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That part is the intake manifold. This is where the air is sent to the combustion chambers. Also, the top hose from the rad. goes the thermostate housing on the intake. Ford had a recall on the intake. The coolant goes to that housing and then across the manifold to the other side of the engine. Unfortunately, it is all made of plastic. This plastic in time cracks, leading to a coolant leak which could empty the total amount of coolant in the engine, and if not caught in time, well, there goes the engine. Ford does have a new manifold available with the cross-over made from cast metal. This solves the problem. The part can found anywhere from $ 250.00 to 500.00. It takes 6 to 8 hours to change. There was a large lawsuit in the U.S. over this part also. Google the info for more update. Hope this helps.

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Q: What is the name of the black plastic part on the top of the 1999 mercury grand marquis engine that has water running through it?
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