Why is the air conditioning in my Audi A6 not working?

I've noticed that the air conditioning in my Audi A6 is not functioning properly. It blows hot air instead of cold. What could be causing this issue and how can I fix it?

One possible reason for the malfunctioning air conditioning could be low refrigerant levels. You can check this by using a pressure gauge on the low-pressure valve. If the pressure is too low, you may need to recharge the system.

Another potential cause could be a faulty compressor or compressor clutch. If this is the case, it is best to take your car to a certified mechanic for repairs.

Sometimes, the issue could simply be a dirty or clogged cabin air filter. Check and replace the filter if necessary to improve the performance of your air conditioning.