Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A1 Sportback 2 ...
Air conditioner with refrigerant R134a - Edition 11.2018
Note
♦ The replacement compressor contains a certain amount of re‐
3
frigerant oil (currently 130 +/ - 10 cm depending on the air
conditioner compressor, refer to label). This quantity of refrig‐
erant oil currently corresponds to the quantity of oil specified
for this refrigerant circuit on vehicles with one or two evapo‐
rators (except vehicles with 8-cyl. TDI engine; for these vehi‐
cles see below). At present, the same amount of oil is used in
vehicles with two evaporators as in vehicles with one evapo‐
rator. Due to the longer refrigerant lines and the second evap‐
orator, no additional refrigerant oil is currently required in the
refrigerant circuit on this vehicle. The refrigerant circuit on this
vehicle is constructed so that only a small part of the refrigerant
oil passes through the refrigerant lines to the second evapo‐
rator and into the second evaporator when the air conditioner
is operated. If the air conditioner compressor is renewed after
cleaning the refrigerant circuit, it is therefore not necessary to
pour additional refrigerant oil into the refrigerant circuit on ve‐
hicles with two evaporators (due to the second evaporator). If
the air conditioner compressor is renewed without having to
clean the refrigerant circuit, the quantity of refrigerant oil in the
new compressor to be fitted should be adjusted in line with the
quantity of oil poured out of the old compressor ⇒ page 272 .
♦ On vehicles with 8-cyl. TDI engine, the quantity of refrigerant
oil in the refrigerant circuit was increased from 130 ccm to
180 ccm from vehicle identification number 4H_ BN 018846
onwards. Accordingly, the refrigerant capacity thus had to be
reduced slightly. As the capacity specification on the label has
not yet been changed, proceed as follows: On vehicles man‐
ufactured up to the vehicle identification number mentioned,
check whether the refrigerant oil has already been topped up
during a previous workshop visit. If not, add 50 ccm of refrig‐
erant oil to the refrigerant circuit. Then correspondingly alter
the refrigerant capacity specified on the label in waterproof ink
and fill the refrigerant circuit with the specified quantity of re‐
frigerant. Finally make a record of the change made in the
vehicle data. On vehicles manufactured as of the vehicle iden‐
tification number mentioned, check the refrigerant capacity
specified on the label, alter accordingly in waterproof ink if ap‐
plicable and then fill the refrigerant circuit with the specified
quantity of refrigerant.
♦ Vehicles with an 8-cyl. TDI engine up to vehicle identification
number 4H_ BN 018845 were filled at the factory with the same
quantity of refrigerant oil as for the other engines. As of vehicle
identification number 4H_ 018846, the refrigerant circuit on
vehicles with an 8-cyl. TDI engine is filled at the factory with a
larger quantity of refrigerant oil. This quantity of refrigerant oil
applies retroactively to all vehicles with an 8-cyl. TDI engine.
If the refrigerant circuit is re-charged on vehicles with an 8-cyl.
TDI engine or the air conditioner compressor is renewed, e.g.
after cleaning the refrigerant circuit, the quantity of refrigerant
oil in the refrigerant circuit must be checked and topped up if
necessary, or the correct quantity must be added (e.g. at open
lines or component connections or via air conditioner service
station prior to filling with refrigerant). If the air conditioner
compressor is renewed without having to clean the refrigerant
circuit, the quantity of refrigerant oil in the new compressor to
be fitted should be adjusted in line with the quantity of oil pour‐
ed out of the old compressor (and topped up accordingly if
necessary on vehicles up to the vehicle identification number
specified above) ⇒ page 272 .
10. Capacities for refrigerant R134a/refrigerant oil and approved refrigerant oils
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