2004 Citroen C2 Air pressure

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SPECIAL FEATURES: AIR CONDITIONING SYSTEM (R 134.a)
Compressor lubricant
ESSENTIAL: The compressor lubricant is extremely hygroscopic; always use FRESH oil.
Checking the compressor oil level
There are three specific cases:
1/
Repairs to a system without leaks.2/Slow leak.3/Fast leak.
1/ Repairing a system without leaks.
a)Using draining/recovery equipment not fitted with an oil decanter.
Drain the system as slowly as possible via the LOW PRESSUREvalve, so as not to lose any oil.
No more oil should be added when filling the system with
R 134.a fluid.
b) Using draining/filling equipment fitted with an oil decanter. Drain the R 134.afluid from the system in accordance with the instructions in the equipment handbook.
Measure the amount of oil recovered.
Add the same amount of
NEWoil when filling the system with R 134.afluid.
c) Replacing a compressor. Remove the old compressor, drain it and measure the oil quantity.
Drain the new compressor (supplied full), so that the same amount of NEWoil is left in the compressor as was in the old compressor.
No more oil should be added when filling the system with R 134.afluid.
AIRCONAIRCON

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AIRCONAIRCON
AIR CONDITIONING SYSTEM R 134.a
Testing procedure
Conditions inside the vehicle.
Positions of the air conditioning controls:
Maximum cold.
Maximum blower power.
Air distribution on
«ventilation»with the air vents open.
Position the air inlet flap to outside air.
WARNING:For RFTA (1), disconnect the air inlet motor connector, first
ensuring that it is in the outside air position.
(1) RFTA= Fully automatic air conditioning.
Test procedure.When all these conditions are met, proceed in the following order:
Measure the temperature in the workshop approx. one metre in front of
the vehicle’s air inlet grille.
Start the engine
(without the air conditioning, or the blower, operating)and wait for the cooling fan slow speed to trigger (should the engine tem
perature not rise sufficiently, it is permissable to increase the engine
speed to 2000 rpm)
.
Once it is sufficiently hot in the engine compartment, return the engine
to idle and commence the test.Switch on the air conditioning and adjust the engine speed to
2500 rpm.
In an ambient temperature of 40°C, the engine speed will be brought
down to 2000 rpm, in order for the pressure safety threshold to cut off the
compressor.
For further temperatures/pressures: see Tables and Graphs on following
pages
221, 222 and 226.
After
3 minutesof operation, note down the following 3 parameters:
The temperature of the blown air coming out of the 2 central air vents
(take the average).
The high pressure, via the intermediary of the clickfit union (at the
pressure reducer inlet).
The low pressure, via the intermediary of the clickfit union (at the pressure
reducer outlet).NOTE:The low and high pressures are absolute pressures.
When measuring the blown air temperatures, avoid any contact between
the thermocouple and the air vents.
At the conclusion of the test involving vehicles with
«RFTA»
ALL TYPES

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26 ± 2 23,2 ± 2 21 ± 2 19,2 ± 2 15,3 ± 2 15 ± 2
4,3 ±2 3,4 ± 2 3,1 ± 2 2,8 ± 2 2,7 ± 2
25,2 ±223,6 ± 2 21,4 ± 2 20 ± 2 17,6 ± 2 14,5 ± 2
3,5 ± 2 3 ± 2 2,8 ± 2 2,5 ± 2 2,4 ± 2
26,2 ± 2 23,2 ± 2 21 ± 2 19,2 ± 2 15,3 ± 2 15 ± 2
4,3 ± 2 3,4 ± 2 3,1 ± 2 2,8 ± 2 2,7 ± 2
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Checking pressures
Tools. 1
charging station. 2thermometers.
Once the preliminary conditions, vehicle equipment and checks havebeen fulfilled
(see table). After the air conditioning has been on for
three minutes, record the following parameters: The temperature of the air coming from the central vents
(see table).
The High Pressure. The Low Pressure.
Compare the values recorded with the table below, or the graphs.
Ambient temperature in °C40 35 30 25 20 15
VehiclesEngines
C3
C3
C3 PlurielKFV
NFUHigh pressure (Bars)
Low pressure (Bars)
Low pressure (Bars)
High pressure (Bars)
Low pressure (Bars)8HX 8HWVehicle using R134.a fluid
(Compressor with variable capacity)
High pressure (Bars)
AIRCONAIRCON
C3 C3 PLURIEL XSARA XSARA PICASSO KFV

