Audi Q7 2007 Operating instructions

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.
Repair Manual
Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning
Engine ID BAR BHK CAT
A
CNR
B
CJW
C
CJW
B
CJW
E
CTW
A
CTW
B
Edition 04.2013
Service
Service Department. Technical Information

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.
List of Workshop Manual Repair Groups
Repair Group
80 - Heating, Ventilation
87 - Air Conditioning
Technical information should always be available to the foremen and mechanics, because their
careful and constant adherence to the instructions is essential to ensure vehicle road-worthiness and
safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a
matter of course, be observed.
Service
All rights reserved.
No reproduction without prior agreement from publisher.
Copyright © 2016 Audi AG, Ingolstadt D3E8002249C

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.
Contents
80 - Heating, Ventilation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1 Heater, Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
87 - Air Conditioning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1 A/C and Refrigerant Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.2 Safety Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
1.3 Safety Precautions for Vehicles with Start/Stop System . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.4 Refrigerant Circuit, Draining . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
1.5 Working on the Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.6 Painting on Vehicles with Air Conditioning System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
1.7 Further information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
2 General Repair Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.2 Information for Vehicles with and without Parking/Auxiliary Heater (if Heat Output is Poor)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
2.3 OBD and A/C System, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.4 Information for Vehicles with Start/Stop System . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
3 Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.2 Component Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
3.3 High Pressure Sensor G65 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18
3.4 High Pressure Sensor G65 , Checking Pressure Signal . . . . . . . . . . . . . . . . . . . . . . . . . . 19
3.5 Refrigerant Temperature Sensor G454 Function and Signal Utilization . . . . . . . . . . . . . . 23
3.6 Refrigerant Circuit O-Ring Seals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
3.7 Compressor on Bracket, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.8 A/C Compressor Regulator Valve N280 , Checking Activation Signal . . . . . . . . . . . . . . . . 30
4 Compressor Pulley . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.2 A/C Compressor Belt Pulley, Overview, Version “1” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34
4.3 Belt Pulley, Removing and Installing at Compressor, Version “1” . . . . . . . . . . . . . . . . . . . . 37
4.4 A/C Compressor Belt Pulley, Overview, Version “2” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
4.5 Belt Pulley, Removing and Installing at Compressor, Version “2” . . . . . . . . . . . . . . . . . . . . 42
4.6 A/C Compressor Belt Pulley Overview, Version “3” . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43
4.7 Belt Pulley on A/C Compressor, Removing and Installing, Version “3” . . . . . . . . . . . . . . . . 45
5 A/C System Control and Regulation Components Outside Passenger Compartment . . . . 48
5.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
5.2 A/C System Components Not Inside Passenger Compartment . . . . . . . . . . . . . . . . . . . . . . 49
5.3 A/C System Fresh Air Intake Shaft, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . 55
5.4 Air Quality Sensor G238 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 57
5.5 Air Quality Sensor G238 Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 58
5.6 Air Quality Sensor G238 , Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
5.7 Vent Frame, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 64
5.8 Plenum Chamber Water Drain, Checking and Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . 64
6 Incorporation of the A/C System in Vehicle Coolant Circuit . . . . . . . . . . . . . . . . . . . . . . . . 66
6.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
6.2 Incorporation on Vehicles Without Fuel-Driven Auxiliary Heater . . . . . . . . . . . . . . . . . . . . 67
6.3 Incorporation on Vehicles With Fuel-Driven Auxiliary Heater . . . . . . . . . . . . . . . . . . . . . . . . 70
6.4 Coolant Recirculation Pump V50 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . 72
6.5 Coolant Shut-Off Valve N82 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
7 Coolant Circuit, Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
7.1 A/C System Coolant Circuit Section, Bleeding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 78
Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
Contents i

