Hi, I have an '05 Cummins Diesel and the A/C needsa shot. I see an A/C port located at the front left of the engine compartment but the diameter is larger than a normal R134 fitting. Anyone know the location of the low pressure port? Thanks

I can tell you where it is located on a 2nd gen but not on a 3rd gen.

Both are on the left side one up front by the air box and straight back by the coolant is the other and that is the low side