Chevrolet Sonic manuals

Chevrolet Sonic Repair Manual: Coolant System Flushing

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 manufactures instruction. However, always remove the thermostat before back flushing the system.
  1. Apply the parking brake.
  2. Drain the coolant. Refer to Cooling System Draining and Filling.
  3. Fill the cooling system with clean drinkable water. Refer to Cooling System Draining and Filling.
  4. Start the engine and run at 2,000 RPM until the thermostat opens.
  5. Turn OFF the engine.
  6. Drain the coolant system. Refer to Cooling System Draining and Filling.
  7. Repeat the above procedure until the water from the coolant system is colorless.
  8. Drain the coolant system. Refer to Cooling System Draining and Filling.
  9. Repeat the above procedure until the water from the coolant system is colorless. Refer to Cooling System Draining and Filling.
Information
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Cooling System Description and Operation
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