Leaking near block by the hose and fitting can not tell if it is fitting or hose.
SOURCE: Where is the heater core hose in my 2000 ford expedition?
check closer to just underneath the firewall--it could be a smaller problem than a heater core--Ford 4.6--5.4 engines have a tube just underneath the intake manifold that the rubber hose goes bad and it will leak towards the back of the engine.Lets hope so-what i hear its very expensive to change a heater core in an Expedition.
SOURCE: Heater core burned out and I want to bypass the coolant hoses.
Without knowing your car specifically I can suggest the generic way to do it. Locate the two heater hoses going into the firewall, probably on the passenger side. They're the ones that get hot and are about an inch + in diameter. Disconnect. Measure the inside diameter of the hose and purchase a short piece of galvanized or copper pipe (6 inches) at Home Depot. Connect both ends of the hoses to the pipe to form a loop. Secure the hoses so they don't land some place that would cause a problem.
I had this problem on an 85 Tbird. I had heard about a product called Bars Leak and tried it. It worked. No leaks and I kept my heater. You should be able to find it at any parts place at less than $10. Ground black pepper also has worked for me.
SOURCE: Heater Core coolant flow 97 F250 Powerstroke
The one that comes out directly from the engine block
SOURCE: leaking coolant from the rear of the engine
try using a mirror to see in the rear of the motor because ther are freez or welch plugs at th rear of the head & engine block!
it may also be leaking behind the flywheel & can only be seen coming from where the transmission or gearbox bolts to th motor!
Cheers Rob
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