1975 Citroen CX Cooling fan

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 640-00 : (:hnrnc-/eris/ics nrtd s.pcc-in/ ~bntttrcs of I/T<< nir- Op. ihA. 640-00 5
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VI. ClRdUlT DIAGRAM FOR dONiROL OF ELECTRIC COOLING FANS AND AIR-CONDITIONING SYSTEM
(-'/lo76 )
I
I L 64-4
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-
Air-conditioning
harness
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-1 Front
b 3
1
Engine
harness
VC -
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I KEY
I I
I
I- Standard wiring 1
17
/TTj I I
I -Air-conditioning 1
L2Ginq--~_J
Earth (front L.H. wheeiarch )
Earth on gearbox) 1
- Control relay for supplementary electric cooling fan
2 - Control relay for air blower
3 - Ambient thermostat ( located on evaporator )
4 - Air-conditioning switch ( on centre console )
5 - High pressure switch ( on de-watering tank )
6 - Electra-magnetic clutch for compressor
7 .
Electra-valve controlling fast idling speed, arid pneumatic recycling piston ( WEBER electro-valve )
8 - Control relay for supplementary electric fan for air-conditioning
9 - Control relay for electric cooling fan
lo.- Ignition coil 11
- Idling cut-out ( on carburettor ) 12
- Electric cooling fan 13
- Thermal switch for electric fan cut-in ( on radiator ) 14
- Supplementary electric cooling fan 15
- Air blower for air-conditioning 16
- Control resistors for air blower speeds 17
- Control for air blower ( three-speed )

Downloaded from www.Manualslib.com manuals search engine Operating principle :
Both electric fans ( 12) and ( 14) cool the engine coolant in the radiator. Electric fan ( 14) cools the condenser
when the compressor expels the air-conditioning cooling fluid under pressure.
Simultaneous supply to fans (12) and (14) :
This is carried out by means of contacts in relays ( 1 ) and ( 9). The fl ow of current in the energizinq winding of
relays ( 1 ) and ( 9) therefore operates both electric fans simultaneously.
The relay windings are supplied when
- ignition is switched on
*
thermal switch ( 13) controlled by the coolant temperature in the radiator is off. _-
Supply to supplementary electric fan ( 14) alone :
This is carried out by contacts in relay ( 8) when its energizing winding is supplied
The relay winding is supplied when
- ignition is on
- air-conditioning switch ( 4) is off
a
contact on the ambient temperature thermostat ( 3) is closed.
Supply to the electro-magnetic clutch for the compressor :
The clutch supply is a function of the following
- Air-conditioning switch (4)
- Ambient temperature thermostat ( 3 )
-
High pressure switch ( 5).
Supply to the blower ( 15) :
This is carried out by resistors ( 16) of the rheostat. This rheostat controls the speed of the blower ( 3-speed )
and consequently, the volume of displaced air.

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 640-00 : (hnrnct~~tis~ics md special jenttrrvs of the nir-
coi~ditiouing systcw. 1 Op. MA. 640-00
7
VII. WIRING DIAGRAMS FOR COOLING FAN AND AIR-CONDITIONING SYSTEM CONTROLS
7.; 1976 - Special features :
From 1977 models, the fast-idle electro-valve ( 9) is manufactured by (( PIERBLJRG )).
When it is not energized. the electro-valve lets low pressure through to.wards the carburettor capsule (fast-
idle ) I contrary to the (( WEBER )) electro-valve fitted previously.
Fitting the (( PIERBURG )) electro-valve necessitates fitting a relay (8) which is energized when the air-
conditioning system is operating. This relay with its N open )) contact cuts off supply to electro-valve ( 9)
which therefore produces fast-idle.
The rest of the operation is identical to the preceding diagram. DESCRIPTION OF COMPONENTS :
1
- Heater relay ( standard )
2 - Air blower ( Stmdnrd )
3 - Speed control for blower f Stnudnrd )
4 - Regulating thermostat
5 - Air-conditioning switch
6 - Pressure switch ( on dc-wnkrivg t~rrk ,)
7 - Compressor cl.utch
8 - Control relay for fast-idle electro-valve
9 - Fast-idle electro-valve
10 - Relay f0r’L.H. supplementary electric fan ( air-rorzditio)litlg J 11
i Supplementary L.H. electric fan ( cooliug )
12 - Relay for L.H. supplementary electric fan ( cooling ) 13
- Control thermostat ( on radiator ) for electric fans ( Standard ) 14
- Relay for R.H. electric fan ( Stmzdurd 1
15 - Electric cooling fan ( Stnrrdurd )
e
P.T.O.

