Fhobbs

I went through a car wash yesterday, the type that had blowers at the end to dry off the car. The car was rolling through on a track with windows fully closed.

As it slowly went through the blowers, I could feel something on my hair. A wind leak of some kind? Somehow I could feel an ever so slight flow of air across my head or ears or nose hair but definitely I could feel it.

I surmised the blowers must be blowing at a high speed, don't know if the speed is higher than highway speed.

Unless someone says it Is a pressure change condition or something, I can see how from somewhere, somehow, there is a wind leak into the cabin. Doesn't help me find it, but now I am convinced it is not my imagination.

robert1408

I would guess it's just the air stream blowing in through the cowl intake and out the ac vents.

SBlexus

Carwash blowers blow direct air so it would be a little different than driving on the highway. The impellers from the blowers are spinning at a minimum of 4500 rpm.

jayclapp

High velocity air on the outside of the car will reduce the static pressure on the outside (static pressure goes down with increasing air velocity). Consequently this lower pressure will cause the air to flow from the car interior to the outside.