Question about 2001 Oldsmobile Silhouette

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No air flow from defrost vent on my van.

Blower works. Air is directed correctly to dash and floor. When defrost is selected, blower runs at all speeds but no air flow at the defrost vent. Heat works well too. New thermostat recently installed. Thanks in advance.

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  • Falcon15 Jan 10, 2009

    Thanks Lymand. I think you're probably right. I reduced fan speed to lowest setting - then switch from panel to defrost mode - waited 5 seconds and then cranked up the blower. When I did this, I got airflow in defrost. If I switch from panel to defrost without reducing the fan speed, I get no airflow in defrost so your vacuum idea makes sense. I wonder if it's a line issue or a switch. Any way to tell? Do you happen to know where these are located? Thanks.

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Could be a vaccum line leaking not changing the vent flap to defrost

Posted on Jan 10, 2009

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