Why is my Audi A3's temperature rising rapidly?

I've noticed that while driving my Audi A3, the temperature gauge has been rising much faster than usual. What could be causing this and what can I do to fix it?

It sounds like your car's coolant system may be malfunctioning. Check your coolant levels, and if they seem low, consider getting the system checked by a professional.

It's possible that your car's thermostat may be stuck closed, preventing proper circulation of coolant. Have it checked and replaced if necessary.