on my w124 300td before i put my 722.6 in, the metal atf cooler line runs above the radiator and i'd always joke with my buddies that i was pretty sure lava ran through it lol. If you sprayed water on it after a good drive, it would turn to steam quickly. That transmission had a real slushy torque converter anyways so all it was good for was warming up the car faster on a cold day

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83 300CD- sanden, dual p/f condensers, 160a alternator, ect
91 300TD- 722.6, #22 head, 3.5L IP, w140 manifolds, ect