I can share some data on this learned through experience when I hit a curb stop and broke the fan on my W210.

It happened in the hot summer here, it was in the high 80s/30 C.

Engine ran about 15 degrees hotter, usually I am at 80C and it was running at close to 100.

A/C performance was terrible. The engine driven fan is needed to pull air through the condenser foe effective heat transfer.

Also the electric front fan control on the W210 is electronic, there is a PWM? controller up front. Not the simple 2 relay and resistor setup like on the 124.

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The OM 642/722.9 powered family
Still going strong
2014 ML350 Bluetec (wife's DD)
2013 E350 Bluetec (my DD)

both my kids cars went to junkyard in 2023
2008 ML320 CDI (Older son’s DD) fatal transmission failure, water soaked/fried rear SAM, numerous other issues, just too far gone to save (165k miles)
2008 E320 Bluetec (Younger son's DD) injector failed open and diluted oil with diesel, spun main bearings (240k miles)

1998 E300DT sold to TimFreeh
1987 300TD sold to vstech