heat

When I change to defrost there is brief pause like the air flow is changing direction but then the air just continues to come out of the top vents and not the front window defrost vents. When I look behind the glove box (to the left of the cabin air filter compartment) I can see the gear moving...

I have a 2008 Corolla it starts up fine in the morning, I go to work and at lunch time I go to start it and it takes a long time. I was told the throttle body was dirty, so it was cleaned, no difference. It also when I come to a stop the idle drops a bit and feels like it wants to die for a few...