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I just looked at my Sentra. The radiator is a top-bottom tank type, not crossflow.The reverse flow cooling system feeds the hottest coolant to the transmission cooler which is in the bottom tank, exactly the opposite of normal. This heats the cold transmission fluid and warms it up instead of cooling the fluid. Once the transmission reaches a temperature above the 169.7 (76.5C) thermostat opening point then the transmission fluid is cooled to maintain a consistent temperature.
In regular flow systems the transmission fluid cooler is in the opposite location, where the coldest fluid in the radiator is located.
There it is "heating the transmission fluid with engine heat" in 1992.
regards
mech
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