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| Unplug the connector -2-. |
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| Remove the dust and pollen filter → Chapter. |
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| Screw out the bolt -4-. |
WARNING The heat sink at the fresh air blower control unit -J126- may be hot. |
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| Press the fresh air blower control unit -J126--Item 3- inwards and take out -arrow- at the opening for the fresh air blower -1-. |
Install in reverse order, paying attention to the following: |
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| Tighten the bolt -4- to 1.5 Nm. |
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| Install the dust and pollen filter → Chapter. |
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| Check operation of the fresh air blower control unit -J126-. |
On completion of repair work, perform the following operations on the operating unit, Climatronic control unit -J255- in the
„Guided fault-finding“ function → Vehicle diagnostic tester: |
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| Interrogate the event recorder and delete any entries displayed. |
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| Perform final control diagnosis. |
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