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air from dash vents when heater is off

90longbed

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1990 ranger non a/c 2wd.....when driving down the highway with the heater completely off, you can feel air coming out of the dash vents.... no issues with hot or cold, so I am guessing its not the blend door.... any ideas???
 


Bronco638

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Is it really coming out (with pressure) or just kind of "leaking" out?
 

adsm08

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If the recirc door is in the open (fresh air/Vent) position that will happen because you are getting a ram air effect through the cowl.

In my 87 at 55 MPH I can get it coming in almost as fast as the high speed of the fan.
 

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