Audi Q7 2007 Repair Manual page 56

Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
3 - Reservoir with Dryer Cartridge
❑ Receiver/dryer is a component of the condenser
❑ The dryer cartridge may only be removed when refrigerant circuit has been discharged; bring vehicle to
a workshop that has the necessary tools and in which the work can be performed accordingly by qualified
personnel. Refer to ⇒ Refrigerant R134a Servicing; Rep. Gr. 87 ; A/C System General Information
(Refrigerant R134a, Servicing; A/C System, General Information).
❑ The dryer cartridge can be replaced as an individual part. Refer to the Parts Catalog.
❑ Dryer cartridge, removing and installing. Refer to
⇒ "15.9 Dryer Cartridge, Removing and Installing ", page 264
4 - Coolant Fan - V7- and Coolant Fan Control (FC) Control Module - J293-
❑ The request to switch on the coolant fan is transmitted to the Engine Control Module (ECM) by front A/
C control head Climatronic Control Module - J255- via the CAN-Bus system. The engine control module
then actuates the fans or the Coolant Fan Control Module - J293- . Use the Vehicle Diagnostic Tester
via the "Guided Fault Finding" function..
❑ The respective engine control module switches the coolant fans (via Coolant Fan Control Module - J293- )
continuously to the desired output. Use the Vehicle Diagnostic Tester via the "Guided Fault Finding"
function.
❑ There are different versions installed depending on the vehicle equipment level. Refer to the Parts Cat‐
alog.
❑ Check actuation of Coolant Fan - V7- by the Climatronic Control Module - J255- front A/C control head.
Use the Vehicle Diagnostic Tester via the "Guided Fault Finding" function. Refer to ⇒ Wiring diagrams,
Troubleshooting & Component locations.
5 - Plenum Chamber Cover with Fresh Air Intake Grille
6 - Air Quality Sensor - G238-
❑ For functionality, refer to
❑ Checking. Refer to
❑ Removing and Installing. Refer to
⇒ "5.4 Air Quality Sensor G238 , Removing and Installing", page 57
❑ The Air Quality Sensor - G238- is installed only on vehicles with a "Comfort" version A/C system.
7 - Fresh Air Intake Housing for A/C System
❑ Removing and Installing. Refer to
⇒ "5.3 A/C System Fresh Air Intake Shaft, Removing and Installing", page 55
8 - Expansion Valve
❑ For evaporator in front A/C unit (installed under instrument panel)
❑ May only be removed when refrigerant circuit has been discharged; bring vehicle to a workshop that has
the necessary tools and in which the work can be performed accordingly by qualified personnel. Refer
to ⇒ Refrigerant R134a Servicing; Rep. Gr. 87 ; A/C System General Information (Refrigerant R134a,
Servicing; A/C System, General Information).
❑ There are different versions. Refer to the Parts Catalog.
❑ Removing and Installing. Refer to
⇒ "15.10 Front Expansion Valve, Removing and Installing", page 269
Note
After the A/C compressor is switch‐
ed off in this vehicle, it may take a
relatively long time for the pressure
on the high pressure side to de‐
crease (the expansion valve(s) is/
are cold, the pressure on the low
pressure side increases quickly af‐
ter deactivation, the expansion
valve(s) closes/close and the refrig‐
erant can only flow slowly to the low
pressure side).
50
Rep. Gr.87 - Air Conditioning
⇒ "5.5 Air Quality Sensor G238 Functionality", page 58
⇒ "5.6 Air Quality Sensor G238 , Checking", page 60
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.
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