Note: This is a general guide and may not apply to your vehicle.
How to Replace Heater Core Hoses
for the 2005 Ford F-150 XLT 8 Cyl 5.4L change
Always wear safety glasses when working on your vehicle. Wear other personal protective equipment (PPE) when necessary, for example latex gloves or closed toe shoes.
Open the hood and locate the heater core hoses.
Inspect the heater core hoses for signs of leaking.
If you cannot find where the coolant is leaking from, pressure test the system - with the engine and cooling system cold - and re-inspect for leaking. When pressure testing, be sure not to exceed the radiator cap / system pressure rating.
Release pressure from cooling system after finding leak.
Drain the cooling system.
Loosen hose clamps and carefully remove the leaking hose.
Install the new hose, install new hose clamps, and refill cooling system with recommended anti-freeze / water mixture at 50/50 concentration.
Pressure test cooling system again to check for any other leaks. Repair any new leaks.
Start engine and let it reach operating temperature. Let engine cool down and re-check coolant level.
Install radiator cap, close the engine compartment hood, test drive.
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