I am having a problem with the heating. The car has heat when the car is in motion, but when i am at a stop sign, or light or park cool air comes out even after the car has been warmed up. The car runs fine.... besides 1 oxygen sensor needs to be changed. The heat works all other times only when the car is not in motion any ideas? thanks

Bleed the cooling system, add more antifreeze if necessary. If this cures your problem, great, if not...

look at your temperature gauge. If it cools down when you're on the highway, and returns to normal temperature when standing still idling... your thermostat is dead, a new one from Bavauto is about $70.

If these 2 methods don't work for you, you may need a new water pump.