Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
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HOMESERVICE MANUALSAUDI1996A4 BASE, STANDARDREPAIR AND DIAGNOSIS (SINGLE PAGE)EXTERNAL PAGESDIFFERENT CARSECTION 81 (AIR CONDITIONING)
1996 Audi A4 Base, Standard
Section 81 (Air Conditioning)
1996 Audi A4 Base, StandardSECTION Section 81 (Air Conditioning)
WARNING: This page does not describe the selected car, but rather 15 other vehicles, including the 2005 Audi allroad, 2004 Audi allroad, 2004 Audi A6, 2003 Audi allroad, and 2003 Audi S6. However, it is still accessible from the selected car via links, so may be relevant.
- A/C system, safety precautions
- A/C system, general repair guidelines
- A/C system, overview
- Refrigerant circuit, servicing
- A/C system components (in engine compartment)
- A/C system components (in passenger compartment)
- Notes
- A/C control head -E87-, removing and installing
- Control module for fresh air blower -J126-, removing and installing
- Fresh air blower -V2-, removing and installing
- Sender for outlet temperature, floor outlet -G192-, 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
- Fresh air intake duct temperature sensor -G89-, removing and installing
- Sunlight photo sensor -G107-, removing and installing
- Defroster flap motor -V107-, removing and installing
- Actuator for temperature flap left -V158-, removing and installing
- Actuator for temperature flap right -V159-, removing and installing
- Central air flap motor -V70-, removing and installing
- Air flow flap motor -V71-, removing and installing (vehicles up to model year 2002)
- Recirculation flap motor -V113-, removing and installing (vehicles from model year 2002)
- Instrument panel vent removal tool, making
- Center instrument panel vent, removing and installing
- Left instrument panel vent, removing and installing
- Windshield defroster vent, removing and installing
- Right instrument panel vent, removing and installing
- Left and right side window defroster vents, removing and installing
- Heater core, removing and installing
- Air conditioning changes
- Air distribution in air conditioner and body
- A/C system cooling performance, testing
- A/C system, checking and testing
- A/C refrigerant system, leak testing
- A/C refrigerant system, testing with pressure gauges
- A/C refrigerant system, checking pressures
- 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, servicing
- Notes
- A/C refrigerant R-134a and refrigerant oil (PAG), capacities
- Vehicles with compressors with A/C clutch -N25-
- Refrigerant lines from Denso compressor (with A/C clutch -N25-), removing and installing
- Denso compressor, removing and installing from bracket (8 cyl. engine with A/C clutch - N25-)
- Compressor (with A/C Clutch -N25-), removing and installing
- Compressor with A/C compressor regulator valve -N280-, removing and installing from bracket
- Compressor belt pulley/ drive unit, replacing (compressor without A/C clutch)
- Belt pulley, replacing
- Pulley, removing from compressor and installing
- 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 refrigerant circuit, servicing (compressor with A/C compressor regulator valve -N280-)
- Condenser, removing and installing
- Refrigerant lines on evaporator, disconnecting and connecting
- Restrictor, removing and installing
- Refrigerant lines on compressor, disconnecting and connecting (compressor with A/C compressor regulator valve -N280-)
- Compressor (with A/C Compressor regulator valve -N280-), removing and installing (in a vehicles with 6 cyl. engine)
- A/C system, running after installation of compressor
- Compressor for Audi Allroad with 8 cyl. engine, removing and installing
- Refrigerant lines for condenser, removing and installing
- Refrigerant lines for condenser with block connection, removing and installing
- Catch reservoir (Accumulator), removing and installing
- Capacities
- Compressor bracket, removing and installing (6 cyl. engine, compressor with A/C clutch -N25-)
- Complete air conditioner unit, removing and installing
- A/C unit, disassembling and assembling
- Air distribution housing, disassembling and assembling
- Air duct with intake housing, disassembling and assembling
- A/C system, troubleshooting
- 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:
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.