2005 CITROEN C6 engine

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AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Reminder (for information)
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 Origins Solutions
SR < 2°C Lack of aircon fluid in the aircon condenser
Add some aircon fluid
2°C < SR <4°CLack of aircon fluid in the aircon condenser
4°C < SR < 10°C/12°CCorrect quantity
SR > 10°C/12°C
Excess aircon fluid in the aircon condenser Remove some aircon fluid
SR > 15°C
Over-heating.
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 Origins Solutions
2° < SC < 15°CCorrect quantity
SC > 15°CLack of aircon fluid in the cooling circuit Add some aircon fluid
SC < 2°CExcess aircon fluid in the cooling circuit Remove some aircon fluid
Blown air temperature.
The blown air temperature should be between 2°Cand 10°C.
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AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table (for information)
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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AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table (for information)
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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AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table (for information)
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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AIR
CONDITIONING
CHECKING THE EFFICIENCY OF THE AIR CONDITIONING SYSTEM
Aircon circuit diagnosis table (for information)
Principal problem Symptom Possible causes
Low pressure normal and high pressure too high Presence of air in the aircon circuit
Low pressure normal and high pressure too lowAircon pressostat defective
Evaporator sensor defective
Abnormal levels of pressure Low pressure too high and high pressure normal Aircon pressure reducer jammed open
Filtering and drying cartridge saturated or
Low pressure too low and high pressure normal clogged
Aircon pressure reducer iced up
Under cooling too weak Lack of aircon fluid
Air conditioning operating inExcess aircon fluid
back-up mode
Under cooling excessive Presence of air in the aircon circuit
Filtering and drying cartridge clogged
NOTE: In all cases, measure the excessive heating (SC)and the blow air temperature.
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AIR
CONDITIONING
Tightening torques (m.daN).
(1)High pressure valve
(2)Low pressure valve
(3)Pressure reducer
(4)Pressure reducer outlet, tighten to: 0,6
(5)Pressure reducer inlet, tighten to: 0,6
(6)Clickfit union, tool: 8005-T.A Black
(7) Compressor inlet, tighten to: 0,7
(8)Compressor outlet, tighten to: 0,7
(9)Filtering cartridge: Not interchangeable
(10)Condenser outlet, tighten to: 0,6
(11)Pressostat, tighten to: 0,6
(12)Condenser inlet, tighten to: 0,6
(13)Buffer capacity
«a»Compressor front support: 3,9
«b»Compressor rear support: 2,5
C5HP1E0P
AIR CONDITIONING SYSTEM R.134.a
Engine: ES9A
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AIR
CONDITIONING
Tightening torques (m.daN).
(1)High pressure valve
(2)Low pressure valve
(3)Pressure reducer
(4)Pressure reducer outlet, tighten to: 0,6
(5)Pressure reducer inlet, tighten to: 0,6
(6)Clickfit union, tool: 8005-T.A Black
(7)Compressor inlet, tighten to: 0,7
(8)Compressor outlet, tighten to: 0,7
(9)Filtering cartridge: Not interchangeable
(10)Condenser outlet, tighten to: 0,6
(11)Pressostat, tighten to: 0,6
(12)Condenser inlet, tighten to: 0,6
(13)Buffer capacity
«a»Compressor front support: 3,9
«b»Compressor rear support: 2,5
AIR CONDITIONING SYSTEM R.134.a
C5HP1DRP
Engine: DT17BTED4
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