In reply to Barry.

My van does the same. The front passenger get more air than the driver, and hotter or colder*, depending. Not worth fixing unless it gets much worse.

• Y'all down there might not need to know this, but your car can blow hot air into the passenger compartment when it's cold outside. Come to think of it, you probably do need to know, because sometimes you get deep freezes where the temperature gets below 60F.