Audi A4: A/C System, General Information
Audi A4 (B9) 2016-2025 Service Manual / Heating, Ventilation & Air Conditioning / A/C System, General Information
- Introduction
- A/C Technology Basic Principles
- Refrigerant R134a
- Refrigerant R134a Characteristics
- Refrigerant Oil
- A/C System Operation
- General Safety Precautions
- A/C System and Refrigerant R134a Safety Precautions
- Refrigerant Circuit, General Precautions
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Introduction
The purpose of this repair manual is to provide service
advisors and technicians with the basic knowledge needed to
ensure professional and competent procedures.
Note
Only the careful study
A/C Technology Basic Principles
Physical Principles
The four known states of water also apply to air
conditioning system refrigerants.
1 - Gaseous (invisible)
2 - Vapor
3 - Liquid
4 - Solid
Refrigerant R134a
Refrigerant R134a Physical Data
Vehicle air conditioning systems make use of the
vaporization and condensation process. In this case, one works
with a substance which boils easily, designated as ref
SEE MORE:
Door Handle, Removing and Installing
Removing
- Remove the door handle trim. Refer to
→ Chapter "Door Handle Trim, Removing and Installing".
- Equipped on some models: Remove the exterior door handle
illumination bulb. Refer to
→ Electrical Equipment; Rep. Gr.94; Exterior Door Handle Lamps;
Exterio
Instrument Panel Central Tube
Overview - Instrument Panel Central Tube
1 - Bolt
20 Nm
Quantity: 2
The mounting threads and contact surface must be free of paint, coating,
and corrosion. The threaded connection serves as the ground connection
2 - Threaded Pin
20 Nm
Quantity: 2
3 - Lifter
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