Manual sections

Wiring diagrams

• 2.7L V6 5V Bi-Turbo (Engine Codes: Apb, Bel)
• 5 Spd. Manual Transmission - 01A
• 6 Spd. Manual Transmission - 01E
• Abbreviations
• Air Conditioning
• Anti-Lock/traction Control
• Application
• Automatic HVAC System
• Automatic Trans
• Axle Shafts
• Basic Trouble Shooting
• Blowers, Superchargers & Turbochargers
• Brake System - on Board Diagnostic (OBD) - ABS & ESP
• Brake System - on Board Diagnostic (OBD) - ABS & ESP: Diagnosis
• Brakes
• Cabin Air Filter
• Charging System
• Check Lists
• Clutches Manual & Hydraulic
• Communication Devices
• Computer Relearn
• Cooling Fan
• Cruise Control Systems
• Diagnostic Connector Locations
• Differentials & Drive Axles
• Door Locks & Anti-Theft Systems
• Drive Cycles
• Driveline/axles
• Driveshaft & Universal Joints
• DTC Index
• Electrical Component Locations
• Electronic Suspension
• Emission Applications
• Engine
• Engine Performance
• Exhaust
• Exterior Body Panels
• Exterior/interior Trim
• Fuel Supply System - All Engines
• Fuel Supply System - All Engines: Diagnosis
• Fuel System
• Fuses & Circuit Breakers
• Gauges & Instrument Panels
• Heated Glass/defoggers
• Identification
• Ignition System
• Manual Trans
• Mechanical
• Mechanical - Hydraulic
• Metric Conversions
• Mirrors
• Mode 6
• Multiport Fuel Injection (Mfi) - 3.0L V6 Avk
• Oem General Information
• On Board Diagnostic (OBD) - 2001 and Up
• On Board Diagnostic (OBD) - 5 Spd. Automatic Transmission 01V
• On Board Diagnostic (OBD) - 5 Spd. Automatic Transmission 01V: Diagnosis
• On Board Diagnostic (OBD) - 5 Spd. Automatic Transmission, 01L All Wheel Drive: Diagnosis
• On Board Diagnostic (OBD) - Central Locking System, Memory Seats, Ultrasonic Interior Monitor
• On Board Diagnostic (OBD) - HVAC
• On Board Diagnostic (OBD) - HVAC: Diagnosis
• On Board Diagnostic (OBD) - Radio, Navigation, Steering & Telematics
• On Board Diagnostic (OBD) - Radio, Navigation, Steering & Telematics: Diagnosis
• On Board Diagnostic (OBD) - Suspension & Tire Pressure Monitoring
• Procedures
• Reset Procedures
• Restraints
• Seats
• Specifications
• Starter
• Steering
• Steering Column Switches
• Sun Roof/t-Top/convertible Top
• Suspension Front
• Suspension Rear
• Testing & Diagnostics
• Timing Belt
• Traction Control Disable
• Transmission
• Warning System
• Wheel Alignment
• Wiper/washer Systems
• Wiring Diagrams - Engine Performance

Repair manual

Air Conditioning Audi A6 C5 facelift

Step-by-step instructions on "Air Conditioning" for Audi A6 C5 facelift (2001–2004). Pick an article — removal, installation, adjustment and diagnostics with illustrations.

