1995 E320 / M104

REPOSTING THIS WITH CLEARER INFO:

Driving home last night I saw steam under the hood. After parking and opening the hood it was rising from the back of block from somewhere below the oil filter. The hood pad and the back of the plastic intake cover were wet, as if sprayed from below. Coolant level was about a pint low.

It appears I have a crack at the top of a hose since it does not leak when the engine is off or idling, but will shoot coolant straight up when rpms exceed about 2700 rpm, which I can see with the hood up and sitting in the driver's seat, revving the engine.

From what I can tell from my reading here, the possible hoses are the ATF collant (one of the two hoses is rubber??) or a heater-to-engine hose.

Am I missing any -- and is replacement straightforward if that becomes necessary (and if it is not just a slipped hose).

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2008 E350 4matic / Black/Anthracite

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Gone but not Forgotten:
2001 E430 4matic, 206,xxx miles, Black/Charcoal
1995 E320, 252,xxx miles, Black/Grey
1989 260E, 223,00 miles, Black/Black