E46 Heater problem
Hi, I have a 2000 E46 328 with auto A/C and unusual problem. During cold weather where the temperature set on the control panel causes the vents to blow warm/hot air, it blows very hot as soon as heat is available after start-up. this continues relentlessly for about 20 minutes and the air inside the car becomes too hot for comfort - even with the controls set to 20C. After 20 minutes all heat ceases and the fan blows totaly cold air from then on. The wheel control on the dash is set to one or two red dots (after the 20 minute cut-off these have no effect). The fan functions perfectly and responds to all control settings. It seems that heat is present in the heater matrix because after the 20 minute cut-off the defrost button will still blow hot air to the screen vents! Can anyone help?