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Home >> GMC >> 1998 >> Envoy >> Repair and Diagnosis (Single Page) >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> HVAC System - Automatic >> Operation >> A/C-Heater Control Module >> Recirculation Mode
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Recirculation Mode

When recirculated air switch is pressed, the A/C-heater control module commands actuator to close air inlet door to outside air. Recirculation mode is available in panel/floor, panel and floor modes. Recirculation mode is not allowed in front defrost or floor/windshield modes because windshield fogging might occur.