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Need info on transmission

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Hi. I’ve researched and cannot seem to find a straight answer on what I am searching for.

I have a 2016 Chevy Silverado 2500HD LT Z71 gas with the 6L90 transmission. My question is: was this truck made with the temperature valve that only opens the trans oil to the auxiliary cooler once it reaches a certain temperature? Or is it continuous flow regardless. 
I’m towing a 7500 travel trailer and live in FL, so may be thinking about doing modifications to it to keep the temps down as most of my traveling will be in 80-100 degree weather

Edited by evbaseball6
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