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Originally Posted by Don Moranville
As I attempted to explain in my description of crack: it is about 1/4" to 3/8" (8 to 12mm) long, on top of neck between hose and radiator, longitudinal in direction, and leaks very little when hot.
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You are correct to patch it.
If it leaks, you are not maintaining pressure, thus you are running hotter than necessary. And that small crack, because of its location, will eventually become a big crack.
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2008 E350 4matic / Black/Anthracite
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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black
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