You are going to have two of them but the high side which I assume you found is going to be located on an HVAC line. This is the discharge line.
The low is going to be on top of the accumulator. I am going to attach the info below that will show the details on this.
https://www.2carpros.com/articles/air-conditioner-how-to-add-freon
Please run through this info and let us know if you have other questions.
Thanks
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Sunday, May 8th, 2022 AT 1:21 PM