Audi Q7 2007 Repair Manual page 60

Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
If the vehicle has the "Basis" A/C
♦
system without a Refrigerant
Temperature Sensor - G454- ,
and the sensor -G454- is being
displayed as a fault, then per‐
form an adaptation to the "Basis"
front A/C control head. It is not
necessary to perform this on the
"Comfort" A/C system because it
has different versions of the front
A/C control head. On vehicles wit
the "Basis" A/C system, "Guided
Fault Finding" displays the fault
missing Refrigerant Tempera‐
ture Sensor - G454- and the
evaluating of the refrigerant tem‐
perature sensor -G454- switches
off (by entering "adaptation").
Use the Vehicle Diagnostic Test‐
er via the "Guided Fault Finding"
function.
20 - A/C Compressor Regulator Valve - N280-
❑ Check activation and function. Refer to
⇒ "3.8 A/C Compressor Regulator Valve N280 , Checking Activation Signal", page 30
21 - Compressor
❑ For removing the A/C compressor from the bracket and installing it again (vehicles with a 6-cylinder
engine), refer to
❑ Ribbed belt, removing and installing: Refer to ⇒ Engine Mechanical; Rep. Gr. 13 ; Cylinder Block, Belt
Pulley Side .
❑ Replace the belt pulley. Refer to
❑ For removing the A/C compressor from the bracket and installing it again (on vehicles with an 8-cylinder
FSI engine), refer to
⇒ "16.4 Compressor, Removing and Installing (Vehicles with 8-Cylinder FSI Engine)", page 283
❑ On an 8-cylinder vehicle, it is necessary to evacuate the refrigerant circuit in order to remove the A/C
compressor from the bracket. Refer to
⇒ "16.4 Compressor, Removing and Installing (Vehicles with 8-Cylinder FSI Engine)", page 283
Compressor, 8-Cylinder FSI and 8-Cylinder TDI, Removing and Installing).
❑ On a 12-cylinder vehicle, it is necessary to evacuate the refrigerant circuit in order to remove the A/C
compressor from the bracket. Refer to
⇒ "16.3 Compressor, Removing and Installing (Vehicles with 12-Cylinder TDI Engine)", page 280
Compressor, 12-Cylinder TDI, Removing and Installing).
❑ For removing and installing the compressor drive unit (vehicles with an 8-cylinder FSI engine), refer to
⇒ "16.5 Compressor Drive Unit, Checking and Replacing (Vehicles with 8-Cylinder FSI Engine)",
page 290 .
❑ When installing refrigerant lines/hoses and pertaining bracket, make sure there is a sufficient gap be‐
tween belt, bracket and belt pulley
❑ Refrigerant line, disconnecting from compressor and connecting. Refer to
⇒ "15.3 Refrigerant Lines, Disconnecting from Compressor and Connecting", page 250
❑ Compressor, removing and installing. Refer to
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
⇒ "15.4 Compressor, Removing and Installing", page 252
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
❑ Depending on time period of production and on engine, compressor construction type may vary. Refer
with respect to the correctness of information in this document. Copyright by AUDI AG.
to the Parts Catalog.
❑ At the start of production compressors manufactured by "Denso" are installed. Refer to the Parts Catalog
and ⇒ Refrigerant R134a Servicing; Rep. Gr. 87 ; A/C System General Information (Refrigerant R134a,
Servicing; Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oil).
❑ These compressors are available as replacement parts with differing oil fill capacities, therefore note the
oil quantity in the compressor and the exact part number (refer to the Parts Catalog). The reason for the
different oil quantities in the compressor with an otherwise identical refrigerant circuit lies within the
design of the compressor itself, note these oil capacities. Too much oil in the circuit leads to higher
pressures and reduces cooling performance of the system. Too little oil may lead to lubrication problems
in the compressor.
54
Rep. Gr.87 - Air Conditioning
⇒ "3.7 Compressor on Bracket, Removing and Installing", page 27
⇒ "4 Compressor Pulley", page 34 .
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(A/C
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