3rd gen > all others
Depends if your van has the oil cooler or not. Vans with the oil cooler will NOT have that tube on the rear of the engine block. It will be on the FRONT of the engine, under the front exhaust manifold, and arc over the transmission (underneath the exhaust crossover pipe). Also above the transmission in that area is the thermostat housing that could leak/drip down, and the end of the engine where a leaking lower intake manifold gasket could trickle coolant down there.