Carsy

Today I pulled about a ton of gravel & sand in a trailer in hilly country with the ambient temperature at 36' C ( nearly 100' F).

I am amazed that the temp guage did not alter from the 92' C setpoint whether negotiating a hill or on the flat. This is my first MB & on all previous cars the temp guage varied depending on load , ambient temp, whether the A/C was operating,stopped in traffic ect.

All I can say is that the guage is fudged OR the fan & thermostat are very efficient in operation . The radiator must also have more spare capacity than other cars.

I welcome any comments.

TMAllison

On my E class the temp gauge has a designed dead spot between 95 and 105C. It will hold 95C until it reaches 105C and then jump and begin reporting the correct temp again. Is supposedly done to prevent unnecessary visits to the shop.

The CCU will digitally report the correct coolant temps if you want to view them next time. Press and hold Rest for 5 secs, use Auto buttons to scroll to screen 7(?).

Ausmbtech

It's value number 6, not 7.

They do move about a little bit on temperature, but they are more consistant than older generations as they have much more excess capacity from the cooling fan and radiator than previous models.

Carsy

Thank you TM Allison for the info. I think my 2008 C Class must be different to the E Class as I do not recognise the Rest & Auto buttons on the steering wheel.

Thank you also MB Tech for your help.

TMAllison

CCU=Climate Control Unit (AC/Heater)

Carsy

I have attached a photo of my Climate Control Panel .

I cannot see any Rest Button but one Auto button.

I appreciate your help. John

TMAllison

Yours is the next newer layout than mine. The command has prob moved ot another button. Give recirculate or defrost a try.