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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
♦
Refrigerant in refrigerant circuit is never to be topped up (drain,
evacuate and refill circuit). Refer to⇒ Refrigerant R134a Serv‐
icing; Rep. Gr. 00 ; Description and Operation .
♦
Compressor is always driven when engine is running; there is
no magnetic clutch. Engine is not to be started unless refrig‐
erant circuit has been properly assembled. For example; if the
refrigerant lines are not connected to A/C compressor, when
the engine is running the A/C compressor may heat up (via
internal heat generation) so much that the A/C compressor will
be damaged. Such internal heat generation results from the
fact that, even with delivery near 0%, the compressor is con‐
fronted with a fixed resistance (sealed circuit).
♦
To stop the A/C compressor from destroyed when the refrig‐
erant circuit is empty, it is designed such that delivery is
reduced to roughly 0% and lubrication is maintained by way of
an internal oil circuit with the oil left in the A/C compressor.
♦
The entire amount of refrigerant oil to be added to the refrig‐
erant circuit is in the replacement compressor. Refer to⇒
Refrigerant R134a Servicing; Rep. Gr. 00 ; Specifications .
♦
Different refrigerant oils are required for compressors made
by Denso, Sanden and Zexel. Refer to⇒ Refrigerant R134a
Servicing; Rep. Gr. 00 ; Specifications .
♦
Beginning the production year 2006, the name of the “Zexel“
A/C compressor was changed from “Zexel“ to “Valeo“.
♦
Coat the O-ring seals lightly with refrigerant oil prior to instal‐
lation. Refer to
⇒ “1.21 Refrigerant Circuit O-rings“, page 41 .
♦
The specified diameters for O-rings and the tightening torque
pertain also to the threaded connections of the refrigerant lines
or refrigerant hoses between the separate components.
♦
Only install O-rings that have been approved to be used with
refrigerant R134a. Refer to
⇒ “1.21 Refrigerant Circuit O-rings“, page 41 , ⇒ Refrigerant
R134a Servicing; Rep. Gr. 00 ; Description and Operation and
to the Electronic Parts Catalog (ETKA).
♦
Check cooling performance; refer to
⇒ “4.2 A/C Unit, Checking Cooling Output“, page 79 .
♦
Check pressures in refrigerant circuit. Refer to ⇒ Refrigerant
R134a Servicing; Rep. Gr. 00 ; Diagnosis and Testing .
♦
All refrigerant circuit servicing and test procedures not descri‐
bed in this repair manual are covered in ⇒ Refrigerant R134a
Servicing; Rep. Gr. 00 ; General Information .
♦ Appropriate current flow diagrams can be found in Current
Flow Diagrams, Electrical Fault Finding and Fitting Locations
binder. Refer to⇒ Wiring diagrams, Troubleshooting & Com‐
ponent locations.
♦ A data plate in engine compartment indicates the refrigerant
used and capacity.
♦ Additional information for repairs on vehicles with an A/C sys‐
tem and for handling refrigerant can be found in ⇒ Refrigerant
R134a Servicing; Rep. Gr. 00 ; General Information .
♦ Contact corrosion. Refer to
⇒ “1.10 Contact Corrosion“, page 33 .
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
40 Rep. Gr.87 - Air Conditioning
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