I have a 2006 330i. My A/C only blows cold or hot but noting in between. It only blows really cold or really hot. I've tried dialing in all the different temperature settings in between. I've adjusted the temp wheel on the top as well. Any ideas what is causing the climate control to only work at the opposite ends of the temp spectrum. It's getting old having to constantly turn the heat on and off when it gets too hot or cold.