Hyundai Sonata: Convenient features of your vehicle / Defogging logic

To reduce the probability of fogging up the inside of the windshield, the air intake or air conditioning are controlled automatically according to certain conditions such as or position. To cancel or return the defogging logic, do the following.

Manual climate control system

1. Turn the ignition switch to the ON position.

2. Press the defroster button () within 10 seconds.

3. Press the air intake control button at least 5 times within 3 seconds.

The indicator on the air intake button blinks 3 times with 0.5 seconds of interval. It indicates that the defogging logic is canceled or returned to the programmed status.

If the battery has been discharged or disconnected, it resets to the defog logic status.

Automatic climate control system

1. Turn the ignition switch to the ON position.

2. Press the defroster button ().

3. While pressing the air conditioning button (A/C), press the air intake control button at least 5 times within 3 seconds.

The climate control information screen will blink 3 times with 0.5 seconds of interval. It indicates that the defogging logic is canceled or returned to the programmed status.

If the battery has been discharged or disconnected, it resets to the defog logic status.

Automatic Climate Control System
To defog inside windshield 1. Select desired fan speed. 2. Select desired temperature. 3. Press the defroster button (). 4. The outside (fresh) air position will be selected automatically. If the out ...

Climate control additional features
Automatic Ventilation When the ignition switch is in the ON position or when the engine is running and outside temperature is below 59°F (15°C). At the same time, when A/C mode is off and mode is ...

Other information:

Hyundai Sonata LF 2014-2019 Service Manual: Repair procedures
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Hyundai Sonata LF 2014-2019 Owners Manual: Vehicle Load Limit
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