Copied and pasted from another forum!! :toothy10:
The orifice tube is located in the high pressure line where the line enters the evaporator.
There are 2 tubes on the evap.: a 3/4" line at the top with the aluminum cylinder (accumulator - drier), and a 3/8" line at the bottom. The orifice tube is located in the 3/8" line at the tubing joint where it enters the evap.