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
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Differential
Overview - Differential
1 - Left Flange Shaft Seal
Replacing. Refer to
→ Chapter "Left Seal, Replacing".
2 - Shim
Behind the taper roller bearing outer race
3 - Taper Roller Bearing Outer Race
4 - Front Differential
5 - Bolt
Tighteni
Head-up display
Description
Applies to: vehicles with head-up display
Fig. 19 Instrument panel: knob for the head-up display
The head-up display projects certain warnings or
selected information from the assist systems on
the windshield. The display appears within the
driver's field of vision.
Switching on and off
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