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 outside 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 and floor outlets. Pressing the AUTO or OFF switch will turn off front defrost mode. Pressing the FRONT DEFROST switch will return the HVAC system to the last operating mode. Recirculation mode is not available in front defrost. The rear window defogger does not affect the HVAC system at all.

The HVAC control module grounds the upper mode valve solenoid control and the mix-blend mode valve solenoid control circuits. When the solenoids are grounded, vacuum is supplied to both sides of the mode actuator. The mode door is held stationary.