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Home >> Chevrolet >> 2000 >> Cutaway 7.4 J >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Manual >> Operation >> Main A/C-Heater Control Module >> Mode Controls

Mode Controls

Front air delivery or ventilation is controlled by vacuum. Air delivery valves or doors are operated by 4 vacuum actuators. Each actuator is spring loaded for a normal position and will change position when a vacuum is applied. When vacuum is removed, actuator returns to normal position.

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