OK, not that I don't have heat, just none when the car is at idle. Once there is backpressure while moving, plenty of hot air. Now, I'm trying to figure out what is causing this. The blower motor and thermostat are fine. Could it be a tube with a hole in it or a valve that is stuck and not opening unless it gets a lot of backpressure? Problem being I like to warm the engine in the mornings as well as the cabin and defrost the windows, but I get no help because it only blows cold air. The only thing it does help with is getting the motor warm. Any ideas?