
•Once you have set the hour, wait until the minutes display in the instrument cluster is marked.
•Then press the  button repeatedly until the required minute is displayed. Press and hold 
the  button to scroll through quickly.
•Release the  button to finish setting the clock.
The analogue clock adjusts itself a few seconds after ignition is switched on.
You can also use the Infotainment system to adjust the time ⇒ Vehicle settings menu.
Fuel gauge
Fig. 20 In the instrument cluster: fuel gauge for petrol and diesel.
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Fuel gauge
Lit upPossible cause/remedy ⇒
Fuel tank almost empty. Reserve volume, red marking ⇒ Fig. 20, is 
consumed ⇒ Fuel tank capacity.
Fill the tank as soon as possible ⇒ Fuel types and refuelling.
Water in fuel in vehicles with a diesel engine.
Reduce the vehicle speed immediately and drive to the nearest qualified 
workshop at a medium engine speed and avoiding high engine loading.
OR: if the warning lamp lights up immediately after filling the tank, switch off 
the engine and seek expert assistance.
When the indicator lamp  lights up, the auxiliary heater and the fuel-powered supplementary 
heater switch off automatically ⇒ Auxiliary heater and ventilation.
The small arrow next to the petrol pump symbol in the fuel gauge shows you the side of the 
vehicle on which the tank flap is located.
Coolant temperature display
Fig. 21 In the instrument cluster: coolant temperature display (illustrationyf .
Driving when the fuel level is too low can lead to the vehicle coming to a standstill in 
traffic, potentially causing accidents and serious injuries.
•When the fuel level is too low, the fuel supply to the engine could be irregular, 
especially when driving up or down hills and inclines.
•The steering, all driver assist systems and brake support systems will not function if 
the engine sputters or stops completely due to a lack of fuel or irregular fuel supply.
•Always fill the tank when it is still 1/4 full. This reduces the risk of running out of fuel 
and breaking down.
WARNING
Do not run the tank empty. Irregular filling periods can cause backfiring and allow unburnt 
fuel to enter the exhaust system. The catalytic converter or diesel particulate filter could be 
damaged as a result!
NOTICE 

The auxiliary heater runs on for a short time after it is switched off manually or automatically so that 
the remaining fuel in the system can be burnt off.
When the vehicle is at a standstill, the auxiliary heater can be activated up to three times in 
succession for the maximum operating duration.
Operating noises can be heard if the auxiliary heater is switched on.
The 12-volt battery will discharge if the auxiliary heater or ventilation is run several times 
over an extended period. Drive the vehicle for an appropriate distance in order to recharge the 12-
volt vehicle battery.
When parked on an incline, the fuel gauge indication (just above the reserve quantityyf  P D \  
be inaccurate and lead to functional restrictions of the auxiliary heater.
The auxiliary heater may switch on automatically as a supplementary heating measure when 
the engine is started at temperatures below +5°C (+41°Fyf   7 K H  V X S S O H P H Q W D U \  K H D W L Q J  I X Q F W L R Q  L V  
switched off again automatically after a short time.
Programming the auxiliary heater and auxiliary ventilation
First read and observe the introductoryinformation and safety warnings⇒
Introduction
Opening the Auxiliary heater menu
The auxiliary heater is programmed in the Infotainment system.
m/k/a997MK Manual air conditioning system
•Press the  button on the Infotainment system.
•Touch the Vehicle and  function buttons.
m/k/a997MK Climatronic
•Press the  button on the control panel.
•Touch the  function button.
Changing the operating mode
•Open the Auxiliary heater menu.
•Touch the Heating or Ventilation function buttons to change the operating mode.
At high outside temperatures, the auxiliary ventilation function supplies fresh air to the vehicle 
interior and helps prevent a build-up of heat.
Programming the auxiliary heater
Activation is always for one heating or ventilation period only. The departure time must be activated 
for every start.
•Before programming, check that the date and time set in the vehicle are correct ⇒ Vehicle 
settings menu.
•Open the Auxiliary heater menu.
•Press the Adjust button.
•Choose one of the memory locations for a Departure time.
•Touch the Activate function button.
m/k/a995MKManual air conditioning system: the programmed departure time determines 
the time at which the auxiliary heater or ventilation should switch off. The point at which the heating 
or ventilation process starts is determined depending on the programmed operating period.
m/k/a995MK Climatronic: on the basis of the programmed departure time, the vehicle 
automatically calculates the start time for heating or ventilation to the currently set temperature 
depending on the outside temperature.
•Touch the Running time function button under Adjust to set the auxiliary heater 
running time after the heater is switched on with the immediate heat button  or using the 
remote control.