I have a 2000 E320 W210 and I am having a problem with my A/C. The economy light on my climate control unit will not go off not allowing my compressor to kick in. I can press any button on the unit but the EC light stays on. It is a problem with the climate control push button unit itself? From the price of those things I hope not. I am hoping it is some other electrical part that is the problem. Any help is greatly appreciated.