KNOCKING NOISE

2003 Pontiac Vibe

Tiny

kdbug

October, 8, 2010 AT 2:09 PM

Air Conditioning problem
2003 Pontiac Vibe Automatic 90,000 miles

when the fan is on outside air there is a knocking noise from inside the dash. When the fan is set for inside circulation the knocking noise stops. What could this be?

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Code Read Retrieval/Clear Chevrolet Camaro