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.
8 Components Actuated by A/C System, Electrical Test . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.2 Rear Window Defogger Z1 , Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 80
8.3 Heated Seats and Seat Ventilation, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
8.4 Auxiliary Heater Heating Element Z35 , Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
8.5 Testing the Fuel-Driven Auxiliary Heater . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 90
9 A/C System Control Components Inside Passenger Compartment . . . . . . . . . . . . . . . . . . 92
9.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 94
9.2 Front A/C System Components in Passenger Compartment (Illustration of Left Side) . . . . 96
9.3 Sunlight Photo Sensor G107 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . 103
9.4 Interior Temperature Sensor Fan V42 , Removing and Installing . . . . . . . . . . . . . . . . . . . . 104
9.5 Climatronic Control Module J255 Front A/C Control Head Information, Removing and
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 105
9.6 Left Footwell Vent Temperature Sensor G261 , Removing and Installing . . . . . . . . . . . . 111
9.7 Left Footwell Door Motor V108 , Removing and Installing, “Comfort” Version . . . . . . . . . . 112
9.8 Left Temperature Door Motor V158 , Removing and Installing, “Comfort” Version . . . . . . 113
9.9 Retaining plate with Left Footwell Door Motor V108 and Left Temperature Door Motor V158 ,
Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 114
9.10 Left Heater Core Covers, Removing and Installing, Front A/C Unit Installed . . . . . . . . . . . . 117
9.11 Preparing Adapter Cables for Control Motor Actuation . . . . . . . . . . . . . . . . . . . . . . . . . . . . 117
9.12 Defroster Door Motor V107 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 118
9.13 Left Center Vent Motor V110 , Removing and Installing, “Comfort” Version Only . . . . . . 121
9.14 Left Side Vent Motor V299 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 125
9.15 Retaining plate with Defroster Door Motor V107 , Left Side Vent Motor V299 (and Left Center
Vent Motor V110 ), Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 128
9.16 Left Front Upper Body Vent Temperature Sensor G385 , Removing and Installing . . . . . . 131
9.17 Indirect Ventilation Door Motor V213 , Removing and Installing . . . . . . . . . . . . . . . . . . . . 132
9.18 Front Heater Core, Removing and Installing, A/C Unit Installed . . . . . . . . . . . . . . . . . . . . 134
9.19 Auxiliary Heater Heating Element Z35 , Removing and Installing . . . . . . . . . . . . . . . . . . . . 140
9.20 Front A/C System Components in Passenger Compartment (Illustration of Right Side) . . 144
9.21 Right Temperature Door Motor V159 (or Left Temperature Door Motor V158 ), Removing and
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 151
9.22 Right Footwell Door Motor V109 (or Left Footwell Door Motor V108 ), Removing and
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 152
9.23 Retaining Plate with Control Motors V158 ( V159 ) and V109 ( V108 ), Removing and
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 153
9.24 Right Heater Core Covers, Removing and Installing, Front A/C Unit Installed . . . . . . . . . . 156
9.25 Right Center Vent Motor V111 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . 156
9.26 Right Side Vent Motor V300 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 157
9.27 Retaining Plate with Control Motors V111 and V300 , Removing and Installing . . . . . . . . 158
9.28 Right Front Upper Body Vent Temperature Sensor G386 , Removing and Installing . . . . 161
9.29 Evaporator Vent Temperature Sensor G263 , Removing and Installing . . . . . . . . . . . . . . 162
9.30 Fresh Air Blower V2 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 163
9.31 Fresh Air Blower Control Module J126 , Removing and Installing . . . . . . . . . . . . . . . . . . . . 164
9.32 Recirculation Door Motor V113 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . 166
9.33 Fresh Air Intake Duct Temperature Sensor G89 , Removing and Installing . . . . . . . . . . . . 167
9.34 Right Footwell Vent Temperature Sensor G262 , Removing and Installing . . . . . . . . . . . . 168
9.35 Dust and Pollen Filter, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 169
9.36 Dust and Pollen Filter with Activated Charcoal Filter Unit . . . . . . . . . . . . . . . . . . . . . . . . . . 170
9.37 Front Condensation Water Drain Hose, Checking, Removing and Installing . . . . . . . . . . . . 171
9.38 Rear A/C System Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 176
9.39 Rear A/C Unit, Bringing into Service Position . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 180
9.40 Heater Core, Removing and Installing, Rear A/C Unit Installed . . . . . . . . . . . . . . . . . . . . . . 182
9.41 Rear Fresh Air Blower V80 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 184
9.42 Rear Fresh Air Blower Control Module J391 , Removing and Installing . . . . . . . . . . . . . . 185
9.43 Right Rear Temperature Door Motor V314 , Removing and Installing . . . . . . . . . . . . . . . . 186
9.44 Right Rear Air Door Motor V240 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . 186
Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
ii Contents

