Audi A8 1994 - Draining Service Station

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with respect to the correctness of information in this document. Copyright by AUDI AG.
Ventilation and Air Conditioning; Rep. Gr. 87 ; General Infor‐
mation (vehicle-specific repair manual).
Note
♦ There is a possibility of refrigerant oil being extracted from the
refrigerant circuit together with the refrigerant. To ensure com‐
pressor lubrication, the refrigerant oil in the circuit must be
topped up with fresh oil. Refer to
⇒ “3.4 Refrigerant Oil Capacities“, page 119 .
♦ On vehicles fitted with a compressor with no A/C clutch (with
A/C compressor regulator valve -N280- ) the engine should
not be run for longer than absolutely necessary with the re‐
frigerant circuit empty (A/C compressor always in operation as
well).
♦ On vehicles with a compressor with no A/C clutch, the engine
is only to be started following complete assembly of the re‐
frigerant circuit (avoid high engine speeds).
♦ Depending on the A/C compressor version, there may be a
valve installed on the high pressure side of the A/C compres‐
sor, which prevents the liquid refrigerant from flowing back into
the compressor once the A/C is turned off. If an A/C compres‐
sor with this valve is installed in a vehicle with a refrigerant
circuit having an expansion valve, then it may take some time
until the pressure in the high pressure side decreases (the ex‐
pansion is cold and the pressure in the low pressure side
quickly increases after it is turned off, the expansion valve
closes and the refrigerant flows slowly into the low pressure
side). If the A/C compressor is switched on (or the refrigerant
circuit is evacuated on the low pressure side) the pressure on
the low pressure side goes down, the expansion valve open
and the refrigerant can flow of the low pressure side.
2.4.10 Draining Service Station
Note
♦ If it is necessary to drain the service station (for example, due
to extraction of contaminated refrigerant), all filters and dryers
must always be replaced (do not remove filter and dryer from
the air-tight packaging until immediately before installation to
minimize moisture absorption).
♦ Refrigerant containers filled with contaminated used refriger‐
ant are referred to as “Recycling containers“.
♦ Always evacuate recycling containers prior to initial filling with
refrigerant (if there is air in a refrigerant container it is not to
be filled with refrigerant).
♦ Different types of refrigerant are not to be mixed (refrigerant
mixtures cannot be recycled and are to be disposed of). If there
is any doubt about the composition of the contents of the con‐
tainer, the refrigerant recycling company is to be informed
accordingly.
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