Some 2011-14 Ford Mustangs with 3.7-liter engines may leak antifreeze and eventually overheat after engine startup.
The carmaker attributes the condition to air infiltrating the cooling system. Installing a revised water pump, seal and thermostat housing-to-coolant reservoir hose should eliminate further trouble.
The new part numbers for the swap are BR3Z-8501-G, 7T4Z-8590-A and ER3Z-8276-A, respectively.
Before ordering the upgraded parts, however, look for a check valve in the existing thermostat housing-to-coolant reservoir hose in the location shown in the illustration. If the hose doesn't have a check valve, go ahead and order the new parts. If the hose has a check valve, the new parts have already been installed and you'll have to look elsewhere to determine the cause of the coolant leakage issue.
