Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
Note
Disconnect battery before starting electric welding work on vehi‐
cle. Refer to⇒ Electrical Equipment; Rep. Gr. 27 ; Removal and
Installation
The A/C refrigerant system may be drained and opened only if it
is for safety reasons. Refer to
⇒ “1.5 A/C and Refrigerant Safety Precautions“, page 29 or if
components of the A/C refrigerant system must be replaced. Re‐
fer to ⇒ “1.17 Refrigerant Circuit, Draining“, page 36 .
When performing all other usual vehicle repair work, the refriger‐
ant circuit of the A/C system should remain closed.
Servicing operations that can be performed on the heating and
air conditioning system without opening the refrigerant circuit are
described in this Repair Manual. Refer to
⇒ “1.2 A/C System Control and Regulation Components Outside
Passenger Compartment“, page 25 .
Note
The connections for the senders/switches described in this Work‐
shop Manual are fitted with a valve which closes automatically
when the switches are unscrewed. These switches can thus be
replaced in any Audi and Volkswagen workshop even though the
refrigerant circuit is fully charged.
Service work on the A/C system that require the refrigerant circuit
to be discharged and thus cannot be performed in every Audi and
VW workshop are described in
⇒ “2.3 Refrigerant Circuit Components Overview“, page 49 .
Certain tools are required to discharge the refrigerant circuit,
these work procedures must only be performed by trained per‐
sonnel as well. Therefore, bring vehicle to a workshop that has
the necessary tools and in which the work can be performed ac‐
cordingly by qualified personnel if necessary. Refer to ⇒ Refrig‐
erant R134a Servicing; Rep. Gr. 00 ; General Information .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
1. General Information 39
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