Did you also check if the belt was loose? The belt can be in place and loose because it is about to fail or because of a tensioner. Coolant residue can also cause it to slip. A loose belt would not be turning the associated pulleys adequately which could result in your symptoms. Have you cleaned the belt since the coolant spills? Coolant leaks don't go away. Are you checking the coolant level frequently or waiting until the warning light comes on?

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X5 4.6 2002 Black Sap, Black interior. 2013 X5M Melbourne Red, Bamboo interior
Dallas