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.





5. Install the heater hoses.
a. Position the heater inlet hose.
b. Slide the (A) hose clamp toward the end of the (B) heater inlet hose.
c. Position the heater outlet hose.
d. Slide the (C) hose clamp toward end of (D) heater outlet hose.
6. Fill the cooling system.