ahesq

Anyone know why the temp gauge below the tach no longer has any numbers?

My 2018 C63S Coupe only has "C" ------------"H"

Looks a little cheap in my opinion

Were 2017's like this?

ItalianJoe1

All 205s are like this. Electronic variable thermostats kinda make the old number displays obsolete, as the number target changes depending on operating conditions. It would just make more customers come in thinking the car was too hot/cold.

ahesq

Hmmm

If you google C63S temp gauge, you will see photos of the same car with the prior temp gauge 40------80-------120

Just wondering when it changed to "C---------H"

msd3075

My 2015 C63S sedan has the "40---80---120" markings on the gauge.

tekfoc

I have it on my 16

ahesq

It appears that all US bound 2018's now come with "C-------H" temp gauge now, but Canada 2018's still get the old numeric gauge.

Can't see why, since all US 2018 base C class cars still come with the numeric gauge

infra

The numbers on the gauge are meaningless anyhow, as the gauge does not actually tell you temperature. It tells you if the temperature is within the correct *range*. Automakers stopped making these gauges report instantaneous temperature a long time ago as customers would complain if the gauge wasn't perfectly in the middle... so now it always sits perfectly in the middle unless something is wrong.

ItalianJoe1

Not true at benz, the gauges still display the accurate temperatures. Normal is usually over half on the benz products.

infra

No, that's wrong. The gauge is dampened. Do you ever see it move when you do a full throttle run on a 100 degree day?

ahesq

On my 2018, the level is about 2/3 towards H when warmed up, all the time. That is the exactly the same as the last seven US Mercedes I have had with the numeric temp gauge.

So, the numbers may be meaningless but it doesn't explain why they decided in 2018 to completely eliminate the numbers for 2018 only on AMG products for all US bound cars.
As advised, all other Mercedes 2018 US bound products still have the numeric gauge .

There certainly must be some reason for this.

ItalianJoe1

Have you watched the actual values during the run to know that the sensor is seeing higher temps than what the gauge is displaying? I have. It follows very closely.

infra

I'm glad you agree the gauge is dampened. Of course the sensor sees the real temperatures. Which are processed by a computer for display in an electronic gauge.

ItalianJoe1

No, i'm saying, have you watched the actual value versus the gauge? They aren't very different, if at all.

msd3075

Unless you somehow have a separate thermometer down there measuring the temps, you are getting a dampened reading. All temp gauges on the car that you can look at (coolant, oil, transmission) are dampened. They purposely design each gauge that way because 99.9% of drivers would freak out the first time they saw the fluctuation of the actual real-time temps for each.

ItalianJoe1

What?

If you watch the sensor reading that it feeds to the m/e, and it's the same as what's on the dash within a few degrees, how is it damped?

I know what you're saying, BMW has done this for years, the gauge had absolutely no relevance to actual engine temps. I'm a benz tech, i'm telling you, it's not the same at benz.

Passat774

I watch the actual digital temperature in AMG display mode. It displays both the engine and transmission. It also changes from Blue to White once the car warms up.

Anyone else?

RDOCA

Of course you are talking about OIL temp --both engine and trans but the other gauge is WATER temp.

msd3075

Any measuring device, just simply by it's design and how it functions, will always have a delay and/or 'dampening' affect to it. Anyone who has ever taken their temperature when they're sick understands it takes time for the thermometer in your mouth to reach your temperature; it doesn't happen instantly.

I'm assuming the sensors in our cars are some sort of thermocouple. With each thermocouple, the metals within have to react to the temperature change in order the show that as a change in voltage. That voltage change is then interpreted by another device as a change in temperature. You have two different "dampening" events going on. The first is how quickly the thermocouple reacts and shows a change in voltage, and the second is how quickly the measuring device (computer, multimeter, your eyeballs, etc.) picks up on the change and represents on it's display a change in temperature. Everyone here is talking about the second part of this, and what I said in an earlier post was about the first part.

ItalianJoe1

I know all this, i'm trying to figure out how it related to the conversation we were having.

When I say "actual value", i'm not talking about some theoretical temp that the sensor hasn't seen yet due to the nature of heat transfer. I'm talking about the value present in the computer from the actual sensor. This matches what's displayed on the gauge, despite what the earlier replies were trying to insinuate. That's all there is to it.

msd3075

Maybe I took what you said in a bit of a different direction because I took "actual temperature" to mean the actual temperature of the fluid. Oh well, all this is a good read for anyone wanting to know more about the subject.