Flushing the Cooling System

Flushing

Important:
^ 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. DEX-COOL antifreeze is a 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. However, always remove the thermostat before back flushing the system.

1. Block the drive wheels.
2. Place the transmission in park (P) or neutral (N).
3. Engage the park brake.
4. Remove the thermostat.
5. Fill the cooling system with water only.
6. Run the vehicle until normal operating temperature is reached.
7. Drain the cooling system.
8. Repeat until the drained water is nearly colorless.
9. Remove, clean and install the coolant recovery reservoir.
10. Install the thermostat.