Thought I'd post this here so you guys know what your M103 cooling system should handle. Lots of posts here with members saying running up to 110C is OK -- No, it is not. If you are hitting this mark, you better have ambient temperature of 130F or start diagnosing right now since you are accelerating metal wear.

This is A/C on after a 30min, 20mile drive 110F ambient. Once I get my A/C back in order it should run a little cooler too since the condenser is running at high pressures and in turn raising my temperature.

Aux fans are running on LOW with A/C on, 79C thermostat, Nissens Radiator (10k on it), Graf water pump (30k), Zerex G-05 + distilled water roughly about 40% concentration that's all cooling replacement I've done. No water wetter garbage. Just a pressure tight, flowing system.

Happy summer cooling!

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Thanks for the detailed setup. What's the 79C thermostat you're referring to? I assume it's not the stock version? What's the part # and / or where you got it from?

Thx

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1993 300CE

Stock version is 87C, but Behr makes a 79C. No issues running it. Obviously if you live in cold climate don't do it.

Part # 1002000715

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2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Why not if I live in a cold winter climate (summers are hot though)?

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1993 300CE

If your summers don't exceed 90F, you don't really have a need for it.

__________________
2016 Monsoon Gray Audi Allroad - 21k
2008 Black Mercedes E350 4Matic Sport - 131k
2014 Jeep Wranger Unlimited Sahara - 62k
2003 Gray Mercedes ML350 - 122k

Ok thanks

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1993 300CE