Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Overview - Display Control Head, CLIMATRONIC
An indicator lamp inside the controls indicates when the selected function is on. In addition to this, whenever a button or a control is selected, the function will briefly appear in the radio or radio/navigation system display.
To change from °C and °F in the radio or radio/navigation system display, go to the main menu in the instrument cluster. Call up the main menu with the rocker switch (or multifunction steering wheel) in the windshield wiper lever. The select settings, units and temperature.
If new Heater and A/C Controls -EX21- with Climatronic Control Module -J255- was installed, perform the Guided Fault Finding or Guided Functions , the basic setting and adaptation "A/C compressor first start".
If the lamp in the A/C button does not come on after the button is pushed, there may be a fault in the control module. Call up the DTC memory using the Vehicle Diagnostic Tester. If the DTC memory entry "A/C compressor first start not performed" is present, then is it necessary to perform a basic setting and an adaptation "A/C compressor first start" in Guided Fault Finding.
Pressing the button AUTO will reverse all settings which deviate from the automode.
If there are differences from automode, see the corresponding user guide.
When the OFF button is activated, the Climatronic is not operating. There is no heating or ventilation.
When the OFF button is deactivated, the Climatronic works.
The A/C button is pressed and the A/C compressor is on. The heating and ventilation continues to be controlled electronically.
If the A/C button is deactivated, the A/C compressor is set to almost 0 delivery. The heating and ventilation continues to be controlled electronically.
- Left Temperature Display
- Shows the set temperature for the driver side.
- Left Seat Heating Button -E653-
- Optional
- The seat heating has three settings. An LED indicates which setting is selected.
- If no LED is illuminated, the seat heating is switched off.
- Windshield Air Distribution Button
- The LED turns on when the setting is active.
- Center Air Distribution Button
- Air distribution to the upper body via the center vents
- The LED turns on when the setting is active.
- Lower Air Distribution Button
- Air distribution into the footwell.
- The LED turns on when the setting is active.
- Recirculation Mode Button
- The LED turns on when the setting is active.
- Manual and automatic recirculating air mode.
- Pressing the button will switch the system to recirculating air mode and polluted air is prevented from entering the vehicle interior.
Recirculating air mode is switched on automatically under the following conditions:
- When the operating the windshield washer system,
- When the Air Quality Sensor -G238- is activated.
- When the reverse gear is engaged (this function is only active for two minutes after the engine is started).
- Blower speed on the Heater and A/C Controls -EX21- off,
- Heater and A/C Controls -EX21- "OFF".
- Right Seat Heating Button -E654-
- Optional
- The seat heating has three settings. An LED indicates which setting is selected.
- If no LED is illuminated, the seat heating is switched off.
- Right Temperature Display
- Shows the set temperature for the front passenger side
- Max A/C
Button
- The LED turns on when the setting is active.
- Run the A/C system with the maximum cooling output.
- A/C
Button
- The LED turns on when the setting is active.
- The A/C compressor is set to almost 0 delivery when the A/C button is off. If the AUTO button is activated, the heating and ventilation mode continues to be controlled electronically.
- Right Temperature Control Knob
- The selected temperature will be shown in the display.
- Sync
Button
- The LED turns on when the setting is active.
- Synchronization of the climate zones to the driver value.
- Low Blower Speed
- Only for display, no function
- AUTO
Button
- The LED turns on when the setting is active.
- In automatic mode the Climatronic maintains the selected vehicle temperature automatically. The air temperature, the blower speed and the air distribution are adjusted automatically.
- Menu
Button
- Pressing the Menu button calls up the climate control menu for adjustment for example of the recirculating air mode and default functions.
- Blower Adjustment Knob
- By turning the knob, the blower speed can be individually adjusted.
- If the blower speed is manually adjusted, the AUTO function is automatically deactivated.
- High Blower Speed
- Only for display, no function
- Immediate Heating Button -- for Turning Parking/Auxiliary Heater On/Off, OFF
Button for Turning the A/C System On/Off, or the RESET
Button
- Depends on equipment
- When the OFF button is activated, the Climatronic is not operating. There is no heating or ventilation.
- MAX Defrost Button
- Air intake from the outside is directed to the windshield and the recirculating air mode will switch off automatically if it is switched on.
- In order to remove fog from the windshield quickly, the air temperature must be above 1.5 °C (35 °F). The A/C compressor is switched on and the blower is set to the highest blower speed.
- Rear Window Defogger Button
- The LED turns on when the setting is active.
- It only functions when the engine is running and switches off automatically after 10 minutes.
- Left Thermostat Adjustment Knob
- The selected temperature will be shown in the display.
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.