R8 Quattro Coupe V10-5.2L (BUJ) (2010)
‹› Closed or blocked air ducts to the vent frames can cause the windows to fog up.
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Remove the rear shelf,.
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Check the air ducts - arrow - to the ventilation frames in the left and sill panels for flow.
Check Forced Air Extraction Vent Frames From the Outside:
‹› Stuck sealing lips - B - can cause windows to fog.
‹› The sealing lips - B - in the ventilation frames - A - must move freely and close by themselves.
‹› Closed or plugged air ducts to the vent frames - A - can cause windows to fog.
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Remove the sill panel trim.
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Check the left and right vent frames - A - for flow and the sealing lip - B - for function.