Here's the solution: When you replace the mode actuator, be sure to connect both posts on the actuator to the connector arms that control the dampers for the vents. On my 2008, there is arm on the dash side and a second arm further back, toward the engine. This second arm is the connection I missed and it is the arm that opens and closes the damper to the windshield vents. You can reach in and move the arm with your hand and see how it closes and opens the damper. So, just make sure the rear post (the post closest to the engine) on the actuator attaches to that connector and your system should work perfectly!