Where exactly is this port located on the 2003 chevy blazer. I am trying to recharge my ac but i found 2 ports with black dustcaps.. One on a U bent metal going from the bottom of the evap it looks like and into a giant black box (cant really see where all the hoses are going) and one is on the side of a Delphi Temp cylinder... Which should i use to recharge...

 

Use the one that the recharge fitting fits onto... They are different sizes, HP is larger than the LP if I remember correctly.

*Moving to 2nd Gen Tech* - Please choose the appropriate forum section within General Tech to better segregate the information.

 

When my AC is on max the pressure is about 65 psi.. when teh AC cuts off it climbs to the 150 psi range...
I know i cant recharge it because the pressure is to high but is there anything to look for before i take it to a mechanic

 

I am an idiot.. for some reason when i saw put it on max a/c i put the switch to max a/c and the other one all the way up to 4.. that explains why my pressure was so high.. i dropped it to 1 and it dropped to the fill mark and charged the a/c.. works great now..