Audi A4 2001 - Single-Stage ABS Return Pump Function

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Note
♦
♦ There are different quick-release coupling versions -A- and
-D-. The refrigerant lines -C- can unlocked and removed, for
example, using the release tool -T40149/1- in the same man‐
ner with both versions.
♦ The check pins on the -B-quick-release couplings -A- installed
at Start Of Production are visible -C-, when the locked refrig‐
erant line -C- is pulled in the direction of arrow.
♦ Beginning with MY 2010, as a running change, the quick-re‐
lease coupling -D- installed and the refrigerant line -C- are
being installed in the same manner as the quick-release cou‐
pling -A-. If the refrigerant line -C- is pulled in the direction of
arrow after assembling, the ring -E- will come out of the quick-
release coupling -D- and will show that the retaining ring -F- is
completely latched to the refrigerant line -C-. Then the ring
-E- can be removed from the refrigerant line -C-.
1.4.6 Refrigerant Circuit Connections with
Valve for Switches
• Different threads for switch on high pressure and low pressure
sides.
• Only valves and O-ring seals that are resistant to refrigerant
R134a and refrigerant oil must be installed.
A - Connection (soldered in)
B - O-ring seal
C - Valve (with O-ring seal)
Note
For removing and installing the valve set -B- when the refrigerant
circuit is evacuated, for example, use an adapter from the Socket
for A/C valves -T10364- . For the correct tightening specification,
refer to ⇒ “2.1.4 Connections with Schrader Valve“, page 58 .
1.4.7 Refrigerant Circuit Pipes and Hoses
The mixture of refrigerant oil and refrigerant R134a corrodes cer‐
tain metals (such as copper) and alloys and dissolves some hose
materials. Therefore use original replacement parts only.
Pipes and hoses are joined by threaded connections or special
plug connectors.
Note
Observe specified torque for threaded connections, use appro‐
priate release tools for plug connectors.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
26 Rep. Gr.00 - General, Technical Data