Audi A4 2001 - Brake Fluid Reservoir and Light Switch

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Note
♦ For the most part, blowing through the refrigerant circuit with
compressed air and nitrogen requires significantly more work
than flushing with refrigerant R134a. As flushing with refriger‐
ant R134a cleans the components more efficiently, always
flush in case of a complaint (blowing through should only be
used for certain complaints and individual components).
♦ Under certain conditions it may be sufficient to blow through
certain components (such as individual refrigerant lines or re‐
frigerant hoses) with compressed air and nitrogen ( for purpo‐
ses of forcing out old refrigerant oil from individual components
that were removed).
♦ Certain contaminants cannot or can only be insufficiently re‐
moved from the refrigerant circuit with compressed air, these
contaminants can be removed, for example by flushing with
refrigerant R134a. Refer to
⇒ “1.4.13 Refrigerant Circuit Flushing With Refrigerant
R134a“, page 32 .
♦ When blowing through, the maximum work pressure of 15 bar
must not be exceeded (corresponding to pressure that is
reached in a filled refrigerant circuit with an ambient temper‐
ature of approximately 60° C, if necessary use pressure re‐
ducer also for compressed air).
WARNING
♦ Nitrogen can leak uncontrolled from the cylinder.
♦ Make exclusive use of pressure reducers for nitrogen cyl‐
inders (maximum work pressure 15 bar).
♦ Use appropriate extraction units to draw off gas mixture
escaping from components.
– Always flush components in direction opposite to refrigerant
flow.
Note
Restrictor, expansion valve, compressor, receiver and reservoir
cannot be flushed with compressed air and nitrogen.
– Remove dryer cartridge on condensers with dryer.
Note
♦ If the reservoir / dryer cartridge is integrated in the condenser,
then they cannot be replaced individually and the condenser
must be replaced.
♦ Reservoirs, where it is possible to replace the dryer cartridge,
have an additional filter, which must also be replaced with the
dryer cartridge.
– First flush out old refrigerant oil and dirt using compressed air
and then use nitrogen to remove component moisture.
– Adapter for sealing off the pressure hose to the refrigerant cir‐
cuit, refer to ⇒ “2.4 A/C Service Station“, page 79 .
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
30 Rep. Gr.00 - General, Technical Data