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.
9.45 Left Rear Air Door Motor V239 , Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . 187
9.46 Left Rear Temperature Door Motor V313 , Removing and Installing . . . . . . . . . . . . . . . . . . 188
9.47 Right Rear Vent Temperature Sensor G406 and Left Rear Vent Temperature Sensor G405 ,
Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 189
9.48 Rear A/C Display Control Head E265 , Removing and Installing . . . . . . . . . . . . . . . . . . . . 190
9.49 Rear Center Console Vents, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . 191
9.50 Left B-Pillar/Footwell Shut-Off Door Motor V212 , Removing and Installing . . . . . . . . . . . . 192
9.51 Left Rear Upper Body Vent Motor V315 , Removing and Installing . . . . . . . . . . . . . . . . . . 192
9.52 Right Rear Upper Body Vent Motor V316 , Removing and Installing . . . . . . . . . . . . . . . . . . 194
9.53 Right B-Pillar/Footwell Shut-Off Door Motor V211 , Removing and Installing . . . . . . . . . . 195
9.54 Rear Condensation Water Drain, Checking, Removing And Installing . . . . . . . . . . . . . . . . 196
10 A/C System Evaporator, Cleaning . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
10.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
10.2 Causes of Odor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 198
10.3 Front (and Rear) A/C System Evaporator, Cleaning, Using Ultrasound A/C Cleaner
VAS6189A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 200
11 Incorporation of Rear A/C Unit into Refrigerant And Coolant Circuit . . . . . . . . . . . . . . . . . . 203
11.1 Incorporation of Rear A/C Unit into Vehicle Refrigerant- and Coolant Circuit . . . . . . . . . . 203
12 Air Ducts in and to Front and Rear A/C Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
12.1 Air Duct to and from Front A/C Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 205
12.2 Air Duct in Front A/C Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 206
12.3 Instrument Panel Vents and Air Ducts in Front (and Rear) Passenger Compartment . . . . 209
12.4 Air Duct in Rear A/C Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 211
12.5 Air Channels and Rear Vents (on Vehicles with Rear A/C Unit) . . . . . . . . . . . . . . . . . . . . 212
13 A/C Unit, Checking Cooling Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
13.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
13.2 Front A/C System, Testing Cooling Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 215
13.3 Rear A/C System, Testing Cooling Performance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 228
14 Heating Performance of A/C System, Checking . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 231
14.1 Coolant Recirculation Pump V50 ( Water Pump V36 ) Functionality, Checking . . . . . . . . 234
15 Refrigerant Circuit, Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
15.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 241
15.2 Refrigerant Circuit, Servicing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
15.3 Refrigerant Lines, Disconnecting from Compressor and Connecting . . . . . . . . . . . . . . . . 250
15.4 Compressor, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 252
15.5 Refrigerant Temperature Sensor G454 , Removing and Installing . . . . . . . . . . . . . . . . . . 255
15.6 Refrigerant Lines, Disconnecting from Condenser and Connecting . . . . . . . . . . . . . . . . . . 256
15.7 Condenser, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 258
15.8 Connection Points of Refrigerant Lines, Loosening and Assembling . . . . . . . . . . . . . . . . 262
15.9 Dryer Cartridge, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 264
15.10 Front Expansion Valve, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 269
15.11 Refrigerant Lines from Rear Expansion Valve, Disconnecting and Connecting . . . . . . . . 272
15.12 Rear Expansion Valve, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 275
16 Compressor, Removing and Installing (Vehicles with 8-Cylinder Engine and 12-Cylinder TDI
Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
16.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 277
16.2 Compressor, Removing and Installing (Vehicles with 8-Cylinder TDI Engine) . . . . . . . . . . 277
16.3 Compressor, Removing and Installing (Vehicles with 12-Cylinder TDI Engine) . . . . . . . . . . 280
16.4 Compressor, Removing and Installing (Vehicles with 8-Cylinder FSI Engine) . . . . . . . . . . 283
16.5 Compressor Drive Unit, Checking and Replacing (Vehicles with 8-Cylinder FSI Engine) . . 290
16.6 Compressor Input Shaft, Loosening and Tightening (Vehicles with 8-Cylinder FSI Engine)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
16.7 Compressor Input Shaft, Removing and Installing (Vehicles with 8-Cylinder FSI Engine)
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 292
16.8 Drive Plate with Overload Protection, Removing and Installing (Vehicles with 8-Cylinder FSI
Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 293
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Contents iii

