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Home >> Isuzu >> 2007 >> i-290 LS, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 66 (Engine Cooling System) >> Repair Instructions >> Draining and Filling Cooling System (Vac-N-Fill) >> Vac-N-Fill Procedure

Vac-N-Fill Procedure

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.
IMPORTANT: To prevent the boiling of the coolant/water mixture in the vehicle's cooling system, do not apply vacuum to a cooling system above 49°C (120°F). The tool will not operate properly when the coolant is boiling
  1. Install the J 42401  onto the coolant surge tank. See Special Tools .
    2. Fig 1: Identifying Vac-N-Fill Cap
    GM1617435Courtesy of GENERAL MOTORS CORP.
  2. Attach the Vac N Fill cap to the vehicle's coolant fill port.
    3. Fig 2: Attaching The Vacuum Gage Assembly To The Vac-N-Fill Cap
    GM1617436Courtesy of GENERAL MOTORS CORP.
  3. Attach the vacuum gage assembly to the Vac N Fill cap.
    4. Fig 3: Attaching The Fill Hose To The Barb Fitting On The Vacuum Gage Assembly
    GM1617437Courtesy of GENERAL MOTORS CORP.
  4. Attach the fill hose to the barb fitting on the vacuum gage assembly.

    Ensure that the valve is closed.

    5. Fig 4: Identifying Graduated Reservoir
    GM1617438Courtesy of GENERAL MOTORS CORP.
    IMPORTANT: Use a 50/50 mixture of DEX-COOL antifreeze and clean, drinkable water.
    Always use more coolant than necessary. This will eliminate air from being drawn into the cooling system.
  5. Pour the coolant mixture into the graduated reservoir.
  6. Place the fill hose in the graduated reservoir.
    7. IMPORTANT: Prior to installing the vacuum tank onto the graduated reservoir, ensure that the drain valve located on the bottom of the tank is closed.
  7. Install the vacuum tank on the graduated reservoir with the fill hose routed through the cut-out area in the vacuum tank.
    8. Fig 5: Attaching The Venturi Assembly To The Vacuum Tank
    GM1617439Courtesy of GENERAL MOTORS CORP.
  8. Attach the venturi assembly to the vacuum tank.
    9. Fig 6: Attaching A Shop Air Hose To Venturi Assembly
    GM1617440Courtesy of GENERAL MOTORS CORP.
  9. Attach a shop air hose to the venturi assembly.

    Ensure the valve on the venturi assembly is closed.

    10. Fig 7: Attaching The Vacuum Hose To The Vacuum Gage Assembly And The Vacuum Tank
    GM1617441Courtesy of GENERAL MOTORS CORP.
  10. Attach the vacuum hose to the vacuum gage assembly and the vacuum tank.
  11. Clamp the overflow hose closed.
    12. Fig 8: Opening The Valve On The Venturi Assembly
    GM1617442Courtesy of GENERAL MOTORS CORP.
  12. Open the valve on the venturi assembly. The vacuum gage will begin to rise and a hissing noise will be present.
    13. Fig 9: Continuing To Draw Vacuum Until The Needle Stops Rising
    GM1617443Courtesy of GENERAL MOTORS CORP.
  13. Continue to draw vacuum until the needle stops rising. This should be 610-660 mm Hg (24-26 in Hg).

    Cooling hoses may start to collapse. This is normal due to vacuum draw.

  14. To aid in the fill process, position the graduated reservoir above the coolant fill port.
    15. Fig 10: Slowly Opening The Valve On The Vacuum Gage Assembly
    GM1617446Courtesy of GENERAL MOTORS CORP.
  15. Slowly open the valve on the vacuum gage assembly. When the coolant reaches the top of the fill hose, close the valve. This will eliminate air from the fill hose.
  16. Close the valve on the venturi assembly.
  17. If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum. Monitor for vacuum loss.

    If vacuum loss is observed, refer to Loss of Coolant .

  18. Open the valve on the vacuum gage assembly. The vacuum gage will drop as coolant is drawn into the system.
    19. Fig 11: Closing Valve On Vacuum Gage Assembly
    GM1617448Courtesy of GENERAL MOTORS CORP.
  19. Once the vacuum gage reaches zero, close the valve on the vacuum gage assembly and repeat steps 12-18.
  20. Detach the Vac N Fill cap from the vehicle's coolant fill port.
  21. Remove the J 42401  from the coolant surge tank. See Special Tools .
  22. Add coolant to the system as necessary.
  23. Use the J 26568  to inspect the concentration of the coolant mixture using. See Special Tools .
    24. IMPORTANT: After filling the cooling system, the extraction hose can be used to remove excess coolant to achieve the proper coolant level.
  24. Detach the vacuum hose from the vacuum gage assembly.
    25. Fig 12: Attaching Extraction Hose To Vacuum Hose
    GM1617450Courtesy of GENERAL MOTORS CORP.
  25. Attach the extraction hose to the vacuum hose.
    26. Fig 13: Opening Valve On Venturi Assembly To Start A Vacuum Draw
    GM1617453Courtesy of GENERAL MOTORS CORP.
  26. Open the valve on the venturi assembly to start a vacuum draw.
    27. Fig 14: Using Extraction Hose To Draw Out Coolant
    GM1617456Courtesy of GENERAL MOTORS CORP.
  27. Use the extraction hose to draw out coolant to the proper level.
  28. The vacuum tank has a drain valve on the bottom of the tank. Open the valve to drain coolant from the vacuum tank into a suitable container for disposal.
  29. Install the surge tank cap.
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