I'd agree the belt is the number one suspect. They can be difficult to change but not impossible for the average DIY'er. I have no idea where the water came from...

__________________
-Evan


Benz Fleet:
1968 UNIMOG 404.114
1998 E300
2008 E63


Non-Benz Fleet:
1992 Aerostar
1993 MR2
2000 F250