Vehicle Specifications

Windshield Defrosting and Defogging

~1min read

WARNING - Windshield Defrosting

Do not use or position during cooling operation in very humid weather. The difference between the outside air temperature and the windshield may cause fogging on the outside surface of the windshield, resulting in loss of visibility. In this case, set the mode selection to position and set the fan speed to a lower speed.

  • For maximum defrosting, set the temperature control to the far right (HOT) position and the fan speed control to the maximum speed.
  • If warm air to the floor is required while defrosting or defogging, set the mode to the floor defrost position.
  • Before driving, clear snow and ice from the windshield, rear window, outside rearview mirrors, and all side windows.
  • Remove all snow and ice from the hood and the hood air intake grille to improve heater and defroster efficiency and reduce the possibility of fogging on the inside of the windshield.

Test yourself

A quick Kia Optima DL3 quiz: every answer comes with an explanation and a link to the manual page.