Procedures

Plenum Chamber Water Drain, Checking And Cleaning

• The draining of water from plenum chamber may be impaired by deposits (leaves, diverse tree needles etc.) accumulating in plenum chamber water drains. The water level in the plenum chamber then rises if the vehicle is taken to an automatic car wash or in the event of heavy rain and water penetrates into fresh air intake housing via the water drain valve - arrow - installed in the fresh air intake housing, is drawn in from there through the fresh air blower along with the air conveyed and blown on to evaporator.






• Both water drain grommets - A - installed in plenum chamber can be cleaned from above (only with plenum chamber cover removed) or from below (with left or right wheel housing liner removed), depending on vehicle.






• Remove plenum chamber cover to clean plenum chamber, both water drain grommets - B - can be cleaned for example, with vehicle on a lift via both wheel housings from below with the wheel housing liner removed.

• If water drain grommets - B - are blocked by leaves and pine needles, it may cause the drains to freeze up in winter and water can no longer drain out. After a short drive, heat emitted from engine and exhaust system melts the ice in the drains again and water may drain off again before vehicle arrives at the workshop.

• Water drain grommets - B - are installed into body drain openings - A - from above, water drain grommets can be removed and installed also from below when the wheel housing liner has been removed






Checking and cleaning

- Remove the plenum chamber cover.

• Use a commercially available and illuminated endoscope for example, to check the water drains that are difficult to reach. It is best to use one that has a flexible waterproof head.

• Depending on the vehicle model, it may be necessary to loosen the engine control module from the bracket and set it aside in order to clean the right water drain.

• Use a commercially available flexible gripping tool to clean, for example, coarse dirt from difficult to reach water drains. Then wash out the any remaining contaminates.