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The arrows in the diagram seem a little misleading... Showing cold in (blue), hot out
(red) at the lower rad cooler.
You want HOT in from the transmission, to the lower rad cooler.
Rad cooler out, to the aux cooler.
Aux cooler out, back to transmission.
2-stage cooling.
Your arrows looks like you're going through the cooler first, then to the rad.
You don't want that, if that is the case. You're just sending the aux cooler fluid
back to the rad to be raised to engine coolant temperature.
If you want RAD to AUX, then AUX to TRANS, then cool, but the arrows
in the diagram don't show that, specifically.
Aux coolers are the best thing you can add for longevity. I added a medium duty
cooler to a former 2000 Avenger ES a week after purchase, and went 153,000 miles,
and even towed a boat for a season. The A904 was notorious for heat caused
failures, and to go 153,000 on one was fantastic. IT still ran at trade in, and I saw
it on the road for at least a year afterwards.
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