How to fix a malfunctioning air conditioning system in an Audi A3?

I have noticed that my Audi A3's air conditioning system is not working properly. The air blows out warm and there is a strange noise coming from the vents. What could be causing this issue and how can I fix it?

First, check the air conditioning compressor to see if it is functioning properly. If it is not, it may need to be replaced. Additionally, check the refrigerant levels and make sure they are at the appropriate level. If they are low, you may need to refill the refrigerant or have a leak repaired. It is also possible that there is a blockage in the system. If none of these solutions work, it is best to take your car to a certified Audi mechanic for further diagnosis and repairs.

One possible cause of the malfunctioning air conditioning could be a faulty AC clutch or a broken AC belt. You can inspect these components yourself or take your car to a mechanic for a thorough inspection. It may also be helpful to check the cabin air filter and clean or replace it if necessary. If all else fails, take your car to an Audi dealership for professional assistance.