Regarding this subject: the third (93-99) gen DOES have an air separator tank
(the actual "radiator cap" is there, which is not to be confused with the
"coolant fill cap" on top of the pump housing), as well as a coolant recovery
tank (where you 'actually' add coolant on the road {after a coolant change}).
The air separator is an extension of the lower inaccessible radiator and does
just that-it is internally baffled and separates the slower moving air from
the residual water and expels air and water and recovers coolant from the
recovery tank.  It is about equal in height above water line to the pump cap.
Both caps are higher than the radiator.The "separators" are plastic, and many
have been replaced with al tanks (like PFS sells, as well as others) due to
seam leakage and bursting. It is a pressure tank.
BTW, my third gen (94 car) has been running 215-220F water temp and 190-195
oil temp on 99F OAT  on the highway at 70 mph with the ac on (turns on the
aux radiator fans to 'high")  at sea level.  As the OAT goes up so does the
water temp. Delta T up at altitude should help that in the aircraft use. Just
for your information. Wonder how much that intercooler really does in that
compartment-bet it is not much!
Marc Wiese 20B in something this way comes.....

 
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