How can I troubleshoot low refrigerant levels in my Audi 80?

I've noticed that my Audi 80's air conditioning is not functioning as well as it used to. When I checked the refrigerant levels, they were significantly lower than what is recommended. What steps can I take to troubleshoot this issue?

The first thing you can do is check for any visible leaks in the refrigerant system. Look for puddles of fluid under the car or signs of oil residue around the hoses and connections. If you find a leak, it's best to take your car to a professional mechanic for repair.

You can also try adding a refrigerant sealant to the system. This can help seal any small leaks and prevent the refrigerant from escaping. Just be sure to follow the manufacturer's instructions carefully.