Checking Cooling Output Of Air Conditioner; Prerequisites For Checking Cooling Output - Audi Air conditioning 2003 A8 Workshop Manual

Audi A8 2003 ➤
Air conditioning - Edition 09.2010
11 Checking cooling output of air condi‐
tioner
Special tools and workshop equipment required
♦ Vehicle diagnostic, testing and information system -VAS 5051
A- (or Service Information System -VAS 5052- )
♦ Commercially available thermometer (for temperature meas‐
urement; if applicable use thermometer with 2 probes for
simultaneous measurement of temperature e.g. on right and
left)
11.1 Prerequisites for checking cooling out‐
put
♦ Ambient temperature above 15 ° C.
♦ Radiator and condenser clean (clean if necessary)
♦ Poly V-belt for compressor drive OK and correctly tensioned,
pulley actually driving compressor (vehicles with 6-cyl. engine,
8-cyl. MPI engine, 8-cyl. diesel engine or 12-cyl. engine)
♦ Compressor drive unit correctly installed, compressor actually
being driven (vehicles with 8-cyl. FSI engine or 10-cyl. engine)
⇒ page 161
♦ All air ducts, covers and seals OK and properly fitted
♦ Air flow through dust and pollen filter not impeded by contam‐
ination
♦ Vehicle not exposed to sunlight
♦ Engine warm
♦ Fault memory of front operating and display unit, Climatronic
control unit -J255- (and rear Climatronic operating and display
unit -E265- ) interrogated and erased, basic setting performed
and encoding of front operating and display unit, Climatronic
control unit -J255- checked ⇒ "Guided fault-finding" function
of vehicle diagnostic, testing and information system VAS
5051.
♦ Adaption of front operating and display unit, Climatronic con‐
trol unit -J255- (and rear Climatronic operating and display unit
-E265- ) checked ⇒ "Guided fault-finding" function of vehicle
Protected by copyright. Copying for private or commercial purposes, in part or in whole, is not
diagnostic, testing and information system VAS 5051 permitted unless authorised by AUDI AG. AUDI AG does not guarantee or accept any liability
with respect to the correctness of information in this document. Copyright by AUDI AG.
♦ All dash panel vents open
♦ Front lid closed
♦ Settings on front operating and display unit, Climatronic con‐
trol unit -J255- or on MMI (Multi Media Interface):
– „Auto" mode.
– „LO" temperature setting (for driver and front passenger side).
– Compressor on („Econ" function not active in MMI, A/C mode
on).
♦ Functions with engine running:
– Operation of radiator fans -V7- (speed governed by pressure
in refrigerant circuit and engine temperature)
– Operation of fresh air blower -V2- at maximum speed
– Switching of air conditioner to air recirculation mode (approx.
1 minute after starting engine, fresh-air/air flow flaps are
closed and air recirculation flap opened, air is drawn in by fresh
122
Rep. gr.87 - Air conditioning system