Audi Q7 2007 Repair Manual page 71

Note
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- in‐
stalled 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,
♦
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
both water drain grommets -B- can be cleaned e.g. with vehi‐
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
cle on a lift via both wheel housings from below with the wheel
with respect to the correctness of information in this document. Copyright by AUDI AG.
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 open‐
♦
ings -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. Refer to ⇒ Body Exterior;
Rep. Gr. 50 ; Body Front; Plenum Chamber Bulkhead, Re‐
moving and Installing or ⇒ Electrical Equipment; Rep. Gr. 92 ;
Windshield Wiper Arms System .
Note
To check the water drains that are difficult to reach, use for
♦
example a commercially available and illuminated endoscope.
It is best to use one that has a flexible waterproof head.
Depending on the vehicle model, it may be necessary to loos‐
♦
en the engine control module from the bracket and set it aside
in order to clean the right water drain. Refer to ⇒ Fuel Injection
and Glow Plug; Rep. Gr. 23 ; Engine Control Module; Engine
Control Module - J623- , Removing and Installing or ⇒ Fuel
Injection and Ignition; Rep. Gr. 24 ; Fuel Injection System,
Servicing; Engine Control Module - J623- , Removing and In‐
stalling .
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.
Heating, Ventilation and Air Conditioning - Edition 04.2013
5. A/C System Control and Regulation Components Outside Passenger Compartment
Audi Q7 2007 ➤
65