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The transmission cooler is in the radiator, where the cooler (exit) coolant flows into the engine. For those short trips you describe, the transmission fluid probably does not reach it's normal operating temperatiure.
Even on longer trips the thermostat will open more if tranny coolant temps casue the engine coolant to be significantly hotter.
I would worry more if you encountered significant grades for miles which would cause greater demand on the radiator for cooling both the engine and transmission.
On the old Chrysler Corp Plymouth State Police cars, they blocked the tranny cooler lines off. Even automatics radiate alot of heat from the transmission case itself.
Always good to minitor the temps anyway, but short hauls will never overheat a transmission.
regards
mech
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