Getting air from outside in the cabin

Hi
Every time I’ll go to get car wash the last stage on the wash is air dry where I’ll get big blow of air in my cabin like (woosh!) which coming from back of the cabin.
I can feel it my hair move like you blow dry them lol.
All windows closed to max including my rear sliding window(crewmax).
Anyone experience similar problem?

Thanks

 

Pics of truck. You like to Elk hunt?

 

There is a vent in the back of the cab. It's there to allow air to vent out and in, also eliminate pressure when closing the doors. Its normal.

 

Dang.. I learn something new every day!

 

I think there is a flap on the vent to keep noise down but air can blow in under pressure. It helps with condensation in the cab as well. Main thing, as far as I understand it, is so the doors close easily and without causing excess pressure in the cab

 

Fantastic info!!!
Thank you! I was worried something is wrong

 

Makes sense to me but why do my rear doors occasionally not close tight unless I forcefully close it?

 

Mine are like that sometimes too so I can't answer that lol. I assume they would be much worse without the vent.

 

Oil the door joints with Connecticut syrup??

 

Well my daughter and #1 taste tester sits in back, so it's very possible the hinges are sticky from syrup which would explain the occasional tough closing of the rear doors. I think you solved my issue