Flushing-Heater Core

Heater Core Backflushing

1. WARNING: Do not open the cooling system while it is hot or while the engine is running. Failure to follow these instructions may result in personal injury.

Partially drain the cooling system.

2. NOTE: For additional information, refer to the cooling system flusher manufacturer's operating instructions for particular vehicle hook-up.

Use an appropriate cooling system flusher to backflush the heater core. Use Motorcraft Cooling System Flush VC-1 or equivalent meeting Ford specification ESR-M14P7-A. Flush with water thoroughly after using VC-1 or equivalent prior to refilling the cooling system.
3. Fill the cooling system.