A8L V8-4.2L (BFM) (2004)
Cabin Ventilation Duct: Testing and Inspection
Vent Frame, Checking
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Check air ducts to both vent frames -A- in luggage compartment for blockage (left and right).
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Sealing lips -B- in vent frame -A- must move freely and close automatically
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Clogged ducts or gummed sealing lips can cause windows to mist up
NOTE:
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Fig. shows vent frame with rear bumper removed.
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One vent frame is installed on left and right for forced air extraction.
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Sealing lips -B- only close properly if vent frame -A- has been installed correctly (smaller radius -C- at top).
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To ensure proper functioning of passenger compartment ventilation, vent openings -C- in left and right luggage compartment lining are never to be
sealed off.
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Air from passenger compartment flows via vent slots in rear shelf and through slots in upper lining -B- into luggage compartment.