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Home >> Chevrolet >> 1998 >> Chevy Express G2500, Van Cargo Extended, 4L60E/M30 >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Manual >> Operation >> Main HVAC Control Module (A/C-Heater Controller) >> 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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