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AIRCON
23 ± 2 22,5 ± 2 20 ± 2 17 ± 2 15,5 ± 2 14,5 ± 2
3,8 ± 0,2 3,6 ± 0,2 3,5 ± 0,2 3,1 ± 0,2 3 ± 0,2 2,9 ± 0,2
24,5 ±221,5 ±2 18,5 ± 2 17 ± 2 15,5 ± 2
4 ±0,2 3,8 ± 0,2 3,5 ± 0,2 3,2 ± 0,2 3 ± 0,2
21,5 ± 2 22,5 ± 2 20 ± 2 18 ± 2 16,5 ± 2 15,6 ± 2
3,2 ±0,23,3 ±0,23 ±0,22,8 ± 0,2 2,6 ± 0,2
25,5 ±320,5 ±318 ± 3 20 ± 3 13,5 ± 3 11 ± 3
4 ±0,33,5 ± 0,3 3 ± 0,3
25 ± 3 22,5 ± 3 20 ± 3 17 ± 3 15 ± 3
4 ±0,33,5 ± 0,3 3 ± 0,3
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Checking pressures
Tools. 1
charging station. 2thermometers.
Once the preliminary conditions, vehicle equipment and checks havebeen fulfilled
(see table). After the air conditioning has been on for
three minutes, record the following parameters: The temperature of the air coming from the central vents
(see table).
The High Pressure. The Low Pressure.
Compare the values recorded with the table below, or the graphs.
Ambient temperature in °C40 35 30 25 20 15
VehiclesEngines
XSARA
XSARA
PICASSOTU
EW
High pressure (Bars)
Low pressure (Bars)
Low pressure (Bars)
High pressure (Bars)
Low pressure (Bars)DWVehicle using R134.a fluid
(Compressor with variable capacity)
High pressure (Bars)
XSARA XSARA PICASSO
High pressure (Bars)
Low pressure (Bars)
High pressure (Bars)
Low pressure (Bars)
TU
EW
DW

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AIRCONAIRCON
(1)High pressure valve.
(2)Low pressure valve.
(3)Pressostat.
(4)Filter.
Tightening torques (m.daN).
(a) : 0,6
(b) : 0,6
(c) : 0,6
(d) : 0,6
(e):0,6
(f) : 0,7
C5HP19UP
C2AIR CONDITIONING SYSTEM R 134.a

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AIRCON
AIR CONDITIONING SYSTEM R 134.a
(1)High pressure valve.
(2) Low pressure valve.
(3) Filter.
(4)Pressostat.
Tightening torques (m.daN).
(a) : 0,6
(b) : 0,6
(c) : 0,6
(d) : 0,6
(e):0,6
(f) : 0,6
C5HP17SP
C3 C3 PLURIEL

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AIRCONAIRCON
AIR CONDITIONING SYSTEM R 134.a
Checks on the air conditioning circuit
C5HP1A5D
Key.
T/P
= Average temperature (°C)at the air vents/
high pressure (Bars).
P= Low pressure (Bars).
Te= Exterior temperature (C°).
HP= Pressure at compressor outlet (Bars).
BP= Pressure at compressor inlet (Bars).
TA = Average temperature (°C)of air blown from the
central vents.
C3 C3 PLURIEL BVA KFV

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AIRCON
AIR CONDITIONING SYSTEM R 134.a
Checks on the air conditioning circuit
C5HP18GD
Key.
T/P
= Average temperature(°C ) at the air vents/
high pressure(Bars).
P = Low pressure(Bars).
TE = Exterior temperature(C°).
HP = Pressure at compressor outlet(Bars).
BP = Pressure at compressor inlet(Bars).
TA = Average temperature(°C) of air blown from
the central vents.
C3 C3 PLURIEL NFV