thank you rick , as I play with the buttons, i"ve noticed that the ac compressor kicks on no matter which button I push. Also, should the aux water pump always be running? As I have said, it is not running, am wondering if it is burned out? I have sent
away for 3 mercedes manuals at books 4 cars.com as it is the only place I could find them. I hope they will help me to understand the acc system. any other help would be great steve