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Stephen Hawthorne

Stephe ... 8/23/2011

2006 Saturn Ion-3 Base 4 Cyl 2.4L

Body & Interior

I.ve recently noticed a thumping noise coming from behind the heater/AC control area. It stops when recirc. button is on

41,000 miles. Occurs intermittently, more often than not. Depressing the air recirculation button stops the thumping. When the air recirculation button is off the thumping returns, sometimes immediately, somtimes a short time later. No check engine light or other warnings accompany the thumping.

1 Answer


john 10/6/2011

There is a vacuum controlled flap for switching from outside to recirculate. If the vacuum motor or the hose fails, it will thump or make noise.


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