This quick video shows the location of the A/C system's "L" low pressure valve (port) on the thicker (bigger) metal pipe in a 6th generation 2019, 2020, 2021, 2022, 2023 and 2024 Nissan Altima used to recharge the HVAC system with refrigerant (freon). Most new Nissan vehicles use R1234yf but you should check the sticker or valve cap to see if your older model year uses R134a. A/C Recharge Kit R1234YF - https://amzn.to/3NgdAyk A/C Recharge Kit R134A - https://amzn.to/43oYJH9 The Paul79UF YouTube channel is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon.