Still working on my 300E idle surging problem, but came in the garage last night and the floor was covered with coolant. I immediately knew that I probably lost the radiator (it couldn't be a hose...that would be too cheap)!

Already had the coolant tank replaced, a variety of sensors and hoses switched out, and the water pump replaced about a month ago. So the radiator is the only thing left to change out.

The radiator appears to be an aluminum core with the sides made out of plastic. I couldn't detect a crack, but I could see seepage coming out of the plastic. Is this usually how these radiators go? How much effort will I encounter upon doing the installation myself?

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2009 ML350 (106K) - Family vehicle
2001 CLK430 Cabriolet (80K) - Wife's car
2005 BMW 645CI (138K) - My daily driver
2016 Mustang (32K) - Daughter's car