Checking and Cleaning Plenum Chamber Water Drain

Checking and Cleaning Plenum Chamber Water Drain

• The draining of water from plenum chamber may be impaired by deposits leaves, diverse tree needles etc. accumulating in plenum chamber water drains. When in an automatic car wash or during heavy rainfall, water level will rise in plenum chamber and water will ingress into air conditioner through openings - A - right and left next to fresh air blower which are actually intended for water drainage, and will be blown through fresh air blower onto evaporator together with air conveyed.





• The two water drain sockets - A - and - B - in plenum chamber can only be replaced when removing transmission or air conditioner.





• Without removing air conditioner, transmission, pump valve unit and brake booster, drains and area beneath air conditioner can be cleaned from coarse dirt with a commercially available flexible grip tool. Fine deposits and sludge can be removed using a thin water hose or Pressure-Fed Spray Gun (V.A.G 1538) and Flexible Nylon Probe (V.A.G 1538/2). Removal of stubborn dirt can be facilitated by removing pump valve unit.

• If water drain sockets - A - and - 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.

• Metal clips are inserted from above into both water drain grommets - A - and - B -. These tabs hold the grommets in place in the opening on the bottom of the plenum chamber.