i have a 2003 mini. if you let it idle it will warm up and blows hot air, but when you start driving the guage drops and the hot air is gone. i have changed the coolant temp sensor and the thermostat. any other ideas?

 

Don't let it idle.

 

well im trying to get the heat.. its winter.. winter is cold.. having heat in the car would be nice.. the only thing is i got an autozone thermostat, so maybe it dosnt have the same opening temp? im going to try getting one from bmw.