Summers coming and I need to recharge my A/C

[SOUTHERN]

RE: 2004 Yukon, AWD 4door

Does anyone know where to find the low pressure port on the return ac line. All I can find are two high pressure ports on the compressor discharge line.



Thanks,
Southern

 

[72hotrod]

Low side is on the firewall side of the orifice tube, high side is on the radiator side, both in the line between the condenser and evaporator.