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16.9 Drive Plate Run-Out with Overload Protection, Checking and Adjusting (Vehicles with 8-
Cylinder FSI Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
16.10 Drive Plate, Removing from A/C Compressor and Installing (Vehicles with 8-Cylinder FSI
Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 294
16.11 Drive Plate with Cylindrical Roller Bearing, Removing and Installing (Vehicles with 8-Cylinder
FSI Engine) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 295
17 Front A/C Unit, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297
17.1 Front A/C Unit, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 297
17.2 Heater Core, Removing and Installing, with Front A/C Unit Removed . . . . . . . . . . . . . . . . 303
17.3 Front A/C Unit Evaporator, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 306
18 Front A/C Unit, Disassembling and Assembling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307
18.1 General Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 307
18.2 Attachments, Removing from Front A/C Unit and Installing . . . . . . . . . . . . . . . . . . . . . . . . 307
18.3 Front A/C Unit, Disassembling and Assembling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 313
18.4 Front A/C Unit Air Distribution Housing, Disassembling and Assembling . . . . . . . . . . . . . . 316
18.5 Front A/C Unit Evaporator Housing, Disassembling and Assembling . . . . . . . . . . . . . . . . 317
19 Rear A/C Unit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 321
19.1 Rear Evaporator, Removing and Installing, A/C Unit Installed . . . . . . . . . . . . . . . . . . . . . . 321
19.2 Coolant Hose and Refrigerant Line Pass-Through to Rear Wheel Housing, Removing and
Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 322
19.3 Rear A/C Unit, Removing and Installing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 325
20 Rear A/C Unit, Disassembling and Assembling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 327
20.1 Attachments, Removing from Rear A/C Unit and Installing . . . . . . . . . . . . . . . . . . . . . . . . 327
20.2 Rear A/C Unit, Disassembling and Assembling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 329
21 A/C System, Operating after Filling Refrigerant Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . 332
22 Refrigerant and Refrigerant Oil Capacities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 334
23 Special Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 335
24 Revision History . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 336
Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
iv Contents

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80 – Heating, Ventilation
1 Heater, Servicing
(Edition 04.2013)
♦ There is only one A/C system offered for vehicles of this series.
Heating without an A/C system is not currently offered.
♦ All information required for servicing the heating and A/C sys‐
tem can be found the A/C system. Refer to
⇒ G r.87 “Air Conditioning”, page 2 .
Audi Q7 2007 ➤
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1. Heater, Servicing 1

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87 – Air Conditioning
1 A/C and Refrigerant Safety Precau‐
tions
⇒ “1.1 General Information”, page 2
⇒ “1.2 Safety Precautions”, page 2
⇒ “1.3 Safety Precautions for Vehicles with Start/Stop System”,
page 3
⇒ “1.4 Refrigerant Circuit, Draining”, page 3
⇒ “1.5 Working on the Refrigerant Circuit”, page 4
⇒ “1.6 Painting on Vehicles with Air Conditioning System”,
page 4
⇒ “1.7 Further information”, page 5
1.1 General Information
The assemblies and piping system of the air conditioner are filled
with the following refrigerant:
1.1.1.2 Tetrafluorethane (CF3-CH2F or CH2F-CF3)
Currently, this refrigerant is known under the following trade
names R134a, H-FKW 134a, SUVA 134a and KLEA 134a (other
trade names may be used in other countries).
1.2 Safety Precautions
The following safety measures should be observed for these re‐
frigerants (additional guidelines apply in individual countries).
If is necessary to open the refrigerant circuit during service work,
discharge the refrigerant circuit first. Refer to
⇒ “1.4 Refrigerant Circuit, Draining”, page 3 . In doing so, the
utmost care is to be taken to avoid contact with liquid refrigerant
or refrigerant vapors. Should refrigerant nevertheless escape,
avoid inhaling the resultant refrigerant/air mixture.
Always wear hand and eye protection (gloves and goggles) when
working around the A/C refrigerant system and switch on work‐
shop exhaust/ventilation systems.
Reason:
Intensive exposure to refrigerant on unprotected parts of the body
will result in frostbite.
WARNING
Keep an eye bath on hand.
If liquid refrigerant has come in contact with your skin and eyes,
immediately flush with cool water for 15 minutes.
Then apply eye drops and consult a doctor immediately even
if no pain is felt.
The doctor must be informed, which type of refrigerant caused
the freezing.
Should refrigerant come into contact with other parts of the body
despite compliance with all the pertinent safety measures, these
Audi Q7 2007 ➤
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2 Rep. Gr.87 - Air Conditioning

