Where is the low pressure valve to recharge the air conditioning system?

Hello,

Here is a video of tips to find the low side A/C port:

https://youtu.be/ON2dYcmXIAw

You also might find there articles helpful on how to recharge:

https://www.2carpros.com/articles/air-conditioner-how-to-add-freon
https://youtu.be/4EqdrBVb0sY

Please let me know if you have any questions.

Thank you.