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Home >> Buick >> 2007 >> Lucerne CX >> Repair and Diagnosis >> External Pages >> Different car >> Section 48 (Engine Cooling System) >> Repair Instructions >> Draining and Filling Cooling System (LY7) >> Filling Procedure

Filling Procedure

WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.
    NOTE: The procedure below must be followed. Improper coolant level could result in a low or high coolant level condition, causing engine damage.
    NOTE: Refer to Fastener Notice in Cautions and Notices.
  1. Close the radiator drain cock.
  2. If the engine block was drained for the LY7 engine, install the coolant drain plugs. Refer to Engine Block Disassemble in Engine Mechanical - 3.6L.
    3. IMPORTANT: Use a 50/50 mixture of DEX-COOL antifreeze and clean, drinkable water.
  3. Slowly fill the cooling system with a 50/50 coolant mixture until the coolant level is visible and stable.
  4. Install the pressure cap loosely (threaded on about one turn).
  5. Start the engine and raise the engine speed to 2500 RPM and hold it there for 40 seconds, then shut engine OFF.
  6. Remove the pressure cap and fill the coolant system until the level is visible and stable.
  7. Install the pressure cap loosely (threaded on about one turn).
  8. Start the engine and raise the engine speed to 2500 RPM and hold it there for 30 seconds, then shut engine OFF.
  9. Remove the pressure cap and fill the coolant system until the level is visible and stable.
  10. Install the pressure cap loosely (threaded on about one turn).
  11. Start the engine and raise the engine speed to 2500 RPM and hold it there for 20 seconds, then shut engine OFF.
  12. Remove the pressure cap and fill the coolant system until the level is visible and stable.
  13. Install the pressure cap, fully threaded on.
  14. Fill the coolant recovery bottle to the indicator line, then add 300 milliliters (10 ounces) more.
  15. Start the engine and run it above 2500 RPM until it is hot enough to open the thermostat, this will allow the trapped air to be purged from the engine.
  16. Turn the engine off and allow it to cool down.
  17. Fill the coolant recovery bottle to the indicator line.
  18. Inspect the concentration of the engine coolant using the J 26568  .
  19. Rinse away any excess coolant from the engine and the engine compartment.
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