Expedition 4WD V8-4.6L SOHC VIN 6 (1997)
Heater Core: Service and Repair
Back Flushing-Heater Core
1. Release the pressure in the cooling system by slowly turning the radiator cap one turn counterclockwise. When the pressure is released, remove the
radiator cap.
WARNING: DO NOT OPEN THE COOLING SYSTEM WHILE IT IS HOT OR WHILE THE ENGINE IS RUNNING.
2. Partially drain the cooling system.
3. Remove the two heater hoses from the engine.
a. Slide the (A) hose clamp away from the end of the (B) heater inlet hose.
b. Remove the heater inlet hose.
c. Slide the (A) hose clamp away from the end of the (By heater outlet hose.
d. Remove the heater outlet hose.
4. Use cooling system Flush-All, Flush Kit Hardware Package and Drain Kit to back flush heater core with Ford Premium Cooling System Flush
F1AZ-19A503-A or equivalent meeting Ford specification ESR-M14P7-A.
