I didn't have a problem with the plastic radiator on my old 300E until I had the cooling system flushed, then the top radiator neck broke off. I think it broke because the top radiator hose was over tightened. My new clk430 is now due for a cooling system flush. If I take it in to the dealer to have the work done, does the Mercedes recommended procedure involve removing any of the radiator hoses so they can be over tightened and the radiator neck broken off again? Or, is there a Mercedes recommended way the system can be flushed without removing the hoses?

I also believe that the necks have since been reinforced with a metal (brass??) sleeve to prevent breakage.

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Mike Tangas
'73 280SEL 4.5 (9/72)- RIP
Only 8,173 units built from 5/71 thru 11/72

'02 CLK320 Cabriolet - wifey's mid-life crisis

2012 VW Jetta Sportwagon TDI...at least its a diesel

Non illegitemae carborundum.

I used only MB antifreeze in my 300E. A radiator should last longer than 75,000 miles (8 years). I would rather not take a chance on a possible radiator redesign.