Forum Friends........ Need some advise and HELP !! My 1994 E420 has issue with entire climate control/AC panel . NONE of the buttons work for fan , vents, etc. Nothing. When i push ANY button - I get Nothing. I have replaced the entire push button climate control AC part with a KNOWN working unit AND replaced the 30amp strip fuse under hood....Any other advise, suggestions, or experience on what to check Next???? THANKS; in advance to ALL input