How to troubleshoot a malfunctioning air conditioning system in a Vauxhall Zafira Life?

I noticed that my Vauxhall Zafira Life's air conditioning system is not functioning properly. There seems to be a strange sound coming from the vents and the air is not as cool as it used to be. What could be the possible causes and how can I fix this issue?

First, check if the air filter is clean and not clogged. This could be causing the reduced cooling in your car. If it is dirty, replace it immediately.

Another possible cause could be a refrigerant leak in the system. This can be checked by a professional mechanic who can use a special dye to locate the leak and fix it.

It could also be an issue with the compressor or the condenser. These are vital components of the air conditioning system and should be checked and repaired if necessary.