Press the button.
Air flows through the windshield air vents, the temperature is set to the highest setting, and the blower motor adjusts to the highest speed.
You can also use this setting to defog and clear the windshield of a thin covering of ice.
Note:
To prevent window fogging, you cannot select recirculated air when maximum defrost is on.
Note:
The heated rear window and heated mirrors also turn on when you select maximum defrost.
Note:
When maximum defrost is on, the air conditioning compressor may continue to operate even though you switch off the A/C.