Small leaks can be difficult to pinpoint. There are dyes that can be added to the coolant that will glow when seen with a black light. You can try installing a pressure tester. It is a small hand pump that pressurizes a cold cooling system to simulate a hot pressurized system. I would remove the torque converter inspection cover and pressurize the system. My guess is that a freeze plug on the back of the motor is leaking. With the age and mileage of the van it may not be worth the cost of dropping the transmission to fix the leak. At this point you can just monitor the leak to make sure the coolant doesn't get too low. You can also try one of the numerous chemical coolant sealant additives available. Which ever choice the leak will get worse over time.
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