Transmission problem
1997 Dodge Caravan 6 cyl Front Wheel Drive Automatic 118500 miles
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when water is poured in radiator, it is leaking back out this vent valve on top of the transmission housing right where the shift linkage is at. Everybody we talk to says no way. The crazy thing is that it is and no idea why.

Sounds like to trans cooler in the radiator is bad and allowing the water to get to the trans. What does the coolant look like? What does the trans fluid look like when you check it?