Manufacturer Note: A/C low pressure tube asy - attaches from under hood 19E558 A/C line assembly to A/C pressure valves located under LH front door, Diesel engines, less high output (auxiliary) heater/AC, with heater/AC prep pack or prep pack deluxe (for aftermarket add-on), 3/4", Note: some vehicles may be originally equipped with a female type fitting at the A/C p, ressure valve. If so, this pressure valve along with its 5/8" to 3/4" union nut must be removed and