Audi A4 2001 - Page 159

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
with respect to the correctness of information in this document. Copyright by AUDI AG.
• Fault Finding did not detect any faults in the electrical system
or in the vacuum system.* Refer to Vehicle Diagnosis, Testing
& Information System -VAS5051B- (“OBD“ or “Guided Fault
Finding for the A/C system“) and ⇒ Heating, Ventilation and
Air Conditioning; Rep. Gr. 87 ; Diagnosis and Testing (vehicle-
specific repair manual).
• Air conditioner On Board Diagnostic (OBD) has not revealed
any faults (with engine running and air conditioner switched
on), no compressor shutoff criterion displayed in measured
value block (vehicles with Air conditioner On Board Diagnostic
only)* Refer to Vehicle Diagnosis, Testing & Information Sys‐
tem -VAS5051B- (“OBD“ or “Guided Fault Finding for the A/C
system“) and ⇒ Heating, Ventilation and Air Conditioning;
Rep. Gr. 87 ; Diagnosis and Testing (vehicle-specific repair
manual).
• Air flow through dust and pollen filter not obstructed by dirt*
• Air conditioner unit not drawing in secondary air at maximum
fresh-air blower speed*, evaporator and heater not drawing in
secondary air at maximum fresh-air blower speed*
• Air doors in air conditioner unit, heater and evaporator reach
end position*
• Fresh-air intake ducts beneath hood and in passenger com‐
partment as well as corresponding water drain valves OK* .
Refer to ⇒ Heating, Ventilation and Air Conditioning; Rep. Gr.
87 ; Diagnosis and Testing (vehicle-specific repair manual).
• Engine is warm
• Vehicle not exposed to direct sunlight. Refer to Refer to ⇒
Heating, Ventilation and Air Conditioning; Rep. Gr. 87 ; Diag‐
nosis and Testing (vehicle-specific repair manual).
• Ambient temperature greater than 15° C
• All instrument panel vents open
– Start the engine.
Adjustment at Front A/C display control head -E87- or Climatronic
Control Module -J255- (and Rear A/C display control head -E265-
in vehicles with two A/C units):
– Preselect “Auto“ mode (A/C compressor on).
– Set temperature pre-selector switch to LO for driver's side and
front passenger's side (and left and right rear seats in vehicles
with two A/C units).
Setting on heater controls:
– Press A/C button and Rec- or recirculated air button.
– Turn rotary temperature control towards cold stop.
– Set rotary fresh-air blower control to 4.
The following system test conditions should be met:
• One or more Radiator fan -V7- operated (at least speed 1)*
Note
For some versions, fan is switched on only once the pressure in
refrigerant circuit has exceeded a specified value.
• Fresh Air Blower -V2- (and Rear Fresh Air Blower -V80- in
vehicles with two A/C units) running at maximum speed.
Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A ...
Refrigerant R134a Servicing - Edition 01.2011
4. Diagnosis and Testing 155