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HOMESERVICE MANUALSCHEVROLET2008OPTRA5 LT, STANDARDREPAIR AND DIAGNOSISENGINE MECHANICALCOOLING SYSTEM (MECHANICAL)ENGINE COOLINGREPAIR INSTRUCTIONSCOOLING SYSTEM DRAINING AND FILLING (GASOLINE ENGINES )
2008 Chevrolet Optra5 LT, Standard

Cooling System Draining and Filling (Gasoline Engines )

2008 Chevrolet Optra5 LT, StandardSECTION Cooling System Draining and Filling (Gasoline Engines )
    CAUTION: Refer to Radiator Cap Removal Caution .
  1. Place a pan below the vehicle to catch the draining coolant.
  2. Remove the surge tank cap.
    3. Fig 1: View Of Drain Cock
    GM1291067Courtesy of GENERAL MOTORS CORP.
  3. Unplug the drain cock.
    4. CAUTION: Dispose of the used engine coolant properly. Store the used coolant in a used coolant Holding Tank awaiting proper disposal or recycling. Do not pour used coolant down the drain. Ethylene glycol antifreeze is a very toxic chemical. Disposal into the sewer system or into the ground water is both environmentally irresponsible and illegal
  4. Catch the escaping fluid in a drain pan.
  5. Remove all sludge and dirt from inside the surge tank. Refer to Radiator Surge Tank Replacement .
  6. Plug the drain cock.
  7. Add the clean water to the surge tank.
  8. Fill the tank slowly so that the upper reservoir hose remains above the water line. This allows the air inside the cooling system to escape.
  9. Start the engine.
  10. Run the engine until the thermostat opens. You can tell the thermostat is open when both radiator hoses are hot to the touch.
  11. Stop the engine.
  12. Repeat steps 1-9 until the drained water is clear and free of coolant and rust.
    13. IMPORTANT: Never use an antifreeze mixture more concentrated than 60 percent antifreeze to 40 percent water. The solution freezing point increases above this concentration.
  13. Fill the cooling system through the surge tank with a mixture of ethylene glycol antifreeze and water. The mixture must be at least 50 percent antifreeze, but not more than 60 percent antifreeze.
    14. Fig 2: View Of Surge Tank MAX Fill Mark
    GM1291079Courtesy of GENERAL MOTORS CORP.
  14. Fill the surge tank to the specified MAX fill mark on the outside of the tank.
RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.