Audi Q7 2007 Repair Manual page 245

Note
If deviation for engine temperature is greater than 20° C (68° F),
or between left and right measured values greater than 10° C (50°
F), check ventilation of heater core (refer to
⇒ "7 Coolant Circuit, Bleeding", page 78
incorporation of rear A/C system into coolant circuit (refer to
⇒ "6 Incorporation of the A/C System in Vehicle Coolant Circuit",
page 66 ), activation of function of control motors for temperature
doors in rear A/C unit ( Right Rear Temperature Door Motor -
V314-
⇒ "9.43 Right Rear Temperature Door Motor V314 , Removing
and Installing", page 186
- V313-
⇒ "9.46 Left Rear Temperature Door Motor V313 , Removing and
Installing", page 188 ) and of Coolant Recirculation Pump - V50-
( Water Pump - V36- ). Use the Vehicle Diagnostic Tester via the
"Guided Fault Finding" function.
– Switch engine off and then ignition on again.
– Set an intermediate fresh air blower speed on Rear A/C Dis‐
play Control Head - E265- .
Note
At maximum fresh air blower speed, the delivery rate of Coolant
Recirculation Pump - V50- ( Water Pump - V36- ) is no longer
sufficient and the outlet temperature sinks relatively quickly to a
value of approximately 40° C (104° F).
– Perform Guided Fault Finding and read the display with the
measured values from the left rear vent temperature sensor -
G405- and the right rear vent temperature sensor -G406- .
– Observe the display with the measured values from the left
rear vent temperature sensor -G405- and the right rear vent
temperature sensor -G406- . The displayed temperature sinks
slowly along with the engine coolant temperature.
Note
If the displayed or measured temperature decreases relatively
quickly, check activation and functionality of Coolant Recircula‐
tion Pump - V50- ( Water Pump - V36- ). Use the Vehicle Diag‐
nostic Tester via the "Guided Fault Finding" function.
Heating, Ventilation and Air Conditioning - Edition 04.2013
) (bleed cooling circuit),
and Left Rear Temperature Door Motor
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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.
14. Heating Performance of A/C System, Checking
Audi Q7 2007 ➤
239