Big puff of air from behind tires?

Hey guys. I have a 2003 ford mustang v6. I recently noticed that when I pull into my driveway or anywhere else to park, as soon as i shut off my car and close the door a noticable gush of air shoots off behind my front tires. What the hell could this possibly be? My mustang is in perfect condition. Please help!!

Evil C2016-07-25T19:03:54Z

Only thing I can think of is the cooling fan is still on for a moment pulling air through the radiator but there's probably a baffle or part of the fan shroud missing allowing some of the air to be directed toward the ground. Other than that I don't know.

thebax20062016-07-26T05:29:51Z

Is the radiator fan coming on?