Section 118 (Air Conditioning)
WARNING: This page is about a different car, the 2004 Audi S4, 2004 Audi A4, 2003 Audi A4, and 2002 Audi A4. However, it is still accessible from the selected car via links, so may be relevant.
- Safety precautions
- A/C system, general repair guidelines
- Refrigerant system, servicing
- Compressor, removing and installing from bracket
- Belt pulley/drive unit of compressor, replacing
- Belt pulley (version 1), replacing
- Pulley, removing from compressor and re-installing (version 1)
- Belt pulley (version 2), replacing
- Pulley, removing from compressor and re-installing (version "2")
- Compressor drive unit, checking, replacing
- Compressor drive shaft, loosening and tightening
- Compressor drive shaft, removing and installing
- Drive plate with overload protection, removing and installing
- Run-out of drive plate with overload protection, checking and adjusting
- Drive plate to compressor, removing and installing
- Drive plate with roller bearing, removing and installing
- A/C system control and regulation components
- Notes
- Components in engine compartment and rear of vehicle
- Dust and pollen filter element, removing and installing
- Dust and pollen filter with active-carbon-filter element
- Sensor for air quality -G238-, removing and installing
- Air extraction vent, checking
- Components in passenger compartment
- A/C control head -E87-, removing and installing
- Air guide connection for glove compartment cooling, removing and installing
- Control module for fresh air blower -J126- and Fresh Air Blower -V2-, removing and installing
- Left Vent Temperature Sensor -G150-, removing and installing
- Right Vent Temperature Sensor -G151-, removing and installing
- Evaporator Vent Temperature Sensor -G263-, removing and installing
- Left Footwell Vent Temperature Sensor -G261-, removing and installing
- Right Footwell Vent Temperature Sensor - G262-, removing and installing
- Sunlight Photo Sensor -G107-, removing and installing
- Evaporator housing drain, removing and installing
- Evaporator housing drain, checking
- Adapter cable, modifying to activate positioning motors
- Defroster flap motor -V107-, removing and installing
- Actuator for temperature flap right -V159-, removing and installing
- Actuator for temperature flap left -V158-, removing and installing
- Central Air Flap Motor -V70-, removing and installing
- Recirculation Flap Motor -V113-, removing and installing
- Air Flow Flap Motor -V71-, removing and installing
- Fresh Air Intake Duct Temperature Sensor -G89-, removing and installing
- Heater core, removing and installing
- Instrument panel vents and air ducts
- A/C refrigerant system, testing
- A/C refrigerant system cooling performance, testing
- Special tools and equipment
- Test requirements:
- Checking
- Identifying malfunctions if specified values are not obtained
- Notes
- Identifying malfunctions at temperature increase behind condenser
- A/C refrigerant system, leak testing
- A/C refrigerant system, testing with pressure gauges
- A/C refrigerant system, checking pressures
- Notes
- Test requirements
- Preparation work
- Checking
- 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:
- Pressure in A/C system corresponds to chart or is higher:
- A/C refrigerant system (R-134a), discharging
- A/C refrigerant system (R-134a), evacuating and recharging
- A/C refrigerant system (R-134a), flushing with compressed air and nitrogen
- A/C refrigerant system cooling performance, testing
- A/C refrigerant system, servicing
- Compressor, removing and installing
- Refrigerant lines on compressor, removing and installing
- Compressor, removing and installing (for vehicles with a 4 or 6 cyl. engine)
- Compressor, removing and installing (vehicles with 8 cyl. engine)
- A/C system, running after installing compressor
- Refrigerant lines on evaporator flange, removing and installing
- Refrigerant lines for condenser, removing and installing
- Condenser, removing and installing
- Restrictor, removing and installing
- Accumulator, removing and installing
- A/C refrigerant system, capacities
- Heating and A/C unit, component overview
- A/C system, troubleshooting
- Test requirements
- A/C does not cool (cooling has stopped completely)
- Insufficient cooling during all driving or engine speed (RPM)
- 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:
- With an otherwise properly operating A/C system, water sprays out of instrument panel vents:
- A/C system, replacing components
- Notes
- 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:
- Replace compressor, without it being necessary to blow through the refrigerant system with compressed air and nitrogen (e.g. exterior damage after an accident):
- Replace compressor due to leaks or interior damage (e.g. noises or no power):
- Replace accumulator and restrictor after blowing through the A/C system e.g. caused by penetrating moisture (the A/C system was open over a long period of time) or contamination (dirt):
- Replace accumulator, without it being necessary to blow through A/C system with compressed air and nitrogen (e.g. damage caused by an accident), no refrigerant flowed out and no moisture and dirt have penetrated the circuit: