[Phil]

Dean
The evaporator should see about 50 or 60 psi when the system is idle and about 35 or 40 when running so plug one end and hook up a regulator with air pressure and do the old inner tube trick by submerging it in a tub of water...sounds hokey but it works. Diagnosing a leak in the evaporator on the vehicle is really difficult so make sure of its integrity before re-installing it.
Cheers
Phil