Downloaded from www.Manualslib.com manuals search engine II. PRECAUTIONS TO BE TAKEN WHEN WORKING ON THE AIR-CONDITIONING SYSTEM
a) It is imperative to wear goggles
b ) Do not smoke R 12 fluid,in the presence of a flame turns into a toxic gas.
c) Never heat any section of the refrigerating system.
d) Never switch on the refrigerating system if both electric cooling fans are not connected
e ) Never check the compressor oil level without first having drained the refrigerating circuit.
f ) Never use any oil other than TOTAL (( LUNARIA 25 H, SUNISO No 5 or TEXACO CAPELLA (( E 1) grade 500
g ) Never use refrigerating fluid other than R.12.
NOTE Refrigerating fluid may- be sold under different names : FORANE (( 12 )), FLUGENE (( 12 ))! FREON ((12 ))
( the most important feature is the number (( 12 H which defines the fluid’s properties ).
IMPORTANT NOTES
A. The compressor
MUST NEVER b e switched on when the circuit has been drained of its refrigerating fluid.
during work ‘being carried out in the workshop. for example,. Indeed, in these conditions,
the compressor
would be functioning in air, and would deteriorate rapidly.
‘Consequently, in case of an exchange of compressor necessitating draining the system of its refrigerating
fluid, in a workshop not equipped with the necessary equipment for refilling ( SOGEV equipment )
IT IS
IMPERATIVE,
before driving the vehicle to another workshop equipped with the special equipment. to carry
out the following
- To leave the blanking plugs on the compressor. in order to avoid ingress of air ( the new compressor contains
refrigerating fluid ).
- To blank the intake and outlet hoses and to fix them tempororily.
- Todisconnect the supply lead to the electro-magnetic compressor clutch
( lead with white sleeve ).
NOTE : We remind you that if the circuit has been in contact with the atmosphere, it is necessary to replace
the de-watering tank, and the compressor oil.
B. Slight oil seepage is permissible at the front bearing of the air-conditioning compressor.
Compressors showing such a seepage, and being replaced OS a result, will not be accepted under warranty.
Ill. TIGHTENING TORQUES FOR THE UNIONS IN THE CIRCUIT :
( Oil the union threads with TOTAL LUNARIA 25 before fitting )
On the compressor Intake union : 5/8” 3.45 to 4.3,daNm ( 25 to 31 ft.lb )
Outlet union l/2”’ 2.9 to 3.75 daNm ( 21 to 27 ft.lb )
On the condenser Input union l/2” 4.85 to 5.5 daNm ( 35 to 39 3/4 ft.lb )
Output union : 3/ 8” 2.7 to 3.3 daNm ( 19 l/2 to 23 3/4 ft.lb )
On-de-watering tank : Unions : 3/8” 2.1 to 2.5daNm ( 15 l/4 to 18 ft.lb )
On : Input union evaporator : 3/8” 2.1 to 2.5 daNm ( 15 l/4 to 18 ft.lb )
Output union 5/8” 3.45 to 4.3 daNm ( 25 to 31 ft.lb )

Downloaded from www.Manualslib.com manuals search engine OPERATION No MA. 640.0 : ( h<,ck;ux n,,d od;es/ieg /he nir-~o,,di/io,,iri,~ Z\.SI<:IN Op. MA. 640-O
3
IV. FILLING THE REFRIGERATING CIRCUIT
using SOGEV equipment and a
PRESTOGAZ refill of R. 12
A. VEHICLES FITTED WITH A << ASPERA-FRIGO ,) COMPRESSOR
NOTE Equipment used for this operation :
a) SO(.I.,’ rori/<~iio,l Manufacturer Ets S.0.G.E.V
Avenue de 1 Atlantique Z.I. 91401 ORSAY -Tel. 907-64-00
b) I’Kli$ IoL:\/ ,v/i// o/ I?. II
1 kg refill supplied by the Replacement Parts Department under
ref. No.ZC 9 857 108 U.
IMPORTANT Precautions to be taken during this operation :
a) It is IMPERATIVE to wear goqqles.
b) Never smoke during the operation
R. 12 fluid turns into a toxic gas in the presence of LI flame
c) Never heat any port of the refriqerotinq circuit.
d) Never switch on the air-conditioninq system if either of the cooling fans are disconnected. 1. Drain the circuit :
NOTE
- This operation must be carried out in a well-
ventilated room.
- The refriqerating circcit must be drained before
any work can be carried out on it.
a) Remove pluq (7 ) from compressor intake valve
and connect in its place ( at (/ a /) ) flexible
pipe (4).
b) Remove pluqs ( 1 ) protecting adjustment screws
( 2 ) and ( 3 ) for the valves.
c ) Check tops ( 5) and (6 1 are properly closed
and screw in screw ( 3 1 two turns.
d) Place taps ( 5) and (6 ) in an open container
in order to contain the fluid, and to ovoid it
turning into mist. Open the taps. Close them
when draininq is complete ( when the hissing
produced by the escaping gas has stopped 1.
e) Proceed in the same tn(mner once flexible
pipe ( 4) is connected to the outlet valve, and
screw ( 2 ) is screwed in two turns.