Trans cooler

Putting a trans cooler on my 2021 4runner. Does anyone know Wich trans line that comes in on the bottom of the radiator is the in line. Driver side or passenger side?

 

Can't believe no one knows the answer to this

 

Drive the truck around and get it to operating temp. Then touch each line and see which one is hotter. The hotter one is the one from the tranny. The cooler one will be going to the tranny. Install your air cooler on the cooler line. Dont forget to add some ATF after you install it. Good luck.

 

*Snaps fingers* .... follow the flow of the coolant from the Engine Next to where the hot water go's in from the engine is also a fitting for the oil in and then on opposite side is the exit end. this thread shows it well.
https://www.4runners.com/threads/towing-package-include-a-tranny-cooler.19039/

 

Thanks Guys this is the info I was looking for.