Weird Sound with Recirc on - Saab 9-5 Bulletin Board - Saabnet.com
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When the heat is blowing in my '04 Aero it's normally pretty quiet. But when I get stuck behind a stinky diesel and I switch to recirc mode to keep the stink out I can hear the recirc engage, and it works the way it should, but it makes a continuous buzzing sound like a leaf stuck in the blower motor, pretty loud. The sound is fan-speed dependent. Then it goes away when I switch recirc mode off. I'm not really sure how recirc works, does a door close that might push a leaf or twig into the fan? Thanks.
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