Originally Posted by
Flinch
Check your intake manifold for cracks around the thermostat housing; those plastic intake manifolds have a track record of cracking.
Did you replace all the coolant that leaked out because of the hose?
URITE.
Especially when overheated, the plastic ones crack. in fact there was a TSB about them as well.
Originally Posted by
Laserjock
You have air in the system. You need to run the engine until it gets the coolant hot with the radiator cap open to let the air out untl the bubbles stop.
This too. 4.6L are well known to have air in the system when refilled with coolant if not done exaclty like the Ford manual requires.
Check the cross over tube for a little plug on it. You can use a ratchet to open it up, fill it from there and let the air bubbles out since it's the highest point in the system.
Be very careful though. The plugs are known to be hard to get out and can strip easily