air from dash vents when heater is off

[90longbed]

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]

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

 

[adsm08]

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.