I assume it is an automatic climate control system. It is all electronic controlled. It could be a stuck or bad motor for operating the direction of flow. Not something you can check unless you are familiar with this system. A shop with a scan tool can look at the hvac module for any codes and manipulate the mode doors for operation. It may require removal of the dash to check the mode door itself.
I suggest a shop for help
Sunday, October 9th, 2011 AT 1:17 AM