| Switching on auxiliary heating mode in vehicles with Climatronic: |
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| Press instant heating button -E537--1-. |
| Once the coolant temperature has reached 84° C, the auxiliary heater control unit switches to the energy-saving part load mode. If the coolant temperature continues to rise above 88 °C, the control unit switches to the controlled waiting period. If the coolant temperature does not drop below 70 ℃ within 900 seconds during the controlled waiting period, the heating unit will start with the normal start procedure in full-load mode when the coolant temperature does drop below 65 ℃. |
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