I wonder what fan the seller is talking about? must be the aux fan. otherwise, the car would be unsafe to drive...
likely his fan clutch is shot, and the aux fan no longer can maintain temp due to the heat and the constant need...
#17 head is a pull from another car, or the motor itself is from another car... I don't think MB sold the 17 head separate from the motor... 18 was the first I think. either way, I'd need a coolant test for combustion gasses, and an oil test for glycol before I'd consider that wagon for over 1500... even if the rest of the car is near pristine, and it's low mileage.

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John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread
"as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do!

My drivers:
1987 190D 2.5Turbo
1987 560SL convertible
1987 190D 2.5-5SPEED!!!

1987 300TD
2005 Dodge Sprinter 2500 158"WB
1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere!