Audi A4: Refrigerant Circuit, Determining Leaks
Audi A4 (B9) 2016-2024 Service Manual / Heating, Ventilation & Air Conditioning / Refrigerant Circuit / Refrigerant Circuit, Determining Leaks
- General Information
- Refrigerant Circuit, Tracing Leaks Using Electronic Leak Detector
- Leak Detection on Refrigerant Circuit Using Leak Detection Kit -VAS6201A-
- Finding Leaks via Vacuum Test using A/C Service Station or Nitrogen Pressure Testing
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General Information
Vehicles with a High Voltage System (Hybrid Vehicles)
Extremely Dangerous Due to High-Voltage
The high-voltage system is under high-voltage. Death or serious
bodily injury by electric shock.
- I
Refrigerant Circuit, Tracing Leaks Using Electronic Leak Detector
Vehicles with a High Voltage System (Hybrid Vehicles)
Read and follow all of the supplemental warnings for all
work performed on vehicles with the high voltage system. Refer
to
→ Chapter "Wa
Leak Detection on Refrigerant Circuit Using Leak Detection Kit -VAS6201A-
Vehicles with a High Voltage System (Hybrid Vehicles)
Read and follow all of the supplemental warnings for all
work performed on vehicles with the high voltage system. Refer
to
→ Chapter "Wa
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Luggage compartment
lid
General information
WARNING
Applies to: vehicles with anti-theft alarm
system: When the vehicle is locked from the
outside, no one, especially children, should
remain in the vehicle, because the windows
can no longer open from the inside. Locked doors make it more difficult
for emergency work
Coolant System/Coolant
Connection Diagram - Coolant Hoses
Connection Diagram - Coolant Hoses, Versions without Parking Heater
Note
Blue = large coolant circuit.
Red = small coolant circuit.
Brown = heating circuit.
Green = coolant circuit for the transmission.
The arrows show the coolant flow direction.
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