News Technical Service Bulletins

Leak Issue for Ford Mustang

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See the arrow for the location of the potential leak.



Some 2015 Ford Mustang vehicles equipped with a 5.0L dual overhead camshaft (DOHC) engine may exhibit a coolant leak caused by a heater outlet hose becoming disconnected at the heater outlet tube on the coolant pump.

If this leak is found, drain the cooling system, remove the air cleaner outlet pipe and remove the bolts that secure the degas bottle and set the degas bottle aside. Completely cover the accessory drive belts with waterproof plastic. Disconnect the heater outlet hose from the heater outlet tube.

Release the clamp and disconnect the lower degas bottle hose from the heater outlet tube. Release the upper radiator hose clamp from the heater outlet water connection. Pull the upper radiator hose T-connector spring clip up until the end of the clip is in the detent on the quick connect coupling and remove the upper radiator hose T-connector from the thermostat housing.

Remove the bolt and the heater outlet tube. Install the new heater outlet tube and the bolt. Tighten the bolt to 89 in-lb. Lubricate the O-ring seal on the heater outlet tube with a clean engine coolant. Continue reinstallation. 

The new heater outlet tube is available as P/N BR3Z-18663-A.

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