heating problems

[jshelby]

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?

[flamingvictory]

Don't let it idle.

[jshelby]

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.