BMW Repair: Heater Problems, air bubbles, turning the key

Question
Hi and thank you in advance for your assistance.
I am the proud owner of a 1998 E46 328 4 door automatic BMW. I have only one problem and that is; when I turn the heater on (even as high as 32 degrees) it blows out cool air when the car is idle. When the car rev's are up and over 2000 the air blows out hotter and the higher the rev's the hotter it gets. If I use the auto function on the heater - the higher the revs the fan blows faster and hotter air and again when idle the fan slows down and it gets colder.
I hope there is a quick fix.
Thank you / Taner

Answer
Check the level of coolant in your radiator.It sounds as if you have air in the system.You can bleed the system by turning the key to the on position and the temp on high.Open the bleeder screw near the radiator when air bubbles stop coming out of screw tighten screw and top level off.