Cooling System Flushing

Cooling System Flushing





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.

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

2. Remove the thermostat. For additional information, refer to Thermostat - 4.6L (2V) Service and Repair, Thermostat - 4.6L (3V) Service and Repair, Thermostat - 5.4L (3V) Service and Repair or Thermostat - 6.2L (2V) Service and Repair.

3. Install the thermostat housing without the thermostat.

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

Use a cooling system flusher to flush the engine and radiator.

Use premium cooling system flush.

5. Install the thermostat. For additional information, refer to Thermostat - 4.6L (2V) Service and Repair, Thermostat - 4.6L (3V) Service and Repair, Thermostat - 5.4L (3V) Service and Repair or Thermostat - 6.2L (2V) Service and Repair.

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