2001 BMW 325ci heat/cool roller switch on dash only puts out hot air

What is your question?

the heat/cool roller switch on dash puts out hot air no matter what position the roller is in. Some cool air comes out of the side vents, but warm air in center vents when roller is in cold position. I had a similar problem with my 2002 X5, but it eventually worked itself out and have not had that problem for 5 years. Is there a fix for this other than taking apart the whole dash to get to that valve unit? I have been told that is a minimum 7 hour job just to get to it.

How long has your 2001 BMW 325Ci had this problem?

a few weeks