A4 Mk1: Heating, ventilation, air conditioning system
Also for this vehicle: A4 Cabriolet L4-1.8L Turbo (AMB) (2005), A4 Cabriolet L4-2.0L Turbo (BWT) (2007), A4 Cabriolet Mk2, A4 Cabriolet V6-3.0L (AVK) (2003), A4 Mk2, A4 Mk3, A4 Quattro Cabriolet L4-2.0L Turbo (BWT) (2009), A4 Quattro Cabriolet V6-3.0L (BGN) (2005), A4 Quattro Cabriolet V6-3.2L (BKH) (2007), A4 Quattro Sedan L4-1.8L Turbo (AEB) (1998), A4 Quattro Sedan L4-1.8L Turbo (ATW) (2000), A4 Quattro Sedan L4-1.8L Turbo (AWM) (2001), A4 Quattro Sedan L4-2.0L Turbo (BPG) (2005), A4 Quattro Sedan L4-2.0L Turbo (CAEB) (2009), A4 Quattro Sedan V6-2.8L (ACK) (1997), A4 Quattro Sedan V6-3.0L (AVK) (2002), A4 Quattro Sedan V6-3.2L (BKH) (2005), A4 Quattro Wagon (8K5) L4-2.0L Turbo (CAEB) (2011), A4 Quattro Wagon L4-1.8L Turbo (AEB) (1999), A4 Quattro Wagon L4-1.8L Turbo (ATW) (2000), A4 Quattro Wagon L4-1.8L Turbo (AWM) (2001), A4 Quattro Wagon L4-2.0L Turbo (BPG) (2005), A4 Quattro Wagon L4-2.0L Turbo (CAEB) (2009), A4 Quattro Wagon V6-2.8L (AHA) (1998), A4 Quattro Wagon V6-3.0L (AVK) (2002), A4 Quattro Wagon V6-3.2L (BKH) (2005), A4 Sedan L4-1.8L Turbo (AEB) (1997), A4 Sedan L4-1.8L Turbo (ATW) (2000), A4 Sedan L4-1.8L Turbo (AWM) (2001), A4 Sedan L4-2.0L Turbo (BPG) (2005), A4 Sedan V6-2.8L (AFC) (1996), A4 Sedan V6-2.8L (AHA) (1998), A4 Sedan V6-3.0L (AVK) (2002), A4 Sedan V6-3.2L (BKH) (2007), A4 V6-3.0L (AVK) (2004).
Steering & suspension
Body & interior
Engine
Transmission
General
Heating & A/C
Choose Sections to see everything in a chapter, or a chapter title to start at its first page.
- 06Heating, ventilation, air conditioning systemHeating, ventilation, air conditioning system: Sections
Heating, air conditioner137 pages
Self diagnosis, V.A.G Inspection Service23 pages
Air conditioner self-diagnosis6 pages
Performing the self-diagnosis2 pages
- Final control diagnosis
- Basic setting
- Erasing fault memory, ending output
Encoding operating and display unit -E874 pages
Reading measured value block3 pages
- Electrical check of rear window heating
Heating33 pages
Repairing heating - vehicles up to Model Year 199612 pages
- Heating, heater control and air ducts
- Dismantling and assembling heating
- Removing and installing heater control
- Removing and installing heater control Bowden cables
- Connection diagram for Bowden cables on the heater control
- Removing and installing Bowden cables on the heater control
- Connection diagram for Bowden cables on the heater control
- Removing and installing fresh-air blower series resistor -N24
- Removing and installing the fresh-air blower -V2-
- Removing and installing footwell vent
- Removing and installing heater
- Removing and installing heating system heat exchanger
Repairing heating - vehicles from Model Year 199713 pages
- Heating, heater control and air ducts
- Removing and installing heater control
- Removing and installing heater control Bowden cables
- Connection diagram for Bowden cables on the heater control
- Removing and installing Bowden cables on the heater control
- Connection diagram for Bowden cables on the heater control
- Removing and installing intermediate piece for defroster duct
- Replacing the bulb for heater control
- Removing and installing fresh-air blower series resistor -N24
- Removing and installing the fresh-air blower -V2
- Removing and installing positioning motor for fresh-air/recirculated-air flap -V154
- Checking the function of the positioning motor for the fresh-air/recirculated-air flap -V154 and the switch -E159
- Removing and installing heater
Servicing electrical additional heater - Vehicles with TDI engine 06.94 ä2 pages
Air conditioner81 pages
- Safety precautions when working on cars with air conditioners and when handling refrigerant
- Notes on general repairs
Repair work on the coolant circuit - vehicles up to Model Year 19966 pages
Repair work on the coolant circuit - vehicles from Model Year 19974 pages
Removing compressor from and attaching it to bracket; removing and installing compressor bracket4 pages
Components for the control and regulation of air conditioners up to Model Year 199619 pages
- Components in the engine compartment
- Check condensation drain valve
- Removing and installing the condensation drainage valve
- Components in the passenger compartment
