Audi Air conditioning 2003 A8 Workshop Manual page 132

Audi A8 2003 ➤
Air conditioning - Edition 09.2010
– Compare the measured value indicated in the display zone (for
the evaporator output temperature sender -G263- ) to the val‐
ues in the graph.
A - Air temperature measured by evaporator output temperature
sender -G263-
B - Ambient temperature
C - Permissible tolerance range
Depending on the ambient temperature, the measured air tem‐
perature must be within the stated tolerance range after 5 mi‐
nutes.
♦ If the required values are not attained, check the measured
value of the evaporator output temperature sender -G263- and
compare the measured values displayed for the evaporator
output temperature sender -G263- to the measured values for
the left vent temperature sender -G150- and right vent tem‐
perature sender -G151- :
– If the measured values for the left vent temperature sender -
G150- and the right vent temperature sender -G151- only
deviiate slightly from the measured value for the evaporator
output temperature sender -G263- : Perform the measures to
be taken if the readout does not match the specification
⇒ page 128 .
– If the measured value of the evaporator output temperature
sender -G263- is higher than that of the left vent temperature
sender -G150- and the right vent temperature sender -G151- ,
check proper installation of the evaporator output temperature
sender -G263- and perform the electrical check for this sender
⇒ page 107 and ⇒ "Guided fault-finding" function of vehicle
diagnostic, testing and information system VAS 5051.
Note
Operation of the air conditioner is apparent, for example, from the
fact that the refrigerant pipe on the low pressure end (thick pipe)
cools down.
If the measured value of the evaporator output temperature send‐
er -G263- (and thus the system cooling output) is OK:
– Compare the measured value for the evaporator output tem‐
perature sender -G263- to the measured values for the left
vent temperature sender -G150- and the right vent tempera‐
ture sender -G151- .
– After 5 minutes, the measured values for -G150- and -G151-
must not be more than 3 °C higher than that for -G263- .
– If the measured value for the evaporator output temperature
sender -G263- is OK and the measured value for the left vent
temperature sender -G150- and /or the right vent temperature
sender -G151- is more than 3°C higher than the measured
value for -G263- , perform the measures to be taken in the
event of a temperature increase downstream of the evaporator
⇒ page 130
If the required values are not attained, compare the measured
values displayed for -G150- and -G151- to one another.
♦ If the measured values for -G150- and -G151- are OK, check
actuation and operation of the left heat regulation valve -
N175- , the right heat regulation valve -N176- and the coolant
circulation pump -V50-
ing" function of vehicle diagnostic, testing and information
system VAS 5051.
126
Rep. gr.87 - Air conditioning system
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with respect to the correctness of information in this document. Copyright by AUDI AG.
⇒ page 132 and ⇒ "Guided fault-find‐