A3 Mk2: Heating, ventilation, air conditioning system
Also for this vehicle: A3 (8PA) L4-2.0L DSL Turbo (CBEA) (2011), A3 (8PA) L4-2.0L Turbo (CCTA) (2011), A3 L4-2.0L DSL Turbo (CBEA) (2010), A3 L4-2.0L Turbo (BPY) (2006), A3 L4-2.0L Turbo (CBFA) (2008), A3 L4-2.0L Turbo (CCTA) (2010), A3 Mk1, A3 Quattro (8PA) L4-2.0L Turbo (CCTA) (2011), A3 Quattro L4-2.0L Turbo (CBFA) (2009), A3 Quattro L4-2.0L Turbo (CCTA) (2010), A3 Quattro V6-3.2L (BUB) (2008), A3 Quattro V6-3.2L (CBRA) (2009).
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 and air conditioning172 pages
Heating36 pages
- Safety precautions for vehicles with a start/stop system
Dash panel vents and air ducts7 pages
- Air routing in vehicle
Air intake, air outlet and air routing in heater4 pages
- Contact corrosion
Heater components8 pages
- Checking, removing and installing components
- Removing and installing fresh air blower series resistor with overheating fuseN24
- Removing and installing fresh air blowerV2
- Removing and installing fresh air and air recirculation flap control motorV154 (air recirculation flap control motorV113)
Checking operation of fresh air and air recirculation flap control motorV154 and fresh air/air recirculation button3 pages
Operation of heater controls (air conditioner controls), removing and installing11 pages
Functions of heater controls (heater control unitJ65)6 pages
- Actuation of heated rear windowZ1
- Operation of air recirculation mode button and actuation of fresh air and air recirculation flap control motorV154
- Checking actuation of seat heating (optional extra)
- Actuation of engine control unit (on vehicles with petrol direct injection engine "FSI" and/or with engine with map-co
- Actuation of supplementary heater (on vehicles with no air conditioner)
- Removing and installing heater controls / air conditioner controls
- Removing and installing base plate for heater controls / air conditioner controls
- Removing and installing flexible shaft (for air distribution)
- Removing and installing Bowden cable for temperature adjustment
Removing and installing heater5 pages
Dismantling and assembling heater4 pages
Air conditioner136 pages
Safety precautions when working on vehicles fitted with an air conditioner and for handling refrigerant7 pages
- Safety precautions when handling refrigerant
- Safety precautions for vehicles with a start/stop system
Working on refrigerant circuit / draining refrigerant circuit3 pages
- Painting work on vehicles fitted with an air conditioner
Notes on general repairs3 pages
Servicing refrigerant circuit8 pages
- Exploded view of refrigerant circuit components
- Removing and installing high-pressure senderG65
- Checking pressure signal from high-pressure senderG65
- O-rings for refrigerant circuit
- Detaching air conditioner compressor from holder/attaching (vehicles with 4 or 6-cyl. engine)
- Detaching air conditioner compressor from holder/attaching (vehicles with 5-cyl. engine)
- Checking activation signal for air conditioner compressor regulating valveN280
Replacing air conditioner compressor pulley13 pages
- Replacing air conditioner compressor pulley ("Denso" make, version "1")
Detaching pulley from air conditioner compressor/re-attaching ("Denso" make, version "1")3 pages
- Replacing air conditioner compressor pulley ("Denso" make, version "2")
- Detaching pulley from air conditioner compressor/re-attaching ("Denso" make, version "2")
- Replacing air conditioner compressor pulley ("Denso" make, version "3")
- Detaching pulley from air conditioner compressor/re-attaching ("Denso" make, version "3")
- Replacing air conditioner compressor pulley ("Zexel / Valeo" make)
- Detaching pulley from air conditioner compressor/re-attaching ("Zexel/Valeo" make)
- Replacing air conditioner compressor pulley ("Sanden" make)
- Replacing air conditioner compressor pulley ("Delphi" make)
Components for control and regulation of air conditioner not located in passenger compartment12 pages
Components not located in passenger compartment3 pages
- Removing and installing air quality sensorG238
- Mode of operation of air quality sensorG238
- Checking air quality sensorG238
- Checking vent frame
- Checking and cleaning plenum chamber water drain
Checking, removing and installing cover and grille of fresh-air intake3 pages
Components for control and regulation of air conditioner located in passenger compartment16 pages
Components located in passenger compartment3 pages
- Removing and installing dash panel vent
Cleaning air conditioner evaporator3 pages
- Removing and installing sunlight penetration photosensorG107
Operation, removing and installing operating and display unit, Climatronic control unitJ2553 pages
- Removing and installing dash panel temperature sensor blowerV42
- Removing, checking and installing condensation drain hose
- Removing and installing left vent temperature senderG150
- Removing and installing right vent temperature senderG151
Checking components actuated by the air conditioning system control unit12 pages
Checking of heated rear windowZ13 pages
Checking actuation of seat heating (optional extra)3 pages
- Checking actuation of supplementary heater
Checking operation of air recirculation flap control motorV113 and fresh-air/air recirculation control button3 pages
- Checking supplementary air heater
Air conditioning unit components21 pages
- Air conditioning unit components for vehicles with manually controlled air conditioner
- Air conditioning unit components for vehicles with automatically controlled air conditioner
Removing and installing air recirculation flap control motorV1133 pages
- Preparing adapter lead for control motor actuation
- Removing and installing centre flap control motorV70
