Where is the low service port located on the 05 chevy cobalt ?

LOOK ON THE LOWER BACK SIDE OF ENGINE LOWER FIREWALL.YOU SEE EVAPORATOR LINE WITH A BLUE OR BLACK CAP ON IT.THATS THE CHARGE PORT.

Find the ac compressor,then look for to ac lines coming from it,and follow the large ac line until you come to it,this is the low side service port,If this was helpful,please rate,thank you.

So when i turn on my aircon the tube getting cold thats the low ,port coz the vcolor black both the top 1 black number 11 the side black number 10