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are similarly to be rinsed thoroughly in cold water without delay
for at least 15 minutes.
Although refrigerant does not represent a fire hazard, smoking,
welding, soldering and brazing are not permitted in areas exposed
to refrigerant.
Reason:
The high temperature of a naked flame or hot objects causes de‐
composition of refrigerant gas. Inhalation of the resultant toxic
decomposition products leads to dry coughing and nausea.
1.3 Safety Precautions for Vehicles with
Start/Stop System
WARNING
On vehicles with the Start/Stop System, the engine could start
automatically and cause serious personal injury.
♦ If the Start/Stop System is activated (recognizable by a
message in the instrument cluster), it is possible to start
the engine automatically.
♦ Make sure the Start/Stop System is deactivated (ignition
switched off) whenever working on the vehicle.
1.4 Refrigerant Circuit, Draining
Refrigerant is never to be allowed to escape into the atmosphere,
but rather it is to be extracted from the refrigerant circuit using an
extractor or service station. The drained refrigerant will be locally
recycled or is send to an environment-recycling place to the man‐
ufacturer (different or additional laws may apply in individual
companies). For this reason, bring the 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 (A/C
System with Refrigerant R134a; A/C System, General Informa‐
tion).
Reason:
If refrigerant R134a is released into the environment, it enhances
the »green house effect«.
Note
♦ Refrigerant R134a has far less of a greenhouse effect than
R12.
♦ Because R-134a does not contain chlorine atoms, the major
catalyst in ozone depletion, R134a has no ozone depletion
potential. Depletion of the ozone layer in the upper atmos‐
phere is however only brought about by the splitting of carbon–
chlorine bonds (as is the case, for example, with refrigerant
R12).
After discharging the A/C system, disconnect the harness con‐
nector from A/C Compressor Regulator Valve - N280- or from the
High Pressure Sensor - G65- .
Reason:
The A/C Compressor Regulator Valve - N280- is then no longer
activated and compressor runs at idle. The compressor is de‐
signed such that lubrication of compressor components is guar‐
Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
1. A/C and Refrigerant Safety Precautions 3

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anteed by way of an internal oil circuit at idle (provided there is
sufficient refrigerant oil in the compressor).
1.5 Working on the Refrigerant Circuit
Work on refrigerant system should only be performed in a venti‐
lated rooms (workshops). Ensure that there are no working-pits,
basement staircases or shafts within five meters of the circum‐
ference. Extraction systems are to be switched on.
Reason:
The refrigerant emerging is not only colorless and odorless, but
also heavier than air and thus displaces oxygen. If refrigerant gas
does escape even though all the safety precautions have been
followed, there is a risk of suffocating in poorly ventilated areas
and in workshop pits - even if it is not noticeable.
Note
The escaping refrigerant/air mixture should not be inhaled, but
should be sucked out via an existing exhaust ventilation system.
Do not attempt repair on filled air conditioning systems by solder‐
ing, brazing or welding. This pertains also for welding and sol‐
dering work on the vehicle, in the event that parts of the climate
control system may heat up
Reason:
Exposure to heat creates considerable pressure in the system,
which could cause it to burst.
Corrective action:
Discharge the refrigerant circuit. Refer to
⇒ “1.4 Refrigerant Circuit, Draining”, page 3 .
Note
Damaged or leaking parts of the air conditioner are never to be
repaired by welding or soldering them; they are always to be re‐
placed.
When servicing air conditioner, all open components and pipe
connections are to be immediately re-sealed.
Reason:
Moisture will ingress into air conditioner components if they are
left open for a lengthy period. An A/C system that was open for a
longer period of time cannot be filled again without replacing
components of the system.
1.6 Painting on Vehicles with Air Condition‐
ing System
When performing paint work repairs, object temperatures of 80°
C are not to be exceeded in drying booths or their pre-heating
areas.
Reason:
Exposure to heat creates considerable pressure in the system,
which could cause it to burst.
Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
4 Rep. Gr.87 - Air Conditioning