Hello, I’m installing a transmission cooler on my sedan that bypasses the factory cooler in the radiator. I’ve included a thermostat and a thermal fan switch but, haven’t been in able to find anything about which direction the transmission pumps fluid. The thermostat I’m using is directional and I need to put the switch on the cold side of the cooler. Does anyone know? Maybe I missed something in the FSM?

 

The first image is what i found in the FSM. It seems to indicate that the line closest to the bell housing is the outlet
I installed my trans cooler in-line with the stock radiator cooler using the trans line closest to the radiator hose as shown in the stillen kit instructions in the 2nd image below.

 

The transmission already has a thermostatic valve internally.
An inline one is redundant and just another component to fail/leak.
My advice is to install a valve body kit. The only two available for our transmissions fix the overpressure issue that cause leaks in the first place. Among other improvements!

and make sure to use transmission pressure rated hoses and fittings/clamps.

I too put thermosthermostatically switched fans on my external coolers.

 

I did not know there was a thermostatic valve in the transmission. Do you know if this is this normally open or closed during warmups? Originally I added the inline thermostat to help the transmission warmup because it won’t be able to exchange heat with the engine coolant anymore.