Hummer H3. Manual — part 1103

Fig. 9: Attaching Shop Air Hose To Venturi Assembly
Courtesy of GENERAL MOTORS CORP.

9. Attach a shop air hose to the venture assembly.

Ensure the valve on the venture assembly is closed.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Fig. 10: Attaching Vacuum Hose To Vacuum Gauge Assembly & Vacuum Tank
Courtesy of GENERAL MOTORS CORP.

10. Attach the vacuum hose to the vacuum gage assembly and the vacuum tank.

11. Clamp off the overflow hose.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Fig. 11: Opening Valve On Venturi Assembly
Courtesy of GENERAL MOTORS CORP.

12. Open the valve on the venture assembly. The vacuum gage will begin to rise and a hissing

noise will be present.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3

Fig. 12: Monitoring System Vacuum
Courtesy 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.

2007 Hummer H3

2007 ENGINE Engine Cooling - H3