to open the care and turn on and off the air conditioning it make a knocking noise it only last a few minutes then it stops, but whenever you turn the air conditioning on and off it will start the knocking sound again.
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Louisiana
November 5, 2010.



Sounds like the blower motor fan is rubbing on the cowl around it. Sounds like it is in the left dash area?



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