- Removing and installing right temperature flap control motorV159
- Removing and installing evaporator output temperature senderG263
- Removing and installing left footwell vent temperature senderG261
- Removing and installing right footwell vent temperature senderG262
- Removing and installing dust and pollen filter
- Dust and pollen filter with activated charcoal element
Removing and installing fresh air blower control unitJ126 and fresh air blowerV23 pages
- Removing and installing air flow flap control motorV71 with potentiometer for air flow flap control motorG113
- Removing and installing defroster flap control motorV107
- Removing and installing left temperature flap control motorV158 / temperature flap control motorV68
- Removing and installing supplementary air heater elementZ35 (with supplementary air heater control unitJ604)
Removing and installing heat exchanger of air conditioning unit (heater)3 pages
Block diagram of air distribution system6 pages
- Air routing and air distribution in passenger compartment
Air intake, air outlet and air routing in air conditioning unit4 pages
Checking cooling output of air conditioner12 pages
Checking cooling output on vehicles with automatically controlled air conditioner6 pages
Checking cooling output on vehicles with manually controlled air conditioner5 pages
Checking heat output of air conditioner7 pages
Checking heat output on vehicles with automatically controlled air conditioner3 pages
Checking heat output on vehicles with manually controlled air conditioner3 pages
Removing and installing air conditioning unit3 pages
Replacing components which can only be removed and installed after taking out air conditioning unit3 pages
Dismantling and assembling air conditioning unit9 pages
Detaching add-on components from air conditioning unit/re-attaching3 pages
- Dismantling and assembling air conditioning unit
- Flap in outlet to defroster vents of air distribution housing
- Disassembling and assembling evaporator housing
- Removing and installing evaporator
- Starting up air conditioner after charging refrigerant circuit
- Capacities
Air conditioner with refrigerant R134a › Air conditioner202 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 tools8 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
Auxiliary heating › Aux. heater/heater booster87 pages
- Safety precautions when working on vehicles fitted with auxiliary heater
- Notes on general repair work on vehicles fitted with auxiliary heater
- Rules for cleanliness when working on auxiliary heater (and fuel system)
Layout of components for auxiliary heater in vehicle8 pages
Auxiliary heater remote control buttons and indicator lamp2 pages
- Checking and replacing batteries in hand-held transmitter for auxiliary heater remote control
- Adapting hand-held transmitter for remote control in auxiliary heater control unit J364
Switching auxiliary heating/ventilation on and off via dash panel insert3 pages
Fuel extraction for auxiliary heater15 pages
- Components for fuel extraction for auxiliary heater
Removing and installing fuel extraction pipe2 pages
- Removing and installing fuel extraction pipe
- Checking operation of fuel shut-off valve N109
- Routing of fuel pipe to auxiliary heater
Checking fuel delivery volume of metering pump V546 pages
Checking and adjusting CO2 content in exhaust gas of auxiliary heater15 pages
Checking and adjusting CO2 content in exhaust gas of auxiliary heater3 pages
Checking components of auxiliary heater7 pages
- List of electrical checks
- Test step 1 (glow plug with flame monitor Q8)
- Test step 2 (overheating fuse S24 / overheating sensor G189 and temperature sensor G18)
- Characteristic resistance curve of overheating fuse S24 / overheating sensor G189
- Characteristic resistance curve of temperature sensor G18
- Test step 3 (fuel pre-heating heater element Z66 and fuel shut-off valve N109)
Functional description of auxiliary heater11 pages
Functional description of auxiliary heater2 pages
Control sequence on start-up of auxiliary heater (also as additional heater)3 pages
Auxiliary heater control sequence on load change (from full to part-load mode and vice versa)3 pages
- Control sequence on shutoff of auxiliary heater
- Auxiliary heater temperature control curve
Incorporation of auxiliary heater into coolant circuit9 pages
- Incorporation of auxiliary heater on vehicles with heater coolant shut-off valve N279
Operation of heater coolant shut-off valve N279 , removing and installing4 pages
- Non-return valve in coolant hose
- Incorporation of auxiliary heater on vehicles without heater coolant shut-off valve N279
- Bleeding coolant circuit
Removing and installing auxiliary heater5 pages
- Examples for assignment of different part numbers and versions
Removing and installing auxiliary heater3 pages
Dismantling and assembling auxiliary heater13 pages
- Detaching and re-attaching add-on components at auxiliary heater
Removing and installing circulation pump V553 pages
- Dismantling and assembling auxiliary heater
- Design of auxiliary heater control unit J364 and combustion air blower V6
- Checking installation position of glow plug with flame monitor Q8
- Attaching connection for coolant hoses to auxiliary heater
- Removing and installing combustion air intake manifold
- Assembling burner housing with heat exchanger and outer casing
- Assembling auxiliary heater control unit J364 and burner element
- Removing and installing overheating fuse S24 / overheating sensor G189 and temperature sensor G18
Block diagram of auxiliary heater2 pages
Activation of auxiliary heater with remote control2 pages
- Block diagram of auxiliary heater activation with remote control
- Fitting location for remote control receiver for auxiliary heater R64