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This has been discussed before (also happens on other MB's)...but I don't think there is any real peace of mind choice but to get another radiator. After it is broken I don't think there is any glue of any kind that will really hold for any length of time. This is not an area to fool around with because a sudden loss of coolant when the engine is hot (on the highway) can warp the heads on any aluminum engine, not just MB's...
Be aware that it is thought that bad motor mounts contribute to this breakage, the top hose pulls on the radiator neck when there is excessive engine movement.
That being said, an aftermarket radiator is not really all that expensive and (having just pulled my radiator to clean it) it's very easy to remove and to replace, taking nothing more than a screwdriver to do. Messy, but rather easy. And a good opportunity to replace the hoses.
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