display RENAULT TWINGO 2009 2.G Air Conditioning Workshop Manual

62A-4
AIR CONDITIONING
Air conditioning: Check
AIR CONDITIONING or CLIMATE CONTROL
62A
I - PREPARATION OPERATION FOR THE
MEASUREMENT DEVICE
aCheck that the measurement device functions prop-
erly (see the device's instruction manual).
aSet units to ˚C.
aSet the device's sensitivity to 0.1˚C.
aSet the reading mode to (∆T) = (T1 - T2)aCheck the two sensors T1 and T2 in order to calcu-
late the correction (∆) to be applied to the measure-
ment (T1 - T2). the two sensors must indicate the
same measurement under the same conditions.
Check the sensors by:
-bringing the ends of the 2 sensors together until
they touch,
-placing the sensors in the air flow of an air vent,
-setting the passenger compartment fan assembly
to top speed.
-waiting for the value to become stable.
-recording the correction value (∆). Equipment required
Dual-sensor temperature measuring device
Note:
When performing RENAULT maintenance, check
the air conditioning system at the end of the vehi-
cle's maintenance program so that the engine will
be cold.
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Note:
It is not necessary to start the vehicle. The
device display is in mode (∆T) = (T1 - T2).
WARNING
Note the diff erence and sign as soon as the tem-
per ature becomes stable.
Calculate the correction (∆) = - (T1 - T2) to be
applied to the measurement (∆T).
Examples:
If (T1 - T2) = - 0.3˚C, correct the measurement
(∆T) by (∆) = + 0.3˚C
If (T1 - T2) = + 0.3˚C, correct the measurement
(∆T) by (∆) = - 0.3˚C

62A-5
AIR CONDITIONING
Air conditioning: Check
AIR CONDITIONING or CLIMATE CONTROL
62A
II - VEHICLE PREPARATION OPERATION
aPut the vehicle in the shade, where the temperature
is greater than or equal to 15˚C minimum.
aClose the bonnet.
aOpen the front windows.
aStart the engine and let it idle.
aSet the air conditioning controls with:
-recirculation mode in the external position,
-the ventilation distribution in "face" mode,
-the temperature control to coldest temperature set-
ting in front (and at the back, if it exists),
-the speed of the passenger compartment fan as-
sembly set to maximum (switch off the rear control
if it exists),
-the front side and centre air vents open with the
vanes in a neutral position,
-the air conditioning system must be turned on (indi-
cator light illuminated).
aWait 5 minutes with the engine idling before tak-
ing any measurements.
III - MEASUREMENTS
aRecord the air temperature at the scuttle panel grille
(T3).
-open the bonnet, depending on the vehicle, to ac-
cess the scuttle panel grille.
-place the sensor where air is drawn through the
scuttle panel grille.-wait for the value to become stable.
-record the T3 temperature value.
-close the bonnet if it was opened.
aRecord the air temperature at the left air vent (T1),
and at the right air vent (T2).
-fit sensor T1 in the left air vent (1) .
-fit sensor T2 in the right air vent (2) .
aRecord the differences in temperature once the (∆T)
value has stabilised:
-between T3 and the higher of values T1 or T2, (T3
- highest value).
-record this difference in temperature.
-between T1 and T2 (read the (∆T) value (T1-T2)
display mode).
-record the difference in temperature (∆T) accord-
ing to the correction (∆) to be applied to the mea-
surement.
aIf the (∆T)=(T1-T2) measurement is unstable, follow
the procedure below:
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Note:
Depending on the vehicle's air conditioning sys-
tem programming, this check method may not be
applicable because the engine cooling fan
assembly has been activated. Its operation ren-
ders the (∆Τ) value between T1 and T2 unstable.
To eliminate this error, the fan assembly must be
activated for the entire period over which temper-
ature T1 and T2 measurements are recorded.