I live in South Louisiana and my A/C is not working correctly! Help! I bought one of those canisters to check the pressure and recharge the coolant if necessary, but I'm pretty sure the connection is wrong. Either that or I have the wrong port. The port I'm trying to use is front and center when you open the hood, on the bigger of the two tubes coming out of the compressor. Do any of you know if you need some special connector to charge the A/C? Or if I'm using the right port? I have a 2015 Ram 1500 Big Horn with the 5.7L Hemi.