Audi TT - Page 117

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– Have the second mechanic (working from engine compart‐
ment) guide both flanges for coolant pipes to heater core -A-
and for expansion valve (to evaporator) -B- through pass-
throughs of grommet -C- when inserting heating & A/C unit.
Note
♦ When installing A/C/heater, make sure the two coolant pipes
of the heater core do not get caught and bent or damaged on
plenum chamber or noise insulation mat.
♦ Observe wiring harness, individual electrical wiring connec‐
tions may get damaged when pulling on harness.
– Connect condensation water drain to connection on A/C unit
and check condensation water drain for correct seating. Refer
to
⇒ “4.5 Condensation Water Drain Hose, Checking“, page 92 .
– Reinstall removed components in reverse order of removal
except driver's side storage compartment.
Note
♦ When installing the instrument panel, make sure that the de‐
frost intermediate piece its properly on A/C unit (heater) and
the defrost vent does not pinch the intermediate piece. Refer
to
⇒ “2.1 Air Routing and Distribution in Passenger Compart‐
ment“, page 44 .
♦ After installing instrument panel, check output direction and
distribution of air flow from defroster vent to windshield.
– Connect coolant hoses properly to heater core. Observe mark‐
ings:
A - Supply hose from cylinder head
B - Return to the coolant pump
– Connect refrigerant lines to expansion valve. Refer to
⇒ “5.18.13 Refrigerant Lines, Disconnecting and Connecting
From Expansion Valve“, page 180 .
– 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 .
– Check coolant circuit for leaks, pay particular attention to the
connection between coolant hoses and heater core. Refer to
⇒ “5.14 Heater Core“, page 144 and ⇒ Engine Mechanical;
Rep. Gr. 19 ; General Information .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
5. Removal and Installation 113