Hi there- just purchased a 2005 QX56. Few questions...

1. My heater blows hot air as it should (both on auto and manual settings). However, it cuts in an out (i.e. it stops blowing for a few seconds to minute and then continues. Even if I turn it to manual and crank it up nothing. It returns a momentarily. I was told by the dealer it could be a air pocket in the coolant. Any other suggestions?

2. There's a clicking noise when changing from defog to foot to face on the air direction. It sounds like a "door" getting stuck. It also happens when the car is off (about a minute after the key's out of the ignition.

Help?!