How to troubleshoot a faulty heating system in an Audi A2?

My Audi A2's heating system is not working properly. It blows out cold air instead of warm air. What could be the cause of this issue and how can I fix it?

First, check the coolant levels in your car. If they are low, top them up and see if that resolves the issue. If not, you may have a faulty thermostat.

Another possible cause could be a clogged radiator. Take your Audi A2 to a mechanic and have them flush the radiator to see if that helps.

If the above solutions do not work, you may have a faulty heater control valve. Have a professional mechanic check and replace it if necessary.