Coolant System Flushing

Coolant System Flushing (Without HP5)

Note: This procedure is intended for the engine cooling system only. Never use this procedure to flush the hybrid cooling system.

Note: Do not use a chemical flush.

Store used coolant in the proper manner, such as in a used engine coolant holding tank. Do not pour used coolant down a drain. Ethylene glycol antifreeze is a very toxic chemical. Do not dispose of coolant into the sewer system or ground water. This is illegal and ecologically unsound.

Various methods and equipment can be used to flush the cooling system. If special equipment is used, such as a back flusher, follow the manufacturer's instruction. Always remove the thermostat before flushing the cooling system.

When the cooling system becomes contaminated, the cooling system should be flushed thoroughly to remove the contaminants before the engine is seriously damaged.

1. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill With HP5) (Service and Repair)Cooling System Draining and Filling (Static Fill Without HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill With HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill Without HP5) (Service and Repair).
2. Remove the surge tank. Refer to Radiator Surge Tank Replacement (Service and Repair).
3. Clean and flush the surge tank with clean, drinkable water.
4. Install the surge tank. Refer to Radiator Surge Tank Replacement (Service and Repair).
5. Follow the drain and fill procedure using only clean, drinkable water. Refer to Cooling System Draining and Filling (Static Fill With HP5) (Service and Repair)Cooling System Draining and Filling (Static Fill Without HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill With HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill Without HP5) (Service and Repair).
6. Run the engine for 20 minutes.
7. Stop the engine.
8. Drain the cooling system. Refer to Cooling System Draining and Filling (Static Fill With HP5) (Service and Repair)Cooling System Draining and Filling (Static Fill Without HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill With HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill Without HP5) (Service and Repair)
9. Repeat the procedure if necessary, until the fluid is nearly colorless.
10. Fill the cooling system. Refer to Cooling System Draining and Filling (Static Fill With HP5) (Service and Repair)Cooling System Draining and Filling (Static Fill Without HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill With HP5) (Service and Repair)Cooling System Draining and Filling (GE 47716 Fill Without HP5) (Service and Repair).