What temperature does your W204 run at? What is normal running temperature?
MBWorld Fanatic!
Joined: Mar 2007
Posts: 2,408
Likes: 3
Out Of Control!!
Joined: Sep 2005
Posts: 18,414
Likes: 6
From: West Michigan
2007 E63
MBWorld Fanatic!
Joined: Dec 2007
Posts: 2,052
Likes: 1
From: Vancouver, BC
2008 Mercedes C300 4Matic
mines in the low 90's, i would guess under 80 means something's wrong, but you should ask a mb technician just to be sure so you get an official answer on the corrrect temp.
MBWorld Fanatic!
Joined: Nov 2007
Posts: 2,078
Likes: 4
From: NYC
2012 C300 4Matic
Yes running too cold can be a bad thing. The engine is supposed to get up to a specific operating temperature in order to burn fuel / run most efficiently. Not to mention for the heater to work optimally. Running too cool can put excess wear on your engine and cost you MPG. The guy who posted (I'm paraphrasing) that 'if you want to keep the car for a while it should be running cooler' couldn't have been more wrong. 
The proper temp is just a bit above the center on the gauge just like everyone here is saying. I don't understand why there are so many questions and so many people saying otherwise.
It's a fact: The normal operating temp for these cars is ABOVE THE CENTER LINE. If your car runs a little cooler I really don't see any problem with that. If it runs a lot cooler than yes you should have the thermostat and temperature sensors checked out.
The proper temp is just a bit above the center on the gauge just like everyone here is saying. I don't understand why there are so many questions and so many people saying otherwise.
It's a fact: The normal operating temp for these cars is ABOVE THE CENTER LINE. If your car runs a little cooler I really don't see any problem with that. If it runs a lot cooler than yes you should have the thermostat and temperature sensors checked out.
Newbie
Joined: Aug 2014
Posts: 1
Likes: 0
w204
Member
Joined: Jul 2014
Posts: 246
Likes: 0
From: Canberra, Australia
W204 MY10 C200CGI
Qualified MB tech weighing in:
90c is normal operating temperature for for these vehicles.
If you are running cooler it's either a jammed open thermostat, dodgy sensor or a faulty control unit (very unlikely).
If you are running hot, by which I mean consistently closer to 100, you should take it in to get checked out
90c is normal operating temperature for for these vehicles.
If you are running cooler it's either a jammed open thermostat, dodgy sensor or a faulty control unit (very unlikely).
If you are running hot, by which I mean consistently closer to 100, you should take it in to get checked out
Newbie
Joined: Jun 2014
Posts: 6
Likes: 0
C220 CDI W204
on my c220 in winter temperature never go above 60c. but in summer temperature is normal (under 90c) but on highway is going down to 70c. does I have problem with temperature sensor ? or is something else ?
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Nov 2015
Posts: 1,282
Likes: 57
2013 C250 Sport
Actual coolant temps vary considerably compared to the gauge. I've seen logging data vary over 10 degrees during operation while the gauge stays put. The data will show typically from the lower 80s to the lower 90s. There must be some sort of algorithm they use.
Junior Member
Joined: Feb 2011
Posts: 22
Likes: 0
From: Southern Maine
2008 C300 Sport 6spd man.
Plus one for us. 2008 C300 Sport. Has run about 90C always. The temp gauge calibration on this car is a bit wierd - doesn't seem really linear. Makes you stop and study it to figure out the temp. If I were designing the car, "normal" operating temp would be exactly mid-range (horizontal).
Super Member
Joined: Oct 2014
Posts: 701
Likes: 103
From: Ontario, Canada
2009 C63 AMG, 2010 C250 4Matic Sport
Yeah I think there is an "averaging" algorithm in use. If you take the actual OBD rating it usually bounces between 80 and I believe 95C which is the temperature at which the thermostat opens up. I've seen it very briefly spike to 100C a few times but the dash is always reading just about the same value.
Super Member
Joined: Jan 2009
Posts: 929
Likes: 51
From: Silicon Valley, California
Factory ordered 2012 MB C350 w/Dynamic Handling Package
A thread back in 2014 asking the same thing...
https://mbworld.org/forums/c-class-w...ure-gauge.html
...answered with the same questions on this thread.
https://mbworld.org/forums/c-class-w...ure-gauge.html
...answered with the same questions on this thread.