147subsections

147articles

150illustrations

A/C system, safety precautions

1 article

• A/C system, safety precautions

A/C system, general repair guidelines

1 article

• A/C system, general repair guidelines

Commercial designation

1 article

• Commercial designation

Color

1 article

• Color

Airborne properties

1 article

• Airborne properties

Solubility of refrigerant oil

1 article

• Solubility of refrigerant oil

Effects on the environment

1 article

• Effects on the environment

Toxicity

1 article

• Toxicity

Temperature/pressure relationship

1 article

• Temperature/pressure relationship

Effects on plastics

1 article

• Effects on plastics

Effects on metal

1 article

• Effects on metal

Critical temperature/critical pressure

1 article

• Critical temperature/critical pressure

Water solubility

1 article

• Water solubility

Flammability

1 article

• Flammability

Refrigerant containers

1 article

• Refrigerant containers

Leak detection

1 article

• Leak detection

A/C refrigerant oil (PAG), properties

1 article

• A/C refrigerant oil (PAG), properties

Refrigerant system with restrictor and accumulator

1 article

• Refrigerant system with restrictor and accumulator 1

A/C compressor

1 article

• A/C compressor 1

A/C condenser

1 article

• A/C condenser 2

Evaporator

1 article

• Evaporator 1

Accumulator

1 article

• Accumulator 1

O-rings

1 article

• O-rings 1

Hoses and lines

1 article

• Hoses and lines

Pressure relief valve

1 article

• Pressure relief valve 1

A/C system, switches and valve connections

1 article

• A/C system, switches and valve connections

A/C pressure switch -F129

1 article

• A/C pressure switch -F129 1

Valve connection for pressure switch

1 article

• Valve connection for pressure switch 1

A/C compressor speed sensor -G111

1 article

• A/C compressor speed sensor -G111

A/C system, quick coupling connections

1 article

• A/C system, quick coupling connections

Connection with Schrader valve (example)

1 article

• Connection with Schrader valve (example) 1

A/C refrigerant system, pressure and temperature relationships

1 article

• A/C refrigerant system, pressure and temperature relationships 1

A/C system with restrictor and accumulator, refrigerant flow

1 article

• A/C system with restrictor and accumulator, refrigerant flow

Table of pressure and temperature relationships

1 article

• Table of pressure and temperature relationships 1

Refrigerant circuit, servicing

1 article

• Refrigerant circuit, servicing

Compressor, with A/C clutch -N25

1 article

• Compressor, with A/C clutch -N25

Compressor, with A/C compressor regulator valve -N280

1 article

• Compressor, with A/C compressor regulator valve -N280

A/C clutch -N25-, servicing (Denso compressor)

1 article

• A/C clutch -N25-, servicing (Denso compressor) 1

Loosen and tighten hex bolt

1 article

• Loosen and tighten hex bolt 1

Removing clutch plate

1 article

• Removing clutch plate 1

Installing magnetic coil

1 article

• Installing magnetic coil 3

High pressure sensor -G65-, removing and installing

1 article

• High pressure sensor -G65-, removing and installing 2

Check function

1 article

• Check function 1

O-ring seals for refrigerant circuit

1 article

• O-ring seals for refrigerant circuit 1

A/C system components (in engine compartment)

1 article

• A/C system components (in engine compartment) 2

Air extraction vent, checking

1 article

• Air extraction vent, checking 2

Dust and pollen filter element, removing and installing

1 article

• Dust and pollen filter element, removing and installing 1

Dust and pollen filter with active carbon filter element

1 article

• Dust and pollen filter with active carbon filter element

Sensor for air quality -G238-, removing and installing

1 article

• Sensor for air quality -G238-, removing and installing 1

Removing and installing

1 article

• Removing and installing 1

A/C system components (in passenger compartment)

1 article

• A/C system components (in passenger compartment) 3

A/C control head -E87-, removing and installing

1 article

• A/C control head -E87-, removing and installing

Removing and installing, Vehicles without Radio Navigation system

1 article

• Removing and installing, Vehicles without Radio Navigation system 1

Removing and installing, Vehicles with Radio Navigation system

1 article

• Removing and installing, Vehicles with Radio Navigation system 3

Control module for fresh air blower -J126-, removing and installing

1 article

• Control module for fresh air blower -J126-, removing and installing 1

Fresh air blower -V2-, removing and installing

1 article

• Fresh air blower -V2-, removing and installing 1

Sender for outlet temperature, floor outlet -G192-, removing and installing

1 article

• Sender for outlet temperature, floor outlet -G192-, removing and installing 1

Left vent temperature sensor -G150-, removing and installing

1 article

• Left vent temperature sensor -G150-, removing and installing 1

Right vent temperature sensor -G151-, removing and installing

1 article

• Right vent temperature sensor -G151-, removing and installing 1

Evaporator vent temperature sensor -G263-, removing and installing

1 article

• Evaporator vent temperature sensor -G263-, removing and installing 1

Fresh air intake duct temperature sensor -G89-, removing and installing

1 article

• Fresh air intake duct temperature sensor -G89-, removing and installing 1

Sunlight photo sensor -G107-, removing and installing

1 article

• Sunlight photo sensor -G107-, removing and installing 1

Defroster flap motor -V107-, removing and installing

1 article

• Defroster flap motor -V107-, removing and installing 1

Actuator for temperature flap right -V159-, removing and installing

1 article

• Actuator for temperature flap right -V159-, removing and installing 1

Central air flap motor -V70-, removing and installing

1 article

• Central air flap motor -V70-, removing and installing 1

Air flow flap motor -V71-, removing and installing (vehicles up to model year 2002)

