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Mr. Roo
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Only thing i can think of is that depending on the temperature in the country of its origin perhaps the radiator made it run too cold or hot, so maybe this was a stop gap for that country?
This is what I was thinking too. In a colder climate/country, you wouldn't need or want the coolant getting so cold and freezing out in a radiator all the time. I've never heard of any sort of thermostat for the transmission fluid. So perhaps this mechanism is something similar to that (I can see it has 3 lines connected to it) that allows it to either be heated or not, rather than constantly cooled.
 
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