Most Halal Mod
Join Date: Feb 2008
Location: 7900' in Colorado
Even though the door is closed, it won't completely shut off the outside air. If it's allowing a ton of air into the cabin, then maybe the motor is sticking, but a little bit of air is normal.
Especially helpful when your wife farts inside the truck and doesn't tell you. You don't want to smell that forever! It's worse than my dog. In theory (women don't fart, from what I've been told).