Get AIR CONDITIONING -> Checking efficiency (temperatures and pressures) Guide for Citroen Xantia 4 Door Second Generation (1993-2002)

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

CHECKING TEMPERATURES.

ALL TYPES

TOOLS

CHECKS.

If all these conditions are met, take the following action :

Two thermometers.

- Start the engine, with the air conditioning off, and wait for the cooling fan

first speed to cut in.

- Operate the air conditioning and set the engine speed to 2500 rpm.

Preliminary conditions.

Position of the air conditioning controls :

- Maximum cold air.

- Air blower in maximum position.

- Air distributor in "ventilation" position, with the dashboard vents open.

- Air intake flap in "exterior air" position.

NOTE : If the exterior temperature reaches 40 °C, the engine speed will

return to 2000 rpm in order to prevent the compressor from being cut off

by the High Pressure safety device (Pressostat).

After the air conditioning has been on for three minutes, measure :

- the exterior temperature in the workshop,

- the temperature of the air coming out of the central vents.

Conditions and vehicle equipment.

Compare the two values using the table overleaf.

- Bonnet closed.

- Doors and windows shut.

- Ensure the vehicle is in a sheltered area (away from wind, sun, etc..).

289

ALL TYPES

CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM

CHECKING TEMPERATURES. (continued)

Vehicle using R134.a fluid (Compressor with variable capacity)

Exterior temperature in °C

40

35

30

25

20

15

Vehicles

XANTIA

20 ± 3

24 ± 3

16 ± 3

18 ± 3

13 ± 3

15 ± 3

11 ± 3

13 ± 3

12 ± 3

8 ± 3

9 ± 3 ( )

*

Temperature in °Cat the

central vents

10 ± 3

XM

8 ± 3

SYNERGIE

( ) At exterior temperature 20°C, air temperature from the central vents is for second speed of the ventilator fan.

*

If fan operates at first speed, then air temperature from the central vents becomes 8.4 ± 3 °C.

NOTE : In general, the temperature of the air being blown from the central vents should be around 5°C to 8°C.

290

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

AIR CONDITIONING -> Checking efficiency (temperatures and pressures) for Your Citroen Xantia 4 Door Second Generation (1993-2002)

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