Note
♦
The replacement compressor is already filled with a specific
refrigerant oil quantity (currently 130 or 150
+
/ - 10 cm
3
, de‐
pending on the compressor), this refrigerant oil quantity cor‐
responds to the oil quantity designated for this refrigerant
circuit on vehicles with one evaporator. Vehicles with two
evaporators have the same oil capacity as vehicles having just
one evaporator. Due to the longer refrigerant pipes and the
second evaporator, this vehicle does not require more refrig‐
erant inside the refrigerant circuit. The refrigerant circuit in this
vehicle is designed so that a smaller portion of the refrigerant
oil gets into the refrigerant pipes leading to the second evap‐
orator when the A/C is being used. If the compressor is re‐
placed after cleaning the refrigerant circuit, this refrigerant oil
quantity must therefore be added to the refrigerant circuit in
vehicles with two evaporators. If compressor is replaced with‐
out having to clean the refrigerant circuit, the refrigerant oil
quantity in the new compressor to be installed must be adjus‐
ted to the oil quantity poured out of the old compressor. Refer
to
⇒ “5 Removal and Installation“, page 191 .
♦
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.
♦
These A/C compressors are available as replacement parts
with different oil fill capacities, therefore note capacity on the
A/C compressor and the exact part number. Refer to the Elec‐
tronic Parts Catalog.
♦
Too much oil in the circuit leads to higher pressures and re‐
duces cooling performance of the A/C system. Too little oil
may lead to lubrication problems in the compressor, therefore
note the specified refrigerant oil quantities.
♦
A data plate may be attached to the A/C compressor by the
manufacturer, indicating the part number and refrigerant oil
quantity.
3.4.18 Capacities, Audi Q7 (4L_), from MY 06
Features of the refrigerant system:
• Expansion Valve
• Depending on the vehicle equipment level with one or two
evaporators
• Dryer cartridge in fluid reservoir on condenser
• Denso A/C compressors with an A/C compressor regulator
valve -N280- , refer to ⇒ Heating, Ventilation and Air Condi‐
tioning; Rep. Gr. 87 ; Description and Operation (vehicle-
specific repair manual) and to the Electronic Parts Catalog.
Vehicle
model
Pro‐
duction
period
Total quanti‐
ty of oil in re‐
frigerant cir‐
cuit in cm
3
Quantity of
refrigerant oil
in replace‐
ment com‐
pressor in
cm
3
Differing fea‐
tures of this
refrigerant
circuit
Audi Q7 As of
02.06
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
138 Rep. Gr.00 - General, Technical Data
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