My 2004 S-Line (190) is leaking coolant! I've been filling up the res. about every 100 miles. I think I've traced the leak. It seems to be coming from a plug or valve on top of the hose that runs on top of the engine, to the right underneath the engine cover.
Does anyone know what this part is / name of this hose? Hopefully I can then get one on Ebay or something.