Auto-trans question: How much does having the fluid cooler help?

Hello everybody,

I've seen a lot of discussion about overheating issues on the
4-cyl/auto equipped Toyhouses.

Does having a trans fluid cooler help significantly? My '86 Dolphin is
equipped with one and an old National RV/Dolphin brochure that came
with the coach indicates that they added that feature in mid-1985.

Also, my dash has a "Trans Temp Warning" light. Will that be enough to
ward off serious trouble or should I get an actual gauge to monitor
trans temp?

Thanks for your input

Buzz L.
Currently in Mesa, AZ