Coolest running w123 I've ever owned. Why?
 

My 85 Euro wagon normally runs with an engine temp below 60. Hard driving it I t gets to 60 and really hard driving up the mountain doing 70 on a 100d day gets it to almost 80... Whereas every other w123 ran at 80 or higher normally. It's low enough in this car that I suspect the gauge being off. Could this be due to a lower temp thermostat in the car or? I ask cause I've always seen 80-85 being the optimal temp.

Ok - can't resist... Did Dr. Bert work on this car? (for those that haven't noticed look for his long thread where other members go crazy because he likes to run 60 degree thermostats - amusing reading.

Sounds like it could be a low temp thermostat, a stuck open thermostat, or maybe a temp gauge that's off. Hard to tell without further testing.

So, where in north Georgia are you? I'm near Gainesville.

If your temperature indication is accurate, the issue has to be with the themostat. Or lack thereof.

Probably no thermostat or broken thermostat. A 60c thermostat wouldn't cause it to run below 60c.

I had the same symptoms on mine when I swapped in a new engine and it turned out to be a "modified thermostat", courtesy of the PO



http://www.peachparts.com/shopforum/...hermostat3.jpg

I'm guessing something similar on yours.

Use an IFR Lazer thermometer and take temps of the head, Radiator etc... to see where the under hood temps are.

My guess is a Thermostat also. when we bought the 85 300D back in 97 I did`t know what the "C" reading on the temp gauge ment or where they were suppost to be. had it in a shop and they said they replaced the Stat because it was reading low.

The Stat they removed (refering to the above picture) had that cross piece broken off on one side, andlet the center part sort of cocked over and not seat.

Charlie

He he he he he he he he he he!!!!

The guys who claim a Benz will run hot without a thermostat will LOVE this thread!!!!!:D

My 240D had a stuck open thermostat. It would never get out of the basement on engine temperature last winter. 50 Deg c was a struggle.

Remember what is going on here. The radiator is designed to have more heat removal capability than the engine can produce. (Otherwise you will end up with a melted engine.)

In order for the engine to reach optimal operating temperature, the coolant in the block needs to circulate around the block without going into the radiator. This allows the engine heat to build the coolant temperature up to the 80 deg c region. Then the thermostat opens and allows the coolant to flow into the radiator. The system is now at equilibrium and the heat is removed and dissipated in the radiator.

If you did not have the thermostat closed at startup, the heat produced by the engine cannot overcome the thermal mass of the engine and the constant flow of cold water coming from the radiator.

If your thermostat did not open up once you are up to nominal temperature you would over heat.

Too cool is just as bad as too hot.

Chuckle
 

Makes me think of.
http://loyalkng.com/wp-content/uploa...mmet-Brown.jpg

I'll have to pull the therm and check it. I guess I should wait until I get the A/C working again and give it a nice hot day with the A/C on to see where it's at.

Why?

Ever see low piston temps score a skirt????

FYI
 

You have e-mail.


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