'90V8Q-Transmission Cooling??

[rich maloney <ram1@mindspring.com>]

 I have a 1990 V8 Quattro and am dealing with an ongoing transmission
problem. It is my understanding that the transmission fluid is cooled by
flowing through a transmission cooling system that is in the radiator.
Correct?

1) What temperature range should that fluid run going "into" the cooling
system? What should it be coming out? 
2)When the hose at the bottom only is detached t-fluid comes out. When the
hose at the top only is detached t-fluid comes out. Shouldn't the t-fluid
only come out of the the hose which sends it back to the transmission not
the one that intakes the heated fluid? Or is this result of some kind of
vacumn etc. Just want to know if it is normal?
3)Where (ie manual etc) would I find information on the workings of the
transmission cooling system in this car?

Any other ideas why my fluid seems to overheat (more noticeable in hot
weather with AC on)? After it gets too hot then I get spillage from the
overflow hole.

Any ideas appreciated.
rich <ram1@mindspring.com>