What is a common issue in the Audi 80's cooling system?

I recently purchased a used Audi 80 and I am experiencing some temperature issues. The temperature gauge fluctuates frequently and I am not sure what could be causing this. Can anyone provide insight into common issues with the cooling system in this car?

One common issue with the Audi 80's cooling system is a faulty thermostat. If the thermostat is not functioning properly, it can cause the temperature gauge to fluctuate and potentially lead to overheating. I recommend having a mechanic check and replace the thermostat if needed.

Another common issue in the Audi 80's cooling system is a clogged radiator. Over time, debris and sediment can build up in the radiator and prevent proper cooling. It is important to regularly flush and clean the radiator to avoid potential overheating.