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E46 Climate Control
Ventilation Intervention (Center Vent Air Distribution)
The influence of the solar sensor on the ventilation flaps is shown in the graph below.
The normal curve “B” applies when there is no solar sensor influence 0%, or if the sensor
is defective.
The maximum curve “A” applies when the solar influence is 100%.
The ventilation flaps will close less as the solar influence increases. This allows more cool
air from the center vents as the solar radiation increases.
This adjustment is also independently adjustable on the E38 based on the left/right solar
sensor inputs.