What are common issues with the Vauxhall Astra's air conditioning system?

I've noticed that my Vauxhall Astra's air conditioning is not working as well as it used to. What are some common problems that could be causing this issue and how can I fix it?

One possible issue could be a low level of refrigerant in the system. This can be fixed by getting the system recharged at a service center.

Another common problem is a faulty compressor, which is responsible for cooling the air in the system. This will need to be replaced by a mechanic.

It's also important to regularly change the cabin air filter, as a dirty filter can restrict air flow and reduce the efficiency of the AC system.