1994-2002 Citroen Synergie Van AIR CONDITIONING -> Checking Pressures User Manual
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AIR CONDITIONING -> Checking Pressures for Your Citroen Synergie Van First Generation (1994-2002)

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM  
ALL TYPES  
CHECKING PRESSURES  
TOOLS : 1 Charging station and 2 Thermometers.Observing the  
preliminary conditions, as well as vehicle equipment and checks  
(see page 287) :After the air conditioning has been operating for  
three minutes, record the following parameters :  
- The temperature of the air coming out of the central vents See the table on  
page 290).  
- The High Pressure.  
- The Low Pressure.Compare the values recorded with the table below, or  
the graphs.  
Vehicle using R134.a fluid (Compressor with variable capacity)  
40  
35  
30  
25  
20  
15  
Exterior temperature in °C  
Vehicles  
High pressure (Bars)  
Low pressure (Bars)  
High pressure (Bars)  
Low pressure (Bars)  
High pressure (Bars)  
Low pressure (Bars)  
High pressure (Bars)  
Low pressure (Bars)  
24 ± 3  
21 ± 3  
2.5 ± 3  
18 ± 3  
14 ± 3  
4 ± 0.3  
XANTIA (1)  
4 ± 3  
21 ± 3  
1.9 ± 3  
24 ± 0;3  
3 ± 0.3  
16 ± 3  
19 ± 3  
14 ± 3  
13 ± 3  
XANTIA (2)  
XM  
1.4 ± 0.3  
17 ± 3  
15 ± 3  
4 ± 0.3  
2.5 ± 0.3  
16 ± 3  
1.8 ± 0.3  
SYNERGIE  
2.1 ± 0.3  
1.8 ± 0.3  
(1) SANDEN Compressor (Petrol engines : all types) - (2) = HARRISON Compressor (Diesel engines : all types).  
If the parameters recorded do not correspond to those in the above table, refer to the table (see page 290).  
291  
 
ALL TYPES  
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM  
CHECKING PRESSURES (continued)  
Low pressuretoo low  
Low pressuretoo high  
Low pressurenormal  
- Insufficient fluid charge.  
- Constriction of the HP system.  
- Dirty pressure control valve.  
- Cooling fan speed unsuitable.  
- Faulty compressor.  
- Faulty pressure control valve.  
- Faulty compressor.  
High pressuretoo low  
High pressurenormal  
- Faulty compressor.  
- Dirty evaporator.  
- Circuit normal.  
- Cooling fan speed unsuitable  
- Presence of solid matter in the  
system.  
- Dirty condenser.  
- Excessive fluid charge.  
- Dirty condenser.  
- Faulty pressure control valve.  
- Cooling fan speed unsuitable.  
- Faulty pressure control valve.  
- System blocked.  
- Water in the system.  
High pressuretoo high  
Checking the pressure at temperatures between 15°C and 35°C for information only.  
In general, the pressure should be approximately :  
- for R134.a fluid, less than 2 Bars (Low pressure), and between 13 and 24 Bars (High pressure).  
292  
 

Related Topics

AIR CONDITIONING
R 134 a Quantities Special Features (Union Tools, Pollen Filters, Evaporator) Checking the Efficiency (Temperatures) System Diagrams and Torques (Xantia, XM, Synergie)

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