Audi A8 1994 - Page 140

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Vehicle model Production
period
Total quantity of oil in
refrigerant circuit in
cm
3
Quantity of refrigerant
oil in replacement
compressor in cm
3
Differing features of this
refrigerant circuit
• 6, 10 and 12
cylinder Gaso‐
line engine
• 6 and 8 cylinder
diesel engine
• 8-cylinder 4.2L
gasoline en‐
gine (only FSI)
As of 01.04
150
+
/
-
10 150
+
/
-
10
Note
♦ The replacement compressor contains the full quantity of oil
intended for the refrigerant circuit. On A/C compressor re‐
placement, the quantity of oil in the A/C compressor is there‐
fore to be adjusted. Refer to
⇒ “5 Removal and Installation“, page 191 .
♦ The Audi A8 is equipped with different A/C compressors de‐
pending on engine and production period.
♦ The replacement part for this A/C compressor has different oil
capacities. Pay close attention to the exact part number. Refer
to ⇒ Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ;
Removal and Installation (vehicle-specific repair manual) and
to the Electronic Parts Catalog.
♦ At start of production, the compressor types in the first two
lines of the table were supplied with a refrigerant oil quantity
of 200 cm
3
. These compressors can be recognized from the
index of the part number (4E0 260 805 with index C,D, E, F,
J, L or S). In model year 2004 (as of approximately 01.04), a
gradual change was made to other types of compressor with
a refrigerant oil quantity of 150 cm
3
. These compressors can
be recognized from the index of the part number (4E0 260 805
with the index G, H, T, M, N, Q, or double index, for example,
AB). Refer to Electronic Parts Catalog (ETKA).
♦ The reason for the different oil capacities inside the A/C com‐
pressor is due to the design of the A/C compressor (with or
with an oil separator on the high pressure connection) or to the
design of the refrigerant circuit if the A/C compressors are
have the identical design. Pay attention to the different ca‐
pacities. Too much oil in the circuit leads to higher pressures
and reduces cooling performance of the system. Too little oil
may lead to lubrication problems in the compressor.
♦ A data plate may be attached to the A/C compressor by the
manufacturer, indicating the part number and refrigerant oil
quantity.
3.4.17 Capacities, Audi A8 (4H_) from MY 10
Features of the refrigerant system:
• Expansion Valve
• Depending on the vehicle equipment level with one or two
evaporators
• Refrigerant pipe with inner heat exchanger.
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