456 GTA AC Not Blowing Cold Air

Hello! Hope you are all healthy and safe.

I'm trying to fix up 1997 456 GTA which was left plugged in but unused for a few months. Engine wise, it works fantastic, but am having some issues with the AC (in Florida, so AC is pretty fundamental). More specifically, it blows air, but not cold one.

I know HVAC systems can be very complicated, so I wonder if you guys have any quick and easy fix that might do it (ie cooling liquid low or some easily reachable/replaceable component), to try and troubleshoot if it's a real problem or something easier?

Thanks a lot - full disclosure: I'm a computer scientist who loves getting hands dirty with Mech-E but is not as qualified in it. So apologies in advance for some of the more stupid/naive questions!

 

Great thanks! I actually just purchased the kit from amazon and will attempt at doing it on my own (always good to learn new things ). Do you happen to know where in the car the freon cap is located? Find attached the diagram of the HVAC system (is it #2?). Thanks!
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