My new one is running about 78 degrees instead of the 82 I am accustomed to seeing. Is the standard stat from the factory an 82 degree stat?

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

AFAIK it's an 80C thermostat; my '95 E300 runs at about 90C on the gauge most of the time (but I don't necessarily trust it). The challenge lies in deciding which (a) thermostat, (b) temperature gauge sender, or (c) temperature gauge is correct. An IR thermometer is handy in measuring the temperature of the engine and radiator once it's up to whatever passes for "normal" in your or anyone else's engine.

Jeremy

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"Buster" in the '95

Our all-Diesel family
1996 E300D (W210) . .338,000 miles Wife's car
2005 E320 CDI . . 113,000 miles My car
Santa Rosa population 176,762 (2022)
Total. . . . . . . . . . . . 627,762
"Oh lord won't you buy me a Mercedes Benz."
-- Janis Joplin, October 1, 1970

The NA engine uses an 85 degree thermostat and keeps the needle at 90C, It will climb to 95 or 98 (a hair below 100) at a standstill for more than 5 minutes.

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2012 BMW X5 (Beef + Granite suspension model)

1995 E300D - The original humming machine (consumed by Flood 2017)
2000 E320 - The evolution (consumed by flood 2017)

So it must have the wrong stat.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.

Leave it alone Tom. If it keeps it at 95 and below year round you are good to go. You really have to load it up to bring the temp up. You won't get it up to a good operating temperature if all you do is a little round town driving. Around here loaded up is getting off the interstate (80 mph, min 20 mins) and immediately getting into bumper to bumper traffic with the a/c on during a hawt Ga summer.

I have two 95 E300's and one runs a little hotter than the other (maybe 5dF). One has 271k miles and the other has 317k miles. Both have had all new cooling system parts including radiator and the temps have remained the same (and same difference) through all the parts replacement. Head gasket has been replaced on both of them and I did not see any discernable differences in any of the parts. I don't run a shroud on either of them and I never see temps above 100dF although it looks like one of them may need a new fan clutch.

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Jim

Mine behaves just like Zulfi's car with a new thermostat. My old stat was in the process of failing to open and kept the car at about 80 all the time. I have the original radiator and original water pump, believe it or not!

Rgds,
Chris W.
'95 E300D 409K

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Objects in closer are mirror than they appear.

yesterday the car never came up to temp. Best was maybe 40C. I suspect the stat is stuck open.

This morning though at minus 6 F it started right up with no block heater.

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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.