Join Date: Jan 2010
Location: Simi Valley, CA
Vehicle: 2006 SLK55
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More than likely, it's the water pump. Here's why:
If it were a hose, the "drip" would become a pressure stream after a day or two.
If it were a head gasket or cracked head, the water would be going INTO the motor and mix with the oil to make a milky looking oil. The car would also over heat pretty quickly.
It could be the cap, but once again, you should see steam coming out of it when hot.
Water pumps do not last forever. The seals and bearing eventually wear out.
Until you can replace the pump, put in some "Bars leak". The stuff will close up small holes for a while. There's also "Alumiseal" which does same thing but works better on radiators.