Front Defrost Mode

The front defrost mode is the only setting that is not controlled by the automatic HVAC system. When FRONT DEFROST is selected, the A/C compressor is activated and ambient air is brought into the vehicle. The blower motor will be activated and air will be directed toward the windshield with a small amount of air toward the side window outlets. Vacuum is applied to the mode actuator through the red vacuum line. The mode actuator will retract, closing the heater door through mechanical linkage. Pressing the AUTO or OFF button will turn off front defrost mode. Recirculation mode is not available in front defrost. The rear window defogger does not affect the HVAC system at all.