engine coolant RENAULT SCENIC 2000 J64 / 1.G Technical Note 3426A User Guide

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Exhaust gas recirculation
14
14-3
OPERATING PRINCIPLE
The valve is controlled by an RCO signal issued by the
injection computer. The RCO signal permits
modulation of the opening of the valve, and
consequently, the quantity of exhaust gas directed
back towards the inlet manifold.
The computer continuously carries out a test to detect
the position of the EGR valve flap.
OPERATING CONDITIONS
The parameters which determine the actuation of the
EGR valve are as follows:
– the coolant temperature,
– the air temperature,
– the air pressure,
– the accelerator pedal position,
– the engine speed.
The EGR function is cut if:
– the battery voltage is less than 9 volts,
– the engine speed is greater than 3000 rpm.,
– a characteristics map (engine speed/