Audi TT - Plenum Chamber Water Drain, Checking and Cleaning

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4.10 Plenum Chamber Water Drain, Check‐
ing and Cleaning
Preparation
– Remove wiper arms. Refer to⇒ Electrical System; Rep. Gr.
92 ; Removal and Installation .
– Remove the rubber seal -1- and remove plenum chamber
cover -2- by carefully pulling it off retainers on windshield. Re‐
fer to⇒ Body Exterior; Rep. Gr. 50 ; Removal and Installation .
Checking
Note
♦ 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 auto‐
matic 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 con‐
veyed.
♦ If both water grommets -B- in water drains -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 -B- are attached from the top into
the openings in the mounts close to the suspension strut tow‐
er.
Cleaning
– Perform the preliminary work.
– Clean deposits (leaves, pine needles) and other contaminants
from left and right water drains -A- and plenum chamber.
Removing
– Perform the preliminary work.
– Remove the grommets -B- from the openings for the water
drain opening -A- in the mount.
Installing
– Install the grommets -B- from above into water drain openings
-A- in the mount.
– Check the grommets -B- after installing to make sure they
function correctly.
– Install all removed components again in reverse order.
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
100 Rep. Gr.87 - Air Conditioning