1 article

• Air flow flap motor -V71-, removing and installing (vehicles up to model year 2002) 2

Recirculation flap motor -V113-, removing and installing (vehicles from model year 2002)

1 article

• Recirculation flap motor -V113-, removing and installing (vehicles from model year 2002) 1

Center instrument panel vent, removing and installing

1 article

• Center instrument panel vent, removing and installing 2

Left instrument panel vent, removing and installing

1 article

• Left instrument panel vent, removing and installing 2

Right instrument panel vent, removing and installing

1 article

• Right instrument panel vent, removing and installing 1

Left and right side window defroster vents, removing and installing

1 article

• Left and right side window defroster vents, removing and installing 1

Heater core, removing and installing

1 article

• Heater core, removing and installing 2

Removing heater core

1 article

• Removing heater core 7

Installing heater core

1 article

• Installing heater core

Changes implemented from June 1998

1 article

• Changes implemented from June 1998 6

Changes implemented from model year 2002

1 article

• Changes implemented from model year 2002

Air distribution in air conditioner

1 article

• Air distribution in air conditioner 1

Air ducts in vehicle interior

1 article

• Air ducts in vehicle interior 1

Preparatory steps

1 article

• Preparatory steps 4

Cooling performance checking (vehicles from model year 2002)

1 article

• Cooling performance checking (vehicles from model year 2002) 3

Notes

1 article

• Notes 1

Continuation for vehicles with compressor using A/C Clutch -N25

1 article

• Continuation for vehicles with compressor using A/C Clutch -N25 3

Identifying malfunctions at temperature increase behind condenser

1 article

• Identifying malfunctions at temperature increase behind condenser

Measuring pressure and temperature in a "switched-on" refrigerant system

1 article

• Measuring pressure and temperature in a "switched-on" refrigerant system

Measuring pressure and temperature in a closed container or "switched-off" refrigerant system

1 article

• Measuring pressure and temperature in a closed container or "switched-off" refrigerant system

A/C refrigerant system, checking pressures

1 article

• A/C refrigerant system, checking pressures

Preparation work

1 article

• Preparation work

Checking

1 article

• Checking

If A/C refrigerant system base pressure is less than specified on chart, system is low on refrigerant

1 article

• If A/C refrigerant system base pressure is less than specified on chart, system is low on refrigerant

If A/C refrigerant system pressure corresponds to or is higher than base pressure specified on chart

1 article

• If A/C refrigerant system pressure corresponds to or is higher than base pressure specified on chart

Pressure in A/C system corresponds to chart or is higher

1 article

• Pressure in A/C system corresponds to chart or is higher

A/C refrigerant system (R-134a), discharging

1 article

• A/C refrigerant system (R-134a), discharging

Discharging

1 article

• Discharging 1

A/C refrigerant system (R-134a), evacuating and recharging

1 article

• A/C refrigerant system (R-134a), evacuating and recharging

Evacuating and recharging

1 article

• Evacuating and recharging

A/C refrigerant system, servicing

1 article

• A/C refrigerant system, servicing

Determining dimensions of flat tubes from condenser

1 article

• Determining dimensions of flat tubes from condenser 2

Restrictor version

1 article

• Restrictor version 4

Released refrigerant oil (PAG)

1 article

• Released refrigerant oil (PAG)

Vehicles with compressors with A/C clutch -N25

1 article

• Vehicles with compressors with A/C clutch -N25 1

Refrigerant lines from Denso compressor (with A/C clutch -N25-), removing and installing

1 article

• Refrigerant lines from Denso compressor (with A/C clutch -N25-), removing and installing 1

Denso compressor, removing and installing from bracket (8 cyl. engine with A/C clutch - N25-)

1 article

• Denso compressor, removing and installing from bracket (8 cyl. engine with A/C clutch - N25-)

Removing

1 article

• Removing 2

Compressor (with A/C Clutch -N25-), removing and installing

1 article

• Compressor (with A/C Clutch -N25-), removing and installing

Vehicles with compressor drive via a belt

1 article

• Vehicles with compressor drive via a belt

Compressor (installed on right side of engine), removing and installing from bracket

1 article

• Compressor (installed on right side of engine), removing and installing from bracket 1

Compressor (installed on left side of engine), removing and installing from bracket

1 article

• Compressor (installed on left side of engine), removing and installing from bracket 2

Audi Allroad with 8 cyl. engine (compressor drive via a drive shaft)

