How can I make sure my Audi 80's heating system is working properly during the winter?

I have an Audi 80 and I live in a cold climate where it gets below freezing temperatures in the winter. I want to make sure my car's heating system is functioning properly before the winter season begins. What are some steps I can take to ensure this?

First and foremost, make sure to regularly check and replace any worn out or clogged air filters in your Audi 80's heating system. This will help maintain proper air flow and prevent any potential issues during the winter. Also, consider getting a tune-up for your car's heating system, including checking the thermostat and cleaning any debris or buildup in the system.