GM Service Manual Online
For 1990-2009 cars only

Special Tools

    • KM-471 Adapter
    • KM-6327 Cooling System Test Adapter

    Warning: Under pressure, the temperature of the solution in the radiator can be considerably higher, without boiling. Removing the radiator cap while the engine is hot (pressure is high), will cause the solution to boil instantaneously, with explosive force. The solution will spew out over the engine, fenders, and the person removing the cap. Serious bodily injury may result. Flammable antifreeze, such as alcohol, is not recommended for use at any time. Flammable antifreeze could cause a serious fire.

    Warning: In order to help avoid being burned, do not remove the radiator cap while the engine and the radiator are hot. Scalding fluid and steam can be blown out under pressure if the cap is removed too soon.

  1. Open the hood.
  2. Detach the coolant expansion tank closure cap.

  3. Object Number: 1943965  Size: SH
  4. Check the coolant level.
  5. Top up the coolant to the COLD mark if necessary.

  6. Pull the coolant expansion tank from the bracket in the direction of the battery.
  7. Note: Follow manufacturer instructions.

  8. Attach the coolant system tester (1) with KM-471 (2) and KM-6327 (3) to the coolant expansion tank.
  9. Apply approximately 100 kPa (15 psi) to the cooling system.
  10. Cooling system, check for leaks
  11. Detach the cooling system tester.
  12. • Release the pressure.
    • Detach the cooling system tester with KM-471 .
  13. Attach the coolant expansion tank closure cap.
  14. Slide the coolant expansion tank onto the bracket.
  15. Close the hood.