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– Check and compare the displayed values from the left footwell
vent temperature sensor, from the right footwell vent temper‐
ature sensor and from the evaporator vent temperature sensor
with each other.
♦ Temperature maximum 12 °C (depending on ambient tem‐
perature), deviation between measured values less than 3 °C.
– Adjust air output direction via the air distribution rotary switch
on the Climatronic control module to “Instrument panel vents“.
– Check and compare the measured values from the left front
upper body outlet temperature sensor -G385- and from the
evaporator vent temperature sensor.
♦ Temperature maximum 12 °C (depending on ambient tem‐
perature), deviation between measured values less than 3 °C.
– Place Climatronic control module temperature rotary switch in
“Warm“ stop.
– Place fresh air blower rotary switch in “maximum speed“ stop.
– Adjust air outlet direction (using air distribution rotary switch
on Climatronic control module) so an approximately equal por‐
tion of air comes out of “instrument panel vents“ and “footwell
vents“.
Note
The air distribution rotary switch can also be adjusted so air only
comes out of “instrument panel vents“ or “footwell vents“. In that
case, only the measured value from the temperature sensor in‐
stalled in the selected vent may be used (if necessary, adjust air
output direction so it alternates between “instrument panel vents“
and “footwell vents“).
– Check and compare the displayed values from the left front
upper body outlet temperature sensor, from the left footwell
vent temperature sensor and from the right footwell vent tem‐
perature sensor with each other.
Target values:
♦ The temperature goes above 55 °C (depending on the engine
temperature) in the display fields with the measured values
form the left front upper body outlet temperature sensor, from
the left footwell vent temperature sensor and from the right
footwell vent temperature sensor.
If the specified values are not reached, check the following:
– Ventilation of coolant circuit. Refer to⇒ Engine Mechanical;
Rep. Gr. 19 ; Description and Operation .
– The integration of the heater core in the coolant circuit. Refer
to⇒ Engine Mechanical; Rep. Gr. 19 ; Description and Oper‐
ation .
– Activation and function of Left Temperature Door Motor -V158-
and of Right Temperature Door Motor -V159- , refer to
⇒ “4.2.4 Temperature Increase Downstream from Evaporator,
Determining Malfunction“, page 88 ,
⇒ “4.6 Heating Performance Of A/C System, Checking“, page
93 and Vehicle diagnosis, testing and information system -
VAS5051B- under "Guided Fault Finding".
– Foam seal on heater core for heater of A/C unit. Refer to
⇒ “5.14 Heater Core“, page 144 .
– Function of temperature doors in air distribution housing, refer
to
Audi TT 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 01.2011
4. Diagnosis and Testing 95
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