Hummer H3. Manual — part 1104

Fig. 13: Slowly Opening Valve On Vacuum Gage Assembly
Courtesy 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 venture assembly.

17. If there is a suspected leak in the cooling system, allow the system to stabilize under vacuum

and 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.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Fig. 14: View Of Vacuum Gauge & Radiator
Courtesy of GENERAL MOTORS CORP.

19. Once the vacuum gage reaches zero, close the valve on the vacuum gage assembly and

repeat steps 11-17.

20. Remove the J 42401 . See Special Tools.

21. Detach the Vac-N-Fill cap from the vehicles coolant fill port.

22. Add coolant to the system as necessary.

23. Inspect the concentration of the coolant mixture using J 26568 .

IMPORTANT: After filling the cooling system, the extraction hose can be

used to remove excess coolant to achieve the proper coolant
level.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

24. Detach the vacuum hose form the vacuum gage assembly.

Fig. 15: Identifying Extraction Hose
Courtesy of GENERAL MOTORS CORP.

25. Attach the extraction hose to the vacuum hose.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Fig. 16: Opening Venturi Assembly Valve
Courtesy of GENERAL MOTORS CORP.

26. Open the valve on the venture assembly to start a vacuum draw.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3