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Just Some Dude in Jersey
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In recent years I have switched from running my GT's fluid lines to an oem auto tranny configured radiator to, instead, running the coolant lines to an aftermarket auto tranny fluid cooler with a built in fan. It's about 12"x12" of all cooling fins, it's probably way bigger than I need, and could maybe even cool the fluid enough without the fan ever coming on. I guess. But just to be on the safe side, I have the fan set to turn on when my back-up radiator electric fan comes on. I use an engine fan AND an electric fan on my GT's 2.4 engine. I have the adjustable thermostat fan controller set to turn on both fans at about 200 degrees.
I have no idea what temperature range the tranny fluid in our TH180 trannies should stay at. I don't want the fluid to get too hot and get degraded. I've been using this set up for about 5 years and my tranny and fluid seem just fine. But I have no idea how hot the fluid gets before the fans kick on, nor do I know how cool the fluid gets when they do turn on. I'm seeking guidance on this matter. Your thoughts and research?

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Apologies if this doesn’t help. I’d guess you couldn’t go too wrong if a good working temperature was somewhere in the mid range of the fluids rated operational temperature range.
 

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I'm sure someone smarter than I could crunch some numbers But If the thermostat opens at a set temp to keep the engine cool and the clutch fan( in this scenario) energizes at a set temp to aid in stop and go traffic scenario and in most vehicles that have the trans cooler in the radiator or a separate cooler but still in line with the radiator.
Would a good guess be somewhere between say 180 to 200 on the high end and say 170 to 190 for our opels?
 
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