2000 Bravada AC Low Pressure intake, Where is it?/

I have a 2000 Olds Bravada that just spent 6 weeks sitting in my garage. When I got back, the air was lukewarm, but it was cold before. I got a can of refrigerant, but cannot find the low pressure side valve to connect the canister to to recharge the system. Where is this valve, Oklahoma is 101 today.

I can’t help here, but this would be a good post for OK4450 to answer. V6?