If the steel pipe is coming off the manifold, chances are that is a heat riser used to warm the fuel going into the engine when it is cold outside. As far as the coolant leak, if it is dripping on to the exhaust manifold, check for an intake leak or head gasket leak. Let me know if can tell where it is coming from. If you still can't, there make a dye you can put into the coolant and check for leaks with a black light. It coolant will glow and it makes it easier to follow its trail.
Let me know.
Joe
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Thursday, July 8th, 2010 AT 4:51 PM