I just bought an 05 C230 Kompressor and I'm new to Mercedes. Call me crazy, but I've read every manual I have and cannot figure out how to set the time or change outside temp to F. It doesn't even show up as an option when I scroll through the menu on the dash. It's driving me crazy. I have an aftermarket Navigation system. Did that over ride the feature or something?

 

You would receive better help in the w203 section (which is the model for your c-class). This is the w204 section for 2008-current year models. And the two cars are drastically different.

If it helps you at all, in the w204 we change our time through the entertainment cluster using the steering wheel controls in the speedometer area.