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– Make sure the grommet -C- fits correctly inside the bulkhead.
– Seal flange for coolant pipes to heater core -A- and for expan‐
sion valve (to evaporator) -B- at pass-through of grommet
-C- with silicon adhesive sealant if necessary (to prevent water
from penetrating).
– Connect coolant hoses properly to heater core. Observe mark‐
ings:
A - Supply hose from cylinder head
B - Return to the coolant pump
– Reinstall all components removed in reverse order, with the
exception of cover for connections on heater core and driver's
side storage compartment.
– Check installation position of coolant hoses to heater cores
(they must not contact components which grow hot) and po‐
sition and state of heat protection insulation applied to coolant
hoses if necessary (not installed on all engine types).
– Bleed cooling circuit. Refer to ⇒ Engine Mechanical; Rep. Gr.
19 ; General Information .
Note
♦
When bleeding coolant circuit, take special care to ensure
complete bleeding of heater cores. If there are still air bubbles
in the heater core, it may cause the customer to complain of
insufficient heating performance in winter or different air tem‐
perature from vents at same setting in regulated mode. Refer
to
⇒ “4.6 Heating Performance Of A/C System, Checking“, page
♦
Depending on vehicle equipment and on engine, heat insula‐
tion has been applied to coolant hoses, these must not be
damaged and must be re-applied after installing.
Check the cooling system for leaks
– Bleed coolant circuit.
– Carefully open coolant reservoir cap (observe safety cautions
when opening the cap). Refer to⇒ Engine Mechanical; Rep.
Gr. 19 ; General Information .
– Increase pressure in coolant circuit, for example, using a hand
pump -V.A.G 1274/- .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
150
Rep. Gr.87 - Air Conditioning