binone

I just noticed that the engine temperature gauge is suddenly showing a hotter temperature.

I now have about 3500KM on this car. I seem to recall that until recently I would have 4 white bars unlit before the red overheat light. Now it is pretty consistently sitting at 3 white bars unlit - so engine is consistently running one bar warmer. Maybe it is because outside temps are dropping and the engine is compensating - but just wondering where you see the temperature gauge "normally"?

Enjoy!

larrypmyers

My normal operating coolant temperature runs two segments past the 80 degree mark.

stath

Mine consistently is at 3 bars below the red temp bar. SO I think yours is normal. It seems to me that the GLC runs "hot". I often touch the engine and radiator after a trip, and always feels very hot. I cannot see the temp in digits on the GLC300W, only the bars on the instrument display.
I had the same with my BMW 540. It was hot to the touch after a trip, when touching the water coolant tank or the engine block.
In comparison, my RDX Acura was running "cold", always the temp needle below the middle, and engine/radiator felt "warm" to the touch.
I think it's not a good thing for the engine to get so hot. But that's how it was designed.

Sigp232

Mine is the same way stays 3 bars below the red temp. And yes even after a short trip hood gets hot when I touch it. Pop the hood open seems like Im baking bread in the oven under the hood everything hot to touch. Compared to my Toyota FJ engine stays cool inside and on top of hood.

Alex Fucheck

If you go into engine data under dynamic select under the vehicle settings tab, it will display current coolant temperature in Degrees Celsius. I will post some pictures after my ride home from work this morning. This screen will also display current battery output voltage as well as horsepower/torque readings whilst driving. Pretty neat feature to have if you ask me

Alex Fucheck

As promised some photos to accompany what I’m talking about. My engine typically operates at around 100 Degrees Celsius (212 Degrees Fahrenheit), the atmospheric boiling point of water which is obviously pretty hot but nothing I would be particularly concerned with, as this is typical for car engines. Another thing to note if you have the engine data display up while the car is getting up to temperature is that the bars displayed in the instrument cluster are quite inaccurate compared to the temperature given on the engine data display. Not really an issue, just something I thought I’d point out based on my observations. Hope this puts your mind at ease!

binone

Thanks for posting this Alex. Had no idea this info was available. This is very cool data to have access to.

Sigp232

Interesting I always thought that was the oil pressure reading.

Alex Fucheck

Sigp232 you are correct, that is the oil temperature reading in the engine data display, not the coolant temp. That was definitely my bad. I just finished working a 12 hour midnight shift so I can’t say that that detail was not overlooked. With that being said however, the relationship between that of the coolant temperature and oil temperature is a directly proportional, linear relationship so the statements I had made in my previous posts still hold true. I’m glad I could help.

stath

These screens must be from an AMG or maybe some advanced package. Because I don't have temp data nor any other Engine data under Dynamic Select in my P-01 GLC300.

Sigp232

Mine is a 2017 GLC 300 4matic with P-03 maybe it’s not included with P-01.

Alex Fucheck

Stath, here is a link to my decoded vin. It’s a 2016 GLC300 4-matic that was delivered in April of 2016

Mercedes-Benz datacard

taphil

My GLC43 shows engine oil (and transmission oil?) temps.

hifivoice

I believe you need the COMAND system to be able to see those readings.

Jetfuture

One can always install a bluetooth OBD-II sensor, download a free app, and monitor all sorts of things. I've done this to read the actual coolant temperature down to the degree. The bluetooth sensors are very inexpensive and can also read Diagnostic Trouble Codes, although not to the detail that a Mercedes Dealer's equipment would do.

dizneyman

its not under dynamic select, move over to one side until you see engine data.

Jetfuture

During drive today in 55F outside temperatures, the oil temperature and coolant temperature both peaked at 95C (203F). Interesting that it took nearly 15 minutes of driving until the oil temperature got up to that operating temperature. Definitely runs warmer than my Hondas, which tend to have the coolant run at 180F on my Pilot and up to 190F on my Civic. (not sure about the oil temp).

So, what I learned from watching the temps closely today is definitely not to do any "sport" driving for the first 15 minutes because it takes the oil about that long to get up to operating temperature.

Mr. J

ECU will limit rpms to protect the engine. Regardless, I usually just run in comfort mode until the engine oil is up to nominal temp.

Jetfuture

Thanks. Man, those Germans think of everything!

ecmexchange

At least you are being careful. I see way too many people that expect full operation from their cars without letting the oil get up to temp.

akashsaroya24

varuns

I recently took my car for service. They installed an adapter which is connected to my phone.

The coolant temperature for the first few days would go to a max of 91 and would come back to be around 88. The engine temperature would almost be the same.

last few days the coolant went up to 95 before it came back and engine temperature went up to 97 before it came back.

I don’t get any suitable answer from the company as to why the change in temperatures. I am worried if there is something wrong with my car.

it’s a 2016 model but driven only 20k kilometers. Very lovingly. And it’s fresh out of service.

any suggestions?

DanD.

I have 18 GLC 300 4Matic and temp stays three bars before the hot, its been this way from day one.

MB design this engine to run hot as it can burn more and meet eco norms. Will it impact longevity is another question, looks like nobody is asking how much CO2 will be produced in process of building and recycling new engine as this one wont last long. Totally different subject.