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77
Two versions of externally controlled com-
pressors are used in the Audi A4:
– the 6-piston compressor, which you have
already studied in detail in SSP 240,
– the 7-piston compressor, which differs in
the number of pistons and the resulting
increased displacement.
Depending on the country-specific vehicle
version, the 7-piston compressor with its
higher total output is used (e.g. in hot coun-
tries).
Based on the engine version installed, a dis-
tinction is made between the following com-
pressor
types:
– 6 and 7 pistons for compressor fitted on
right side of engine,
– 6 and 7 pistons for compressor fitted on
left side of engine,
– 6 pistons for 6-cylinder TDI Diesel mechani-
cal units.
Vehicles equipped with a 7-piston
compressor, are fitted with a radiator fan
which has a higher output. Distinguishing features to identify the com-
pressor fitted are:
– Lettering on the compressor identification
plate is 6SEU for the 6-cylinder or 7SEU for
the 7-cylinder compressor.
– the greater outer diameter of the
7-cylinder compressor (approx. 122 mm)
compared to the smaller outer diameter of
the 6-cylinder compressor
(approx. 113 mm)
7-piston compressor
SSP254_033
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83
153.95244km9:3628.07.2000
Diagnosis connection
Radiator fan control unit J293
Radiator fan V7
Regulating valve for air con-
ditioner compressor N280
Central flap control motor V70 and
potentiometer G112 Control unit
for air conditioner Automatic gearbox
control unit J217
Motronic control unit J220
Defrost flap control motor V107 with
potentiometer G135
Motor for air flow flap V71 with
potentiometer G113
Temperature flap positioning motor V158
(right) with potentiometer G221
Series resistor for fresh air blower N24,
control unit for fresh air blower J126 with
fresh air blower V2
Signals:
ECON signal
Engine speed increase
Air conditioner compressor Control unit with display in dash
panel insert J285
Diagnosis interface for data bus
J533 (gateway)
Air recirculation flap control motor V113
for potentiometer G143
Temperature flap control motor V158
(left) with potentiometer G220
SSP254_041
