Operation CHARM: Car repair manuals for everyone.

Front Defrost Mode

The front defrost mode is the only setting that is not controlled by the automatic HVAC system. When defrost is selected, by the vehicle operator, the A/C compressor is activated and outside air is brought into the vehicle. The blower motor will be activated, regardless of coolant temperature and air will be directed toward the windshield and side windows. Recirculation mode and the auxiliary blower motor are not available in front defrost. The recirculation icon, A/C OFF and auxiliary blower motor icon will flash on their respective displays if any of those switches are pressed when in front defrost mode. This indicates that these modes are not available. The rear window defogger does not affect the HVAC system at all.