Audi Q7 2007 Repair Manual page 242

Audi Q7 2007 ➤
Heating, Ventilation and Air Conditioning - Edition 04.2013
Note
At this setting, the Coolant Recirculation Pump - V50- ( Water
Pump - V36- ) is not actuated by the A/C system. Depending on
coolant temperature, Coolant Recirculation Pump - V50- ( Water
Pump - V36- ) may possibly be actuated by engine control mod‐
ule. Use the Vehicle Diagnostic Tester via the "Guided Fault
Finding" function.
Testing front A/C system
Cold air flows from instrument panel vents and vents in center
console and in "B" and "C" pillars (on vehicles with a rear A/C
system).
– If the vehicle has the "Comfort" A/C system, read the meas‐
ured values from the Left Front Upper Body Vent Temperature
Sensor - G385- and the Right Front Upper Body Vent Tem‐
perature Sensor - G386- on the Climatronic Control Module -
J255- front A/C control head. Use the Vehicle Diagnostic
Tester via the "Guided Fault Finding" function.
– On vehicles with "Basic" version A/C system, measure tem‐
perature of air flowing from instrument panels vents on left and
right sides, for example using a thermometer.
– A value below 20° C (68° F) or a temperature below 20° C (68°
F) measured with a thermometer is displayed in the display
fields with the measured values from the left -G385- and right
-G386- front upper body 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 the Climatronic Control Module - J255- front A/C control
head preselector to "HI" for the left and right sides at front or
temperature preselect rotary switch to the "warm" stop.
– Observe the display in the display fields with the measured
values from the left -G385- and right -G386- front upper body
vent temperature sensors, or, measure of air flowing out of
instrument panel vents on left and right sides in alternation
using a thermometer. At an engine temperature of approxi‐
mately 90° C (194° F), the displayed or measured temperature
must be greater than 70° C (158° F) on left and right sides after
a short period of time. At a lower engine temperature, it must
correspond approximately to the current engine temperature
(permissible deviation 20° C (68° F) maximum).
236
Rep. Gr.87 - Air Conditioning
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