Russ, do this: start your car, turn both front and rear A/Cs on, run them for a few minutes to allow freon to reach the rear lines. Apply emergency brake & block four wheels. Now crawl under the car (like you did before) and feel the metallic A/C lines; one of these is the return line and is supposed to be hot, so just barely/quickly touch 'em with your finger to identify which one is cold. Hold the cold line; if it is quite cold to touch, it means freon is reaching here. My guess is that the other line (supposed to be very hot) should not be hot in your van and it would mean freon is not going thru the evaporator, i.e., a block in the evap core filter or core itself. Do this test and post back. Good luck. | 
