Quote:
Originally Posted by werminghausen
My 500SEL is running too hot for my flavor.
I have done everything I could to make the engine run cooler but no good results yet.
I flushed the system several time, installed a new visco fan clutch (Behr/China crap), new radiator, new water pump and new thermostat.
Still the engine is running at 90-100C degrees at all times.
The thermostat is the OE 84 C but still temperatures still running 10 degrees higher. Ignition timing is to specs.
The electric fan come on very often and I am at a loss.
My other Mercedes stay cooler and are much more stable around the thermostat temperature and a few degrees higher.
I have not changed the temperature sensors.
Any ideas what the problem might be?
Martin
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90-100C is perfectly normal. Its the way the cooling system on these cars was designed. I'm not sure about the specifics of your model, but the clutch fan on my '88 190E 2.6 does not fully engage until 100C and the twin aux. electric fans engage at high speed at 105C. Operating temperatures up to 110C are considered normal.
Emission controlled engines beginning in the late sixties were designed to run hotter because higher operating temperatures reduce emissions, and 200-230F (about 95-110C) is considered normal especially in warm/hot weather and stop and go driving.
Some owners get so concerned they shut down the AC, but the engine might actually run cooler in low speed traffic because AC cooling demand will cycle the electric fans at low speed, which also benefits engine cooling.
A 50/50 blend of ethylene glycol with a 15 psi pressure cap boils at about 265F (about 230C).
If it works don't fix it!
Duke