How do I fix the heating system in my Audi 80?

I've noticed that my Audi 80 is not producing warm air when I turn on the heat. What could be causing this issue and how can I fix it?

It is possible that your heater core is clogged and needs to be flushed. This can be caused by build-up of debris or sediment in the system. To fix this, you can try using a radiator cleaner or take your car to a mechanic for a professional flush.

Another possible cause could be a malfunctioning thermostat. This can prevent the heater from producing warm air. You can test and replace the thermostat yourself or have it done by a mechanic if you are not familiar with car repairs.

Check the coolant levels in your car as well. If they are low, it can affect the heating system. Make sure to top off the coolant if needed and check for any leaks.