How to troubleshoot no heat in Audi 80?

I've noticed that my Audi 80 isn't emitting any heat when I turn on the heater. How can I diagnose and fix this issue?

The first thing you should check is the coolant levels in your car. Low levels or air pockets in the system can prevent proper heat distribution.

If your coolant levels are normal, the issue may lie with a faulty thermostat. This component regulates the temperature of the coolant and can impact the heating system.