batterie dies@radiator over heats.

Looks like a charging system problem. Get the alternator checked. Try to avoid the overheating, it could seriously damage your engine. Zee

We service a lot of Mercedes and it sounds like you have three seperate concerns. The battery going dead could be a faulty alternator, bad battery or an electricall draw on the system. You can call us at 253-833-8161 if you would like help diagnosing the concern(S). Thanks, Greg