Plenum Chamber Water Drain, Checking, Cleaning

Plenum Chamber Water Drain, Checking, Cleaning

• The draining of water from plenum chamber may be impaired by deposits (leaves, diverse tree needles etc.) accumulating in plenum chamber water drains. In the car wash or during heavy precipitation, the water level in the plenum chamber rises, and water flows via the fresh air intake - A - into the air intake unit - B -





• The water drain hose - C - should drain water that enters the air intake unit in small quantities during normal operation through the fresh air intake.

• The water drain hose - C - drains the water from the plenum chamber (via connector - D -) to the area behind the insulation mat in the center tunnel (there is a corresponding hole in the floor of the plenum chamber).

• A plastic piece - D - to reduce the diameter is insert in the water drain hose - C -. If the plastic piece - D - is not there, noise may result depending on the speed of the Fresh Air Blower (V2).

• Water drain grommet - C - can be accessed after removing the Alarm Horn (H12) of the anti-theft warning system - B -. Water drain grommet- D - cannot be accessed when the brake booster and air intake unit - A - are installed.





• If water drain grommets - C - and - D - 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 distance, heat from the engine and exhaust system thaw the ice in the drains. By the time the vehicle comes to you in the workshop, the water may have all drained out of the plenum chamber.

• Water drain grommet - C - can be cleaned e.g. after removing the Alarm Horn (H12) of the anti-theft warning system - B - (remove Alarm Horn (H12).

• Water drain grommet - D - can be cleaned e.g. of coarse dirt using a commercially available flexible gripping tool. Fine deposits and sludge can be removed e.g. using a thin water hose or Pressure-fed Spray Gun (V.A.G 1538) and a Nylon Probe (V.A.G 1538/2).

• If one of water drain grommets - C - or - D - is sealed close and there are e.g. leaves in the plenum chamber, clean the area under the air intake unit of coarse dirt using a commercially available flexible gripping tool. Fine deposits and sludge can be removed e.g. using a thin water hose or Pressure-fed Spray Gun (V.A.G 1538) and a Nylon Probe (V.A.G 1538/2).

• To ensure that water does not drain via water drain hose - E - into the air intake unit, the hose ends in the area behind the insulation mat in the center tunnel.