1 article

• Audi Allroad with 8 cyl. engine (compressor drive via a drive shaft)

Belt pulley, replacing

1 article

• Belt pulley, replacing 1

Pulley, removing from compressor and installing

1 article

• Pulley, removing from compressor and installing 3

Compressor drive unit, checking, replacing

1 article

• Compressor drive unit, checking, replacing 1

Drive shaft, loosening

1 article

• Drive shaft, loosening 2

Installing

1 article

• Installing

Drive plate with overload protection, removing and installing

1 article

• Drive plate with overload protection, removing and installing 2

Drive plate to compressor, removing and installing

1 article

• Drive plate to compressor, removing and installing 3

Drive plate with roller bearing, removing and installing

1 article

• Drive plate with roller bearing, removing and installing 1

A/C refrigerant circuit, servicing (compressor with A/C compressor regulator valve -N280-)

1 article

• A/C refrigerant circuit, servicing (compressor with A/C compressor regulator valve -N280-) 1

Condenser, removing and installing

1 article

• Condenser, removing and installing

Version "1" (with bolted connection and bracket), removing

1 article

• Version "1" (with bolted connection and bracket), removing 1

Version "2" (with block and bolt connection), removing

1 article

• Version "2" (with block and bolt connection), removing 3

Version "3" (with two block connections), removing

1 article

• Version "3" (with two block connections), removing 2

Installing (all models)

1 article

• Installing (all models)

Disconnecting

1 article

• Disconnecting 1

Connecting

1 article

• Connecting 2

Refrigerant lines on compressor, disconnecting and connecting (compressor with A/C compressor regulator valve -N280-)

1 article

• Refrigerant lines on compressor, disconnecting and connecting (compressor with A/C compressor regulator valve -N280-) 2

Removing (compressor drive via belt)

1 article

• Removing (compressor drive via belt) 4

Refrigerant lines for condenser, removing and installing

1 article

• Refrigerant lines for condenser, removing and installing

Removing refrigerant lines on version "1" (two connectors)

1 article

• Removing refrigerant lines on version "1" (two connectors) 1

Removing refrigerant lines on version "2" (two block connections on left side)

1 article

• Removing refrigerant lines on version "2" (two block connections on left side) 1

Removing refrigerant lines on version "3" (one block connection on left side and one on right side)

1 article

• Removing refrigerant lines on version "3" (one block connection on left side and one on right side) 4

Removing, versions "1" and "2"

1 article

• Removing, versions "1" and "2" 1

Removing, version "3"

1 article

• Removing, version "3" 5

Condenser version

1 article

• Condenser version 2

Air conditioner unit

1 article

• Air conditioner unit 1

Refrigerant oil

1 article

• Refrigerant oil

Compressor bracket, removing and installing (6 cyl. engine, compressor with A/C clutch -N25-)

1 article

• Compressor bracket, removing and installing (6 cyl. engine, compressor with A/C clutch -N25-) 1

Complete air conditioner unit, removing and installing

1 article

• Complete air conditioner unit, removing and installing 4

Air duct and intake housing (vehicles up to model year 2001)

1 article

• Air duct and intake housing (vehicles up to model year 2001) 1

Air duct and intake housing (vehicles from model year 2002)

1 article

• Air duct and intake housing (vehicles from model year 2002) 1

A/C does not cool (cooling has stopped completely)

1 article

• A/C does not cool (cooling has stopped completely)

Insufficient cooling during all driving or engine speed (RPM)

1 article

• Insufficient cooling during all driving or engine speed (RPM)

A/C compressor noisy

1 article

• A/C compressor noisy

A/C compressor noisy immediately after switching A/C ON and/or when driving around corners or braking "refrigerant shock" - refrigerant system overcharged

1 article

• A/C compressor noisy immediately after switching A/C ON and/or when driving around corners or braking "refrigerant shock" - refrigerant system overcharged

With an otherwise properly operating A/C system, water sprays out of instrument panel vents

1 article

• With an otherwise properly operating A/C system, water sprays out of instrument panel vents

A/C system, replacing components

1 article

• A/C system, replacing components

For leaking or damaged components (except for compressor and accumulator), A/C system was completely empty (no charge)

1 article

• For leaking or damaged components (except for compressor and accumulator), A/C system was completely empty (no charge)

For leaky or damaged components (except for the compressor and accumulator) there is still refrigerant in the A/C system

1 article

• For leaky or damaged components (except for the compressor and accumulator) there is still refrigerant in the A/C system