- Removing and installing operating and display unit -E87
- Replacing the bulbs in the operating and display unit -E87
- Removing and installing the fresh-air blower -V2
- Removing and installing fresh-air blower control unit -J126
- Removing and installing footwell vent
- Removing and installing footwell/defrost flap positioning motor -V85
- Removing and installing temperature flap positioning motor -V68
- Removing and installing central flap positioning motor -V70
- Removing and installing the two-way valve for the fresh-air and recirculated-air flap -N63
- Connection diagram for vacuum hoses
- Testing vacuum system
- Removing and installing the dash panel temperature sensor -G56
- Removing and installing the sunlight penetration photosensor -G107
- Removing and installing the dash panel temperature sensor blower -V42
Components for the control and regulation of the air conditioner from Model Year 199714 pages
- Components in the engine compartment
- Components in the passenger compartment
- Removing and installing operating and display unit -E87
- Removing and installing dash panel temperature sensor blower -V42
- Removing and installing the fresh-air blower -V2
- Removing and installing fresh-air blower control unit -J126
- Removing and installing centre vent temperature sensor -G191
- Removing and installing the footwell temperature sensor -G192
- Removing and installing temperature flap positioning motor -V68
- Removing and installing central flap positioning motor -V70
- Removing and installing footwell/defrost flap positioning motor -V85
- Removing and installing air-flow flap positioning motor -V71
- Removing and installing the fresh air intake duct temperature sensor -G89
- Checking air conditioner refrigeration capacity
Servicing electrical additional heater - Vehicles with TDI engine 06.94 ä2 pages
Repairing the refrigeration circuit - vehicles up to Model Year 19969 pages
- Assignment of air conditioner compressors
- Removing and installing refrigerant lines to the evaporator
- Removing and installing restrictor
- Removing and installing reservoir
- Removing and installing refrigerant line on Nippondenso/Denso compressor
- Removing and installing compressor
- Removing and installing air conditioner compressor speed sender -G111
- Filling quantities
Removing and installing air conditioner - vehicles up to Model Year 19966 pages
- Removing and installing the air conditioner heat exchanger
- Removing and installing air-flow flap positioning motor -V71
- Removing and installing the fresh air intake duct temperature sensor -G89
- Removing and installing vacuum reservoir with non-return valve
- Removing and installing the vacuum unit for the fresh-air and recirculated-air flap
Dismantling and assembling air conditioner - vehicles up to Model Year 19963 pages
Repairing refrigerant circuit - vehicles from Model Year 19975 pages
- Removing and installing air conditioner - vehicles from Model Year 1997
Dismantling and assembling air conditioner - vehicles from Model Year 19972 pages
Air conditioner with refrigerant R134a › Air conditioner201 pages
Warning instructions when working on vehicles with high-voltage system3 pages
General information on air conditioning systems42 pages
- General notes
- Introduction
- Safety measures for vehicles with start/stop system
- Other reference material
Principles of air conditioning systems4 pages
- General work safety
- Product properties
- Handling refrigerant
- Handling pressure vessels
- Safety regulations for working with extraction and charging systems
- Safety measures for working on vehicles with air conditioning system and for handling refrigerant R134a
- Before using air conditioner after system has been re-charged
General information on refrigerant circuit47 pages
- Components of refrigerant circuit
Layout of components of refrigerant circuit and their influence on high-pressure and low-pressure sides16 pages
- Mechanically driven air conditioner compressor
- Electrically driven air conditioner compressor for vehicles with a high-voltage system
- Condenser
- Evaporator
- Reservoir
- Restrictor
- Receiver
- Expansion valve
- Expansion valve with refrigerant shut-off valve 2 for hybrid batteryN517
- Refrigerant shut-off valve 1 for hybrid batteryN516
