How to heat the rear window and mirrors in a Kia EV4
The rear-window defroster also operates the EV4’s documented outside-mirror defogging function. You can therefore use one climate control when moisture or frost is affecting those rearward views.
Checked against the MY2027 English owner manual for this model on 27 October 2026. Equipment and software can differ; use the instructions and controls fitted to your own vehicle.
Touch the rear-window defroster icon. Its indicator illuminates while active, and the system switches off after approximately 20 minutes or when the vehicle is turned off.
Before you start
Identify the rear-window symbol before setting off; it is a separate function from front-windscreen airflow. Check the actual glass and mirror surfaces before driving.
Follow these steps
Tick steps as you go. Your progress stays in this tab.
Check the result
The documented automatic stop is about 20 minutes. Turning the vehicle off also stops the function, and switching back to POWER ON or DRIVE READY does not restore that previous defroster operation automatically.
Common questions
Do the outside mirrors have a separate step in this procedure?+
The manual says their defogging operates with rear-window defogging.
Will it resume after I restart the vehicle?+
The manual says it returns to off after the vehicle has been switched off.
SOURCES & SCOPE
Where this guide comes from
Written from the official references below. Reviewed on 27 October 2026. This is a source-based guide, not a claim of hands-on vehicle testing.
Read our editorial policy