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 MANUALSAUDI2013A4 PRESTIGE QUATTRO, ENG CD CPMA, AUTOMATIC TRANSREPAIR AND DIAGNOSISHEATING, VENTILATION & A/C (HVAC)GENERAL SERVICINGREFRIGERANT R134A SERVICING (1 OF 2) (SEDAN)
2013 Audi A4 Prestige Quattro, Eng CD CPMA, Automatic Trans
Refrigerant R134A Servicing (1 Of 2) (Sedan)
2013 Audi A4 Prestige Quattro, Eng CD CPMA, Automatic TransSECTION Refrigerant R134A Servicing (1 Of 2) (Sedan)
- 87 Air Conditioning
- Warnings When Working On Vehicles With High Voltage System
- A/C System, General Information
- Introduction
- Safety Precautions For Vehicles With Start/Stop System
- Additional Information Sources
- A/C Technology Basic Principles
- Refrigerant R134A
- Refrigerant R134A Characteristics
- Refrigerant Oil
- A/C System Operation
- General Safety Precautions
- Product Characteristics
- Handling Refrigerant
- Handling Pressure Containers
- Extraction And Charging System Safety Regulations
- A/C System And Refrigerant R134A Safety Precautions
- Refrigerant Circuit, General Precautions
- After Charging A/C System
- Refrigerant Circuit General Information
- Vehicles With A High Voltage System (Hybrid Vehicles)
- Refrigerant Circuit Components
- Refrigerant Circuit Components Allocation, High And Low Pressure Sides
- General Information
- Mechanically Driven A/C Compressor:
- Electrically Driven A/C Compressor For Vehicles With High Voltage System
- Condenser
- Evaporator
- Reservoir
- RESTRICTOR
- Receiver/Dryer
- Expansion Valve
- EXPANSION VALVE WITH Hybrid Battery Refrigerant Shut-Off Valve 2 -N517-
- Refrigerant Cut-Off Valve
- Refrigerant Line With Inner Heat EXCHANGER
- Quick-Release Connections On Refrigerant Lines
- O-Ring Seals
- Refrigerant Circuit Pipes And Hoses
- Pressure Relief Valve
- Refrigerant Circuit
- Refrigerant Circuit With An Electrically Driven A/C Compressor (With And Without Battery Cooling Module)
- Connections For Quick-Release Coupling On Refrigerant Circuit
- Switches And Sensors On Refrigerant Circuit And Connections
- A/C Refrigerant High Pressure Switch -F23-
- Magnetic Clutch High Pressure Switch -F118-
- A/C Refrigerant Low Pressure Switch -F73-
- Refrigerant Circuit Connections With Valve For Switches
- A/C Pressure Switch -F129-
- High Pressure Sensor -G65-, Refrigerant Circuit Pressure Sensor -G805-
- A/C Pressure/Temperature Sensor -G395-
- A/C Compressor Regulator Valve -N280-
- A/C Compressor -G111-
- Refrigerant Temperature Sensor -G454-
- Electrical Components Not On Refrigerant Circuit
- Refrigerant Circuit Pressures And Temperatures
- Pressure Gauge, Tests And Measurements
- Service And Recycling Units
- Refrigerant Circuit Repair Information
- Laws And Regulations
- Refrigerant Circuit
- A/C System Repair Information
- Refrigerant Circuit, Converting R12 To R134A
- Using Service Station
- General Information
- Service Station, Important Usage Information
- Servicing Station, Connecting For Measuring And Testing
- Refrigerant Circuit, Discharging With Service Station
- Refrigerant Circuit, Charging With Service Station
- A/C System, Operating After Charging
- Refrigerant To Service Station Reservoir (Charging Cylinder Or Reservoir Bottle), Transferring
- Service Station, Draining
- Refrigerant Circuit, Flushing With Compressed Air And Nitrogen
- Refrigerant Circuit, Cleaning (Flushing), With Refrigerant R134A
- Refrigerant Circuit, Determining Leaks
- Refrigerant Circuit Complaints
- A/C Service Station, Connecting
- Pressures, Checking
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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.