My 2004 S-Line (190) is leaking coolant, so 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 situated on top of the hose that runs on top of the engine, to the right just 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.