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Fig. 11: Attaching Shop Air Hose To Venturi Assembly 9. Attach a shop air hose to the venture assembly. Ensure the valve on the venture assembly is closed.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 12: Attaching Vacuum Hose To Vacuum Gauge Assembly & Vacuum Tank 10. Attach the vacuum hose to the vacuum gage assembly and the vacuum tank. 11. Clamp off the overflow hose.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 13: Identifying Valve On Venturi Assembly 12. Open the valve on the venture assembly. The vacuum gage will begin to rise and a hissing noise will be present.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
Fig. 14: View Of Vacuum Gauge 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.
2008 Chevrolet Silverado 1500 2008 ENGINE Engine Cooling - Cab & Chassis Sierra, Cab & Chassis Silverado, Sierra & Silverado
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