Had my 2001 W215 for 6 months an just started to notice small pools raidiator fluid on the floor of my garage. I remember seeing one time that I had to add fluid to the sub tank. I peeked in the back of the engine an noticed that it was coming from the back section. I haven't driven the car far just around town.
Can I please get assistance with my problem, thanks
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It's typically a small coolant hose that goes through the firewall

 

Thank you very much. Question is it a easy fix an are there better grade hoses besides OEM?