Koolaire KDT0300A Technician's Handbook page 57

Evaporator Tubing Routing
Routing of the tubing on the back of the evaporator
determines the ice fill pattern failure mode.
One Evaporator, One TXV Models
The evaporator outlet tubing does not exit directly at the
top of the evaporator, but exits several inches below the
top of the evaporator. Extremely Thin at the Evaporator
Outlet will first be visible several inches below the top of
the evaporator. Extremely Thin at Evaporator Inlet will first
be visible at the bottom of the evaporator.
ICE
Outlet
ICE
Inlet
Thin at Inlet Thin at Outlet
Part Number STH063 9/17 57