Quite Simple angbrian
Brother of The Benz, angbrian
Your W124 radiator has it's fluid tanks vertical on each side of the radiator assembly.
In the passenger's side tank there are cooling coils. There are two lines attached to fittings on the tank.
Transmission fluid circulates through the cooling coils and the fluids heat is removed by the engine coolant.
Have a look see!
Happy Trails Beep Beep from The Spiderman in Houston!!!