Hi there,
This will be the leaking anti freeze drying and forming a crust like substance, I would have the engine washed down and then pressure test the cooling system for leaks, repair any leaks any you should not see this forming again, it is not dangerous to the metal but it is an indication of a coolant leak.
Mark (mhpautos)
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Wednesday, November 12th, 2008 AT 2:14 AM