How to troubleshoot the engine overheating in an Audi 80?

I recently experienced my Audi 80's engine overheating while driving. What could be the likely cause and what steps should I take to troubleshoot and solve this issue?

One possible cause of engine overheating could be a malfunctioning radiator fan. Check if it is working properly and replace if necessary. Additionally, make sure your coolant levels are correct.

Another possible cause could be a faulty thermostat. It is responsible for regulating the engine's temperature and if it is stuck in the closed position, it can cause overheating. Consider replacing it.