confirm that the low port for an ac recharge

Here is video that shows how to find the low side fitting and a guide to help as well with diagrams below.

https://youtu.be/uZrQCGwXfek

and

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

Check out the diagrams (Below). Please let us know if you need anything else to get the problem fixed.

Cheers