Audi A4 2001 - Connecting for Measuring and Testing, One Service Connection

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– Connect service station via service connections with quick-re‐
lease coupling adapters to vehicle refrigerant circuit.
– Screw in handwheel of quick-release coupling adapters only
until valves are definitely open at refrigerant circuit connection
(observe pressure gauge, do not strain valves).
– Perform planned tests and measurements.
2.4.5 Connecting for Measuring and Testing,
One Service Connection
Special tools and workshop equipment required
♦ Valve Adapters -V.A.G 1785/9-
♦ -V.A.G 1785/10- or Air Conditioning Adapter Set -V.A.G 1786-
• Work procedure may vary depending on the type of tools se‐
lected (the tool-specific operating instructions should therefore
be followed).
Note
The work procedure is always to be performed as described in
the operating instructions for the A/C service station.
The charging hoses are to be connected as follows to prevent the
entry of air or moisture into the refrigerant circuit:
– Switch off the ignition.
– Connect service station to power supply.
– Remove the caps from the service connections or connections
with valve (refer to vehicle-specific refrigerant circuit). Refer to
⇒ Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ;
Removal and Installation (vehicle-specific repair manual).
– Evacuate charging hoses if necessary.
– Connect quick-release coupling to service connection of re‐
frigerant circuit.
WARNING
♦ Never open valves on low or high-pressure side with en‐
gine running. Otherwise, compressor or service station
could be destroyed by a short circuit between high and
low-pressure sides of refrigerant circuit if air conditioning
system is switched on.
– Only tighten the handwheel in the quick-release coupling just
enough so the service connection is open. Watch the pressure
gauge and do not place too much pressure on the valve.
– Start the engine and perform the planned tests and measure‐
ments.
– Compare values determined to specified measured values.
Refer to ⇒ “4.4 Pressures, Checking“, page 153 .
– Before disconnecting quick-release coupling, close it by
screwing out handwheel.
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