- Refrigerant line with internal heat exchanger
- Quick-release couplings on refrigerant line
- O-rings
- Pipes and hoses of refrigerant circuit
- High-pressure safety valve
Design of refrigerant circuit3 pages
- Refrigerant circuit with electrically driven air conditioner compressor (with and without battery cooling module)
Connections for quick-release coupling in refrigerant circuit3 pages
Switches and senders in refrigerant circuit and related connections11 pages
- High-pressure switch for air conditioning systemF23
- High-pressure switch for magnetic clutchF118
- Low-pressure switch for air conditioning systemF73
- Connections with valve for refrigerant circuit switches
- Air conditioning system pressure switchF129
- High-pressure senderG65 and pressure sender for refrigerant circuitG805
- Refrigerant pressure and temperature senderG395
- Air conditioner compressor regulating valveN280
- Air conditioning system compressor speed senderG111
- Refrigerant temperature senderG454
Electrical components not installed in refrigerant circuit2 pages
Pressures and temperatures in refrigerant circuit3 pages
Tests and measurements performed with pressure gauge2 pages
Air conditioner service and recycling units3 pages
- Repair notes for refrigerant circuit
Laws and regulations4 pages
Refrigerant circuit22 pages
- Important repair notes for air conditioning systems
- Converting refrigerant circuits from refrigerant R12 to refrigerant R134a
Working with the air conditioner service station9 pages
- Important notes for working with the air conditioner service station
- Connecting air conditioner service station for measuring and testing
- Discharging refrigerant circuit with air conditioner service station
- Evacuating refrigerant circuit with air conditioner service station
- Charging refrigerant circuit with air conditioner service station
- Starting up air conditioner after charging
- Pouring refrigerant into reservoir (charging cylinder or storage vessel) of air conditioner service station
- Discharging air conditioner service station
Blowing out refrigerant circuit with compressed air and nitrogen2 pages
Flushing (cleaning) refrigerant circuit with refrigerant R134a4 pages
Tracing leaks in refrigerant circuit4 pages
Problems with refrigerant circuit4 pages
Connecting air conditioner service station6 pages
- Connecting air conditioner service station on vehicles with a connection on the low and high-pressure end of the refrigerant cir
Connecting air conditioner service station on vehicles with no connection on the low-pressure end of the refrigerant circuit4 pages
Checking pressures15 pages
Checking pressures in refrigerant circuit with air conditioner service station (with ignition switched off)4 pages
Checking pressures on vehicles with a restrictor and reservoir (with internally regulated air conditioner compressor)2 pages
Checking pressures on vehicles with an expansion valve and receiver (with internally regulated air conditioner compressor)2 pages
Checking pressures on vehicles with restrictor, reservoir and air conditioner compressor regulating valveN280 (with externally r2 pages
Checking pressures on vehicles with expansion valve, receiver and air conditioner compressor regulating valveN280 (with external2 pages
Checking pressures on vehicles with an electrically driven air conditioner compressor (vehicles with a high-voltage system)2 pages
Renewing components of refrigerant circuit8 pages
Renewing components7 pages
- Leaking or damaged components (except air conditioner compressor, reservoir or receiver)
- Leaking or damaged components (except air conditioner compressor, reservoir or receiver)
- Renewing air conditioner compressor without the need for refrigerant circuit cleaning
- Renewing air conditioner compressor on account of leakage or internal damage
- Renewing receiver or reservoir and restrictor after cleaning refrigerant circuit
- Renewing receiver or reservoir without the need for refrigerant circuit cleaning
- Renewing dryer cartridge/desiccant bag without the need for refrigerant circuit cleaning
Capacities for refrigerant R134a, refrigerant oil and approved refrigerant oils43 pages
Capacities for refrigerant R134a20 pages
- Capacities for Audi A1 (8X_) 2011 ?
