Windshield defrosting and defogging

Windshield heating

Do not use the position during cooling operation in extremely humid weather. The difference between the temperature of the outside air and that of the windshield could cause the outer surface of the windshield to fog up, causing loss of visibility could cause an accident resulting in serious injury or death. In this case, set the mode selection to the position and fan speed control knob to a lower speed.

For maximum defrost performance, set the temperature control to the highest temperature setting and the fan speed control to the highest setting.
If warm air to the floor is desired while defrosting or defogging, set the mode to the floor-defrost position.
Before driving, clear all snow and ice from the windshield, rear window, side view mirrors, and all side windows.
Clear all snow and ice from the hood and air inlet in the cowl grill to improve heater and defroster efficiency and to reduce the probability of fogging up the inside of the windshield.

If the engine temperature is still cold after starting, then a brief engine warm up period may be required for the vented air flow to become warm or hot.