Heater Core Backflushing

Materials 

Flushing 

All vehicles 

• 1.
  
  

  Courtesy of FORD MOTOR COMPANY

  Courtesy of FORD MOTOR COMPANY

  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.

  Remove the pressure relief cap.

Courtesy of FORD MOTOR COMPANY

• 2.
  
  Clamp and disconnect the heater hoses at the front heater core.

Courtesy of FORD MOTOR COMPANY

Vehicles with rear climate control 

• 4.
  
  Clamp and disconnect the heater hoses.

• 5.
  
  Clamp and disconnect the heater hoses at the rear heater core.

Courtesy of FORD MOTOR COMPANY

All vehicles 

• 6.
  
  
  NOTE: Refer to the cooling system flusher manufacturer's operating instructions for specific vehicle hook-up.

  Use a cooling system flusher to backflush the heater core(s). Use Premium Cooling System Flush or equivalent.

  Material: Motorcraft® Premium Cooling System Flush / VC-1 (ESR-M14P7-A)

• 7.
  
  Remove the clamps from the heater hoses.

• 8.
  
  Fill and bleed the cooling system. Refer to filling and bleeding without a vacuum cooling system filler. Refer to: Cooling System Draining, Vacuum Filling and Bleeding .