[jorgens]

Hello there!

I had the exact same problem on mine.
The dealer told me that "of course it's rusting; as you don't have mud-flaps"

Nice answer I thought, I mean how the hell can Ford deliver it without the bleeding flaps if it obviously needs it ?!?

After an arguement with the dealer they agreed to fix it free of charge...

 

[jorgens]

You can by std. mudflaps for the -04 C-max at your local Ford-dealer.
Easy fit, and not to expensive.