This video is single handedly the best video on the internet to not only recharge a Nissan 300zx air conditioning system, but also a step by step guide on how to convert from the R-12 refrigerant to R-134A refrigerant. This is a total DIY process that will help you diagnose/ assess how your air conditioning unit is working in a 1990-1996 z32. Enjoy, and don't forget to snag some merch and support the channel!