Plenum Chamber Water Drain

Plenum Chamber Water Drain

For vehicles without a high voltage system

- Turn off the ignition.

- Remove the plenum chamber cover and/or the cowl panel (there are different versions).

All vehicles

• The following illustrations show the location of the components on an Audi A5 Coupe; an Audi A5 Sportback, Audi A4, Audi Q5 etc., the location of the components varies slightly. The description of the components is not different; removing, installing and checking is performed in the same way as on the Audi A5 Coupe.

• The draining of water from plenum chamber may be impaired by deposits (leaves, diverse tree needles etc.) accumulating in plenum chamber water drains - A -. 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, water enters via intake housing into the A/C unit and is blown by the Fresh Air Blower (V2) onto the evaporator together with the air conveyed.






• If both water drain grommets - A - (right and left in plenum chamber) 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.

• The water drain grommets - A - are snapped into the plenum chamber openings from above.

• In addition to the two water drain grommets - A - there is an opening on the right side of the body - C - in which water can drain out behind the wheel housing in case both water drain grommets - A - should become obstructed. Likewise, make sure these openings are not obstructed by dirt.

Checking and cleaning

- Remove the plenum chamber cover, if necessary (there are different versions).

• 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.

• 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.

- Clean the left and right water drains - A -.

- Clean the plenum channel from debris (leaves, pine tree needles) and other objects.

- Check the function of the - A - grommets (the valves - B - must not stick or be obstructed with dirt)

Removing

- Remove the grommets - B - by pressing them from the top, out the water drain openings - A -.

Installing

- Install the grommets - A - by pressing them from the top, into the water drain openings.

- Check the function of the - A - grommets after installing them (the valves - B - must not stick and must close)