Looking for some guidance on how to diagnose the issue here. I'm very new to working on cars and general, and this vehicle was gifted to me recently. I'd like to try my hand at working on it myself, but have no idea where to even begin. Does anyone have good resources on diagnosing AC problems? Fans work on all settings, but cold air does not come out.

 

You’ll probably get better advice in this forum:

https://www.jaguarforums.com/forum/xj40-xj81-25/

(see the “What XJ6 Do I Have?” sticky…).