Those vents behind the back window...

[Mike94ZLT1]

What are they for? I went outside to start my car today, and as I walked by I heard air coming out of them. I got closer and could feel the air coming out. What's up with that? I've never seen it before.

I just got this car a month ago from my father in law, I'm currently using it as my winter ride to keep salt off my other vehicles and I'm discovering I really like it!

[Hawairish]

Cabin vents so that when you push air into the cabin (i.e., non-circulating air from the fan/AC), slam a door closed, or if the car interior gets excessively hot, the air pressure can exhaust through them.

Pretty standard automotive tech. Usually there's an interior vent that has some flaps on it that otherwise keep the vent closed. Perhaps most noticeable on pickup trucks...if you look somewhere between the back of the cab and the truck bed, you'll probably see a plastic vent with flaps...close the door quickly and you'll see the flaps lift briefly. For other cars and SUVs it's less noticeable since the vents are generally hidden in trunk gaps or pillars.