Audi A4 2001 - Aerodynamics, Safety, and Infotainment

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00 – General, Technical Data
1 General Information
⇒ “1.1 A/C System“, page 1
⇒ “1.2 Laws and Regulations“, page 12
⇒ “1.3 A/C System Principles“, page 18
⇒ “1.4 Refrigerant Circuit and Components“, page 21
1.1 A/C System
⇒ “1.1.1 Refrigerant R134a“, page 1
⇒ “1.1.2 Refrigerant R134a Characteristics“, page 2
⇒ “1.1.3 Refrigerant R134a Vapor Pressure Table“, page 4
⇒ “1.1.4 Handling Refrigerant“, page 5
⇒ “1.1.5 Refrigerant Oil“, page 7
⇒ “1.1.6 Refrigerant Oil Characteristics“, page 7
⇒ “1.1.7 Safety Precautions“, page 8
⇒ “1.1.8 Safety Precautions for Working with Extraction and
Charging System“, page 9
⇒ “1.1.9 Handling Pressure Vessels“, page 9
⇒ “1.1.10 Service and Recycling Units“, page 10
⇒ “1.1.11 Vehicles with A/C Compressor Without A/C Clutch, Only
with A/C Compressor Regulator Valve“, page 10
⇒ “1.1.12 Repairing A/C System“, page 10
1.1.1 Refrigerant R134a
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 refrigerant.
The refrigerant employed is tetrafluoroethane R134a, which boils
at - 26.5° C at a vapor pressure of 1 bar.
Refrigerant R134a Environmental Information
♦ R134a is a fluorocarbon and contains no chlorine.
♦ R134a has a shorter atmospheric life span than refrigerant
R12.
♦ R134a does not damage the ozone layer. The ozone depletion
potential is zero.
♦ The greenhouse potential of R134a (Global Warming Potential
= GWP) is approximately 1300 (the GWP of carbon dioxide =
1).
♦ The global warming effect of R134a is “ten“ times less than
that of refrigerant R12.
Vehicles manufactured after 1992 have air conditioning systems
that use refrigerant R134a. This refrigerant does not contain
chlorine and does not deplete the ozone layer.
Refrigerant R12 was used through 1992. Due to its chlorine
atoms, this CFC has a high potential for depleting the ozone layer
as well as a tendency to increase the greenhouse effect.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
1. General Information 1