- Capacities for Audi A2 (8Z_) 2001 ?
- Capacities for Audi A3 (8L_) 1997 ? and Audi TT (8N_) 1999 ?
- Capacities for Audi A3 (8P_) 2004 ?, Audi Q3 (8U_) 2012 ?
- Capacities for Audi TT (8J_) 2007 ?
- Capacities for Audi 80 (8A_/8C_), Audi Coupé (8B_), Audi Cabriolet (8G_) ? 2002
- Capacities for Audi A4 (8D_) 1995 ?
- Capacities for Audi A4 (8E_) 2001 ?, Audi A4 Cabriolet (8H_) 2003 ?
- Capacities for Audi A4 (8K_) 2008 ?, Audi A5 Coupé and Sportback (8T_) 2008 ?, Audi Q5 (8R_) 2008 ?, Audi A5 Cabriolet (8F_) 200
- Capacities for Audi 100 / Audi A6 (4A_) ? 1998
- Capacities for Audi A6 (4B_) 1998 ? and Audi allroad (4B_) ? 2005
- Capacities for Audi A6 (4F_) 2005 ?
- Capacities for Audi A6 (4G_) 2011 ?, Audi A7 (4G_) 2011 ?, Audi A6 hybrid (4G_) 2012 ?
- Capacities for Audi V8 (4C_) ? 1994
- Capacities for Audi A8 (4D_) 1994 ?
- Capacities for Audi A8 (4E_) 2003 ?
- Capacities for Audi A8 (4H_) 2010 ?, Audi A8 hybrid (4H_) 2012 ?
- Capacities for Audi Q7 (4L_) 2006 ?
- Capacities for Audi R8 (42_) 2008 ?
Approved refrigerant oils and refrigerant oil capacities22 pages
- Approved refrigerant oils
- Refrigerant oil capacities
- Capacities for Audi A1 (8X_) 2011 ?
- Capacities for Audi A2 (8Z_) 2001 ?
- Capacities for Audi A3 (8L_) 1997 ? and Audi TT (8N_) 1999 ?
- Capacities for Audi A3 (8P_) 2004 ?, Audi Q3 (8U_) 2012 ?
- Capacities for Audi TT (8J_) 2007 ?
- Capacities for Audi 80 (8A_/8C_), Audi Coupé (8B_), Audi Cabriolet (8G_) ? 2002
- Capacities for Audi A4 (8D_) 1995 ?
- Capacities for Audi A4 (8E_) 2001 ?, Audi A4 Cabriolet (8H_) 2003 ?
- Capacities for Audi A4 (8K_) 2008 ?, Audi A5 Coupé and Sportback (8T_) 2008 ?, Audi Q5 (8R_) 2008 ?, Audi A5 Cabriolet (8F_) 200
- Capacities for Audi 100 / Audi A6 (4A_) ? 1998
- Capacities for Audi A6 (4B_) 1998 ? and Audi allroad ? 2005
- Capacities for Audi A6 (4F_) 2005 ?
- Capacities for Audi A6 (4G_) 2011 ?, Audi A7 (4G_) 2011 ?, Audi A6 hybrid (4G_) 2012 ?
- Capacities for Audi V8 (4C_) ? 1994
- Capacities for Audi A8 (4D_) 1994 ?
- Capacities for Audi A8 (4E_) 2003 ?
- Capacities for Audi A8 (4H_) 2010 ?, Audi A8 hybrid (4H_) 2012 ?
- Capacities for Audi Q7 (4L_) 2006 ?
- Capacities for Audi R8 (42_) 2008 ?
Test equipment and tools7 pages
List of testers, tools and materials4 pages
- Tools and materials available from regional sales centre or importer
- Commercially available tools and materials
- Improvised tools