Heater Core Backflushing

Backflushing - Heater Core





Special Tool(s)





Material

1. WARNING: Never remove the pressure relief cap while the engine is operating or when the cooling system is hot. Failure to follow these instructions can result in damage to the cooling system or engine or personal injury. To avoid having scalding hot coolant or steam blow out of the degas bottle when removing the pressure relief cap, wait until the engine has cooled, then wrap a thick cloth around the pressure relief cap and turn it slowly. Step back while the pressure is released from the cooling system. When you are sure all the pressure has been released, (still with a cloth) turn and remove the pressure relief cap.

Once pressure is released, remove the pressure relief cap.
2. Clamp off the heater hoses.

3. NOTE: 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 Motorcraft Cooling System Flush or equivalent.
4. Remove the clamps from the heater hoses.