What could cause abnormal engine temperatures in an Audi 80?

I have noticed that my Audi 80 is running at higher temperatures than usual. What could be causing this and what steps should I take to fix it?

There are a few possible reasons for abnormal engine temperatures in your Audi 80. It could be due to a malfunctioning thermostat, a leak in the cooling system, or an issue with the radiator. It's important to have a mechanic diagnose and address the issue as soon as possible to prevent any further damage to your engine.