I can't find the low pressure fill to refill my AC. Have the system drained and got a vacuum on it but can't find the fill. Its a 03 suburban with rear air. I bet it will be the same place as any NBS truck. Let me know please...

 

Itll use the same hi and lo schraders under the hood

 

check the compressor inlet, thats the low pressure side and typically where refrigerant is added, good luck

 

I don't have a picture and my truck is across town, but isn't it on the accumulator?

 

our problem was the hose we were using to fill it was bad so i thought we might have been using the wrong port. got it all figured out but my ac still sucks... might have something to do with my knocking AC compressor...