Control Assembly: Description and Operation

A/C Control Head -E87-, Functions







CAUTION: Before beginning repairs on the electrical system:
- Obtain the anti-theft radio security code.
- Switch off all electrical consumers.
- Switch ignition off and remove ignition key.
- Disconnect negative (-) battery terminal.
- When disconnecting and reconnecting battery terminals, observe all applicable Notes and torque specifications, as well as instructions on performing OBD program and electrical system function checks.

1. Windshield defrost button
2. Blower speed display
- In automatic operation -8- a mid-range is displayed independent of actual blower speed.
3. Ambient (outside) temperature display
- Display will not change when road speed is below 15 km/h (9.5 mph) and coolant temperature is above 70 degrees C (158 degrees F). Under these conditions, the actual measured value is not displayed because engine heat will adversely affect reading.
4. Windshield defrost display
5. Air recirculation display
6. Air distribution display
- Function: "air flow to footwell" is selected and indicated when pressing button -14-
- Function: "air flow to upper body" is selected and indicated when pressing button -15-
7. Selected temperature display
- To change display from Celsius to Fahrenheit and vice versa:
- Press and hold button -11- and press button -9-.
- Temp. scale appears in display.
8. Operating mode display

"AUTO": Automatic mode
- In automatic mode, the Climatronic maintains the selected interior temperature automatically. With this setting, the air outlet temperature, blower speed and air distribution are controlled automatically.

"ECON": A/C system off
- In ECON mode only the compressor is switched off. Heating and A/C operation continues to be controlled automatically.

"OFF": Complete system is switched off
- Select by pressing and holding "decrease blower speed" button -17- until "OFF" appears in display.
- In this mode, all air flaps remain in the last set position before switching off. (Setting should only be used in the case of a malfunction).

9. Automatic operation button
10. Instrument panel interior temperature sensor -G56- and interior temperature sensor fan -V42-
- Installation location on right-hand drive vehicles.
11. "ECON" button
- In ECON mode only the compressor is switched off. Heating and A/C operation continues to be controlled automatically.
12. "Warmer" button
13. "Cooler" button
14. "Air flow to footwell" button
15. "Air flow to upper body" button
16. "Increase blower speed" button
17. "Decrease blower speed" button
- To switch off A/C system, press and hold button until "OFF" appears in display.
- In this mode, all air flaps remain in the last set position before switching off. (Setting should only be used in the case of a malfunction).
18. Recirculating air button
19. Instrument panel interior temperature sensor -G56- and interior temperature sensor fan -V42-
- Installation location on left-hand drive vehicles.