2005 Citroen XSARA PICASSO check engine

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CONDITIONING
438
Tools.
[1] Clim test 2 VALEO: 4372-T
Checks.
Position the tool [1]
(depending on manufacturer's instructions).
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
E5AP2ECC
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Checking.
Position the toolCLIM TEST II
(according to the manufacturer's instructions).
Preliminary operations.
Close all the front air vents.
Start the engine.
Open the front LH air vent.
Position the air distribution control to«frontal flow».
Activate the«air recirculation» control.
Activate the«air conditioning» control.
Positions of the air conditioning controls:
- Temperature control on maximum cold.
- Blower control in maximum speed position.
Let the air conditioning operate for5 minutes.
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
E5AP2FAC
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AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Interpretation of the measurements.
«m»:High pressure.«s»:Over-heating (SC).
«n»:High temperature.«t»:Ambient air temperature.
«p»:Under-cooling (SR).«u»:Blown air temperature.
«q»:Low pressure.«v»: Humidity.
«r»:Low temperature.«w»: Temperature T3.
Under-cooling.
The under-cooling represents the difference between the condensation temperature and the aircon
fluid temperature at the aircon condenser outlet.
The under-cooling gives the quantity of aircon fluid
(in the liquid state)in the air conditioning circuit.
Values for under-cooling (SR).
Values «p» Origins Solutions
SR < 2°CLack of aircon fluid in the aircon condenser
(should be more than 150grammes)
Add some
2°C < SR <4°CLack of aircon fluid in the aircon condenser aircon fluid
(should be around 100to 150grammes)
4°C < SR < 10°C/12°CCorrect quantity
SR > 10°C/12°CRemove some
Excess aircon fluid in the aircon condenser aircon fluid
SR > 15°C
Blown air temperature «u».
The blown air temperature should be between 2°Cand 10°C.
E5AP2FBC
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Downloaded from www.Manualslib.com manuals search engine 441
AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Interpretation of the measurements.
«m»:High pressure.«s»: Over-heating (SC).
«n»:High temperature.«t»:Ambient air temperature.
«p»:Under-cooling (SR).«u»:Blown air temperature.
«q»:Low pressure.«v»:Humidity.
«r»: Low temperature.«w»: Temperature T3.
Over-heating (SC).
The over-heating represents the difference between the aircon fluid temperature at the evaporator outlet
and the evaporation temperature.
The over-heating gives the quantity of aircon fluid (in the liquid state) in the air conditioning circuit
Values for over-heating (SC).
Values «s» Origins Solutions
2° < SC < 15°CCorrect quantity
SC > 15°CLack of aircon fluid in the cooling circuitAdd some
aircon fluid
SC < 2°CExcess aircon fluid in the cooling circuitRemove some
aircon fluid
Blown air temperature «u».
The blown air temperature should be between 2°Cand 10°C.
E5AP2FBC
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Downloaded from www.Manualslib.com manuals search engine AIR
CONDITIONING
442
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Interpretation of the diagnosis
«x»Check satisfactory
«y»Lack of aircon fluid in the aircon circuit
«z» Excess aircon fluid in the aircon circuit
«aa» Filtering and drying cartridge clogged
«ab»Other problems
(see table on previous page)
E5AP2FCD
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CONDITIONING
443
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table
Principal problem Symptom Possible causes
Aircon compressor clutch
Lack of aircon fluid in the aircon circuit
The clutch of the aircon compressor does not Aircon pressostat
engage, or disengages suddenly Aircon evaporator sensor
The aircon compressor does not turn Electrical circuit
(wiring, fuses, etc.)
or stops suddenly
Auxiliaries drive belt
Aircon compressor
The clutch of the aircon compressor remains Filtering and drying cartridge
engaged and stops suddenly
Aircon pressure reducer
Leak of aircon fluid
Aircon compressor clutch
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Downloaded from www.Manualslib.com manuals search engine AIR
CONDITIONING
444
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table
Principal problem Symptom Possible causes
Incorrect adjustment of the aircon compressor
clutch
The clutch of the aircon compressor Aircon fluid quantity
remains engaged
Aircon compressor defective
The aircon compressor makes an abnormal Lack of aircon fluid in the aircon circuit
noiseAircon compressor valves defective
The clutch of the aircon compressor Aircon compressor clutch
remains engaged and slips
Auxiliaries drive belt
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Downloaded from www.Manualslib.com manuals search engine AIR
CONDITIONING
445
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table
Principal problem Symptom Possible causes
Low pressure and high pressure too highAircon pressure reducer defective
Duct clogged
Low pressure too high and high pressure too low Aircon compressor seal defective
Aircon evaporator sensor defective
Low pressure too low and high pressure too high Aircon pressure reducer jammed
Abnormal levels of pressuretoo high
Filtering and drying cartridge obstructed
Duct clogged
Duct clogged
Aircon pressure reducer jammed
Low pressure and high pressure too low
Lack of aircon fluid in the aircon circuit
Aircon compressor defective
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