Audi TT - Page 113

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Note
♦ Obtain radio code if necessary before disconnecting battery.
♦ On vehicles with seats that can be adjusted electrically, move
them all the way back before disconnecting the battery. Refer
to ⇒ Body Interior; Rep. Gr. 72 ; Removal and Installation .
♦ On removal, note down bolt lengths and assignment for in‐
stallation later.
♦ All cable ties opened or cut during removal of A/C (heater)
must be reinstalled at the same locations during installation.
♦ Depending on vehicle equipment and on engine, heat insula‐
tion has been applied to coolant hoses and refrigerant lines,
these must not be damaged and must be re-applied after in‐
stalling.
– Release pressure in cooling circuit by opening the cap on
coolant expansion tank. Refer to⇒ Engine Mechanical; Rep.
Gr. 19 ; General Information .
– Remove components that hinder access to mounting points
-A- on heat shield -B- and to coolant hoses to heater core in
engine compartment. Refer to
⇒ “5.18.13 Refrigerant Lines, Disconnecting and Connecting
From Expansion Valve“, page 180 .
– Loosen heat shield -B- from plenum chamber bulkhead (lay it
aside or remove it completely).
– Mark arrangement of coolant hoses -A- and -B-.
Note
♦ The heater core is designed for a specific coolant flow direc‐
tion. Therefore, coolant hoses must be connected on the
correct sides.
♦ Bleed the coolant circuit. Refer to ⇒ Engine Mechanical; Rep.
Gr. 19 ; General Information .
– Slide back thermal protective covers -D- and -E- far enough
that -VAS 3093- -F- can be installed on the coolant hoses
-A- and -B-.
– Clamp off coolant hoses -A- and -B-.
– Clamp off the ventilation hose -C- (to coolant expansion tank),
with a -3094- -G-.
– Cover the area beneath connections for coolant hoses -A- and
-B-, for example, with a paper towel.
– Remove coolant hoses -A- and -B- from connections to A/C
unit heater core. Refer to ⇒ Engine, Mechanical; Rep. Gr. 19 ;
Removal and Installation .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
5. Removal and Installation 109