Audi Q7 2007 Repair Manual page 244

Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
of thermometer (measure temperature of air flowing out of in‐
strument panel vents on left and right sides). The displayed or
measured 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.
Testing rear A/C system (only for vehicles with this optional equip‐
ment)
Note
Before testing rear heating performance, front heating per‐
♦
formance must be check, only if this is OK is the rear heating
performance to be checked.
When testing front heating performance, the temperature pre‐
♦
select "Lo" is set for the left and right sides on Rear A/C Display
Control Head - E265- , it must remain at this setting when
starting the test for the rear.
– Start engine.
– On vehicles with a rear A/C system, perform Guided Fault
Finding for Rear A/C Display Control Head - E265- of A/C sys‐
tem. Use the Vehicle Diagnostic Tester via the "Guided Fault
Finding" function.
– In the Rear A/C Display Control Head - E265- select "read
measured values block" the display group with the measured
values from the Left Rear Vent Temperature Sensor - G405-
and the Right Rear Vent Temperature Sensor - G406- . Use
the Vehicle Diagnostic Tester via the "Guided Fault Finding"
function.
– A value below 20° C is displayed in the display fields with the
measured values form the left -G405- and the right -G406- rear
vent temperature sensors.
Note
If the temperature measured five minutes after starting engine is
still greater than 20° C (68° F), perform cooling performance test.
Refer to ⇒ "13 A/C Unit, Checking Cooling Output", page 215
– Set temperature preselect to "HI" for left and right sides on
Rear A/C Display Control Head - E265- .
– Observe the display with the measured values from the left
rear vent temperature sensor -G405- and the right rear vent
temperature sensor -G406- . The temperature displayed must
correspond approximately to the current engine temperature
on left and right sides after a short period of time (permissible
deviation maximum 20° C (68° F)).
238
Rep. Gr.87 - Air Conditioning
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