Checking Cooling Output - Audi Air conditioning 2003 A8 Workshop Manual

air blower -V2- from passenger compartment beneath dash
panel)
– No operation of coolant circulation pump -V50-
– Left heat regulation valve -N175- and right heat regulation
valve -N176- closed (coolant hoses/coolant pipes to heating
system heat exchangers cool down)
Note
If one of these test requirements is not satisfied, interrogate the
fault memory of the front operating and display unit, Climatronic
control unit -J255- , perform final control diagnosis and read out
the measured value block ⇒ "Guided fault-finding" function of
vehicle diagnostic, testing and information system VAS 5051.
11.2

Checking cooling output

Prerequisites for checking cooling output satisfied
– Measure the ambient temperature (must be above 15 °C).
– Close the doors, front lid, windows and sun roof.
– Open all dash panel vents.
– Switch on ignition.
– Set „Econ" mode on MMi (A/C mode off).
– Close the vents in the „B" pillar.
– Set the handwheel for the variable temperature centre vent to
„Warm".
– Start the engine.
– Start air conditioner guided fault-finding ⇒ "Guided fault-find‐
ing" function of vehicle diagnostic, testing and information
system VAS 5051.
– In the „Reading measured value block" function, select the
display group with the following values (actuation of the air
conditioner compressor regulating valve -N280- and meas‐
ured value of the high-pressure sender -G65- ) and check the
display ⇒ "Guided fault-finding" function of vehicle diagnostic,
testing and information system VAS 5051.
♦ Actuation of the compressor via the air conditioner compres‐
sor regulating valve -N280- deactivated (compressor switched
off, display in display zone 0%)
♦ Pressure in refrigerant circuit transmitted by the high-pressure
sender -G65- equal to or greater than the value in the table at
the measured ambient temperature
Ambient temperature in °C
15
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Displayed pressure (in bar ab‐
solute)
4,7
5,6
6,6
7,6
8,8
Audi A8 2003 ➤
Air conditioning - Edition 09.2010
11. Checking cooling output of air conditioner
123