Audi Q7 2007 Repair Manual page 19

1 - A/C Compressor Regulator
Valve - N280-
❑ Checking activation and
function. Refer to
⇒ "3.8 A/C Compressor
Regulator Valve N280 ,
Checking Activation
Signal", page 30
Note
Certain functions on the A/C
♦
compressor regulator valve -
N280- (for example, a stuck
valve or a disruption in the coil)
can lead to a complaint regard‐
ing the A/C compressor (A/C
system doesn't cool, the evapo‐
rator ices over, etc.). If the cause
is with the A/C compressor reg‐
ulator valve -N280- (and not the
A/C compressor itself), the A/C
compressor can be serviced by
replacing the valve -N280- . Re‐
fer to ⇒ Refrigerant R134a Serv‐
icing; Rep. Gr. 87 ; A/C System
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
General Information (Refrigerant
with respect to the correctness of information in this document. Copyright by AUDI AG.
R134a, Servicing; Refrigerant
Circuit Components, Replacing).
The A/C compressor regulator
♦
valve -N280- is not available as
a replacement part for all A/C
compressors. If the A/C com‐
pressor regulator valve -N280- is
not available as an individual A/
C compressor part (different ver‐
sions), then the entire A/C com‐
pressor must be replaced. Refer
to the Parts Catalog.
2 - Compressor
❑ for removing the compressor from bracket and re-installing in vehicles with a 6-cylinder engine, refer to
⇒ "3.7 Compressor on Bracket, Removing and Installing", page 27
❑ On an 8-cylinder vehicle, it is necessary to evacuate the refrigerant circuit in order to remove the A/C
compressor from the bracket. Refer to
⇒ "16.4 Compressor, Removing and Installing (Vehicles with 8-Cylinder FSI Engine)", page 283
Compressor, 8-Cylinder FSI and 8-Cylinder TDI, Removing and Installing).
❑ On a 12-cylinder vehicle, it is necessary to evacuate the refrigerant circuit in order to remove the A/C
compressor from the bracket. Refer to
⇒ "16.3 Compressor, Removing and Installing (Vehicles with 12-Cylinder TDI Engine)", page 280
Compressor, 12-Cylinder TDI, Removing and Installing).
❑ When installing refrigerant lines/hoses and pertaining bracket, make sure there is a sufficient gap be‐
tween belt, bracket and belt pulley
❑ Depending on time period of production and on engine, compressor construction type may vary. Refer
to the Parts Catalog.
❑ At the start of production compressors manufactured by "Denso" are installed. Refer to the Parts Catalog
und ⇒ Refrigerant R134a Servicing; Rep. Gr. 87 ; A/C System General Information (Refrigerant R134a,
Servicing; Refrigerant R134a Capacities, Refrigerant Oil and Approved Refrigerant Oil).
❑ These compressors are available as replacement parts with different oil fill capacities, therefore note
capacity on compressor and the exact part number. Refer to the Parts Catalog. The reason for the
different oil capacities in the compressor for an otherwise identical refrigerant circuit lies in the design of
the compressor itself, note these oil capacities. 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 com‐
pressor.
Heating, Ventilation and Air Conditioning - Edition 04.2013
1)
.
Audi Q7 2007 ➤
1)
.
3. Refrigerant Circuit
(A/C
(A/C
13