cooling CITROEN C6 2005 User Guide

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INJECTION
BOSCH ME 7.4.7 INJECTION SYSTEM
Engine: ES9A
Synopsis.
(15) Canister purge electrovalve
(16)Cooling fan
(17)Pencil type ignition coil (x6)
(18)Petrol injector (x6)
(19)Variable timing electrovalve (x2)
(20)Downstream oxygen sensor (x2)
(21)Upstream oxygen sensor (x2)
(22)Engine coolant temperature sensor
(23)Knock sensor (x2)
(24) Power steering pressure sensor
(25)Integrated pressure sensor
(26)Accelerator pedal position sensor
(27)Inlet air temperature sensor
(28)Diagnostic connector
(29)Ignition injection ECU
B1HP1Z9P
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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
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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