How do I troubleshoot heating issues in my Kia Ceed?

I've noticed that my Kia Ceed's heater is not working properly. What could be causing this issue and how can I fix it?

One possible cause could be a malfunctioning thermostat. You can try to replace it yourself or take your car to a mechanic.

Another reason could be low coolant levels. Check your coolant levels and add more if necessary.

A clogged heater core can also be to blame. You may need to flush out the heater core to fix the issue.