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♦ Radiator and condenser are clean (if necessary clean)
♦ The ribbed belt, which drives the A/C compressor, is OK and
is tensioned correctly. The ribbed belt is actually driving the A/
C compressor.
♦ All air ducts, covers and seals OK and properly installed
♦ Air flow through dust and pollen filter not obstructed by dirt.
♦ Air intake apparatus (in fresh air and recirculating air mode) is
not impaired by soiling or components installed as retrofit.
♦ Vehicle not exposed to sunlight
♦ Engine is warm
♦ Climatronic control module -J255- DTC memory was checked
and erased, basic setting was performed and Climatronic con‐
trol module coding was checked. Refer to -VAS5051B- under
"Guided Fault Finding."
♦ The Climatronic control module was checked using -
VAS5051B- under "Guided Fault Finding."
♦ All instrument panel vents open
♦ The hood is closed.
♦ Settings on Climatronic control module:
– “Auto“ operating mode (indicator light on the AUTO button
lights up).
– Turn the temperature rotary switch to “cold“
– The A/C compressor is on (the indicator lamp on the AC button
comes on).
– Fresh air blower rotary switch in “maximum speed“ stop.
♦ Functions with engine running:
– The radiator fan ( Coolant fan -V7- and Coolant fan 2 -V177- )
run (activation and speed depend on pressure in coolant cir‐
cuit and engine temperature).
Note
Depending on the version of the Climatronic control module, the
radiator fans (coolant fan and coolant fan 2) are only switched on
at a certain pressure in the coolant circuit (currently, at a pressure
of approximately 9 bar). The radiator fan(s) control is displayed in
the measured values block using -VAS5051B- under "Guided
Fault Finding."
– Fresh Air Blower -V2- runs at maximum speed.
– The air conditioner goes in recirculation mode (approximately
1 minute after starting the vehicle, the back pressure/fresh air
door is closed and the recirculation door is opened, Fresh Air
Blower -V2- extracts the air from passenger compartment be‐
low instrument panel / glove compartment).
Note
If one of these test requirements is not fulfilled, check the DTC
memory, perform a final control diagnosis and read the measured
values block using -VAS5051B- under "Guided Fault Finding."
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
80 Rep. Gr.87 - Air Conditioning
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