Flushing - Heater Core

Special Tools:

1. WARNING: Never remove the pressure relief cap/radiator cap under any conditions while the engine is operating. Failure to follow these instructions could result in damage to the cooling system or engine and/or personal injury. To avoid having scalding hot coolant or steam blow out of the cooling system, use extreme care when removing the pressure relief cap from a hot degas bottle or the radiator cap from the radiator. Wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly one turn (counterclockwise) or with a thick cloth around the radiator cap turn the radiator cap (counterclockwise) slowly to the first pressure stop. Step back while the pressure is released from the cooling system. When certain all the pressure has been released, remove the pressure relief cap/radiator cap (still with a cloth).

Once pressure is released, remove the pressure relief cap.
2. Partially drain the cooling system.

3. NOTE: For additional information, refer to the cooling system Flush-All Operating Instructions for particular vehicle hook-up.

Use cooling system Flush-All, Flush Kit Hardware Package and Drain Kit to backflush the heater core. Use Premium Cooling System Flush F1AZ-19A503-A meeting Ford specification ESR-M14P7A for vehicles filled with Premium Engine Coolant E2FZ-19549-AA or equivalent meeting Ford specification ESE-M97B44-A (green color).
4. Fill the cooling system.