Heater Core Backflushing

Heater Core Backflushing





1. WARNING: Always allow the engine to cool before opening the cooling system. Do not unscrew the coolant pressure relief cap when the engine is operating or the cooling system is hot. The cooling system is under pressure; steam and hot liquid can come out forcefully when the cap is loosened slightly. Failure to follow these instructions may result in serious personal injury.

Once pressure is released, remove the pressure relief cap.


2. Partially drain the cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding Cooling System Draining, Filling and Bleeding.

3. NOTE: Refer to the cooling system flusher operating instructions for particular vehicle hook-up.

Use an appropriate cooling system flusher to backflush the heater core. Use Premium Cooling System Flush VC-1 or equivalent meeting Ford specification ESR-M14P7-A.


4. Fill the cooling system. For additional information, refer to Cooling System Draining, Filling and Bleeding Cooling System Draining, Filling and Bleeding.