What are the most common causes of engine overheating in an Audi 80?

I recently purchased a used Audi 80 and noticed the engine temperature rising on hot days. I checked the coolant level and it's fine. What are some other potential causes for engine overheating in this specific model?

The most common cause of engine overheating in an Audi 80 is a malfunctioning thermostat. This can cause the engine to run too hot and result in overheating. My advice is to have the thermostat checked and possibly replaced if necessary.