So for the past five years plus I have been running OM605/6 N/A and 962 turbo without the customary viscous fan.

My current set-up has been slightly modified due to swapping out a 962 head for 910, during the swap also changed over lower temp thermostat - from memory the standard 910 thermostat opens at 85, 962 at 80 Celsius.

Today here is blightly it was hot, really hot temps of around 29 c were experienced plus today was also a road trip of 140 miles or so, during which encountered several long jams.

The good news (and the reason for this post) no overheating, top temp reached 83c according to dash gauge.

Coolant is 75/25 distilled water which may help, but thought it worth posting.

Cheers.

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)

How did you fit a fixed fan? U.S. cars use the same bolt pattern at the water pump, and there are many sizes of fan spacers, but most U.S. fans are likely too thick, at least for my W123 cars. There are after-market nylon and aluminum flex fans which are thinner, so "should work".

I have been dealing w/ temps creeping up when idling in my 1985 300D. It has gotten to 115 C on hot days when idling for 5 min at a red light. A "hot day" here in the CA Central Valley means 44 C (111 F for you colonists). If I rev the engine or start moving, the coolant temperature quickly drops. I have tried many things - water pump, radiator, changed to pure water for a week, T-stats, clutch-fans, ... I am pretty sure it is due to the fan, so I will try a 3rd one (or 4th, lost count). It seems many of the clutches lose their silicone fill over time. There are posts on refilling one. BTW, my 1984 300D never overheats.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Bill, no additional fan just removed viscous and shroud.

I would point out that mine is not fitted with a/c, any additional load such as a compressor may push temps up.

(Driving up long steep gradients en route to Las Vegas signs suggesting switch off a/c keep engine cool)

Benefits, winter times it may heat up slightly quicker, possible fuel savings as not turning a large propeller and lastly quieter.

I think its very much dependent on where you live, spec of car ect..lots of variables which may not make it suitable for everyone.

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)

^ Very true. Fanless works where your driving habits produce lots of airflow across the radiator and/or climate is cooler. If you have A/C and commute in stop-n-go traffic, your engine *will* overheat without a fan.

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1998 E300 turbodiesel

America's Rights and Freedoms Are Not The Enemy!

Yep, we have a moments here like now 26 - 28c but this is unusual, that said it seems make little difference to engine temp.

I think it's one of those things you have to be conscious of in case there are issues.

On my W210 there was one instance boarding the Euro Star train to France, it was maybe 45 minutes stop/start then once on-board it was a closed carriage, from memory it nudged over 90c at which point i put the heater on, lol

As mentioned, it's not a blanket suggestion more of 'this is what I have been doing' type post.

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David


1996 Mercedes S124 E300TD - 129k - rolling restoration project -

1998 Mercedes W210 300TD - 118k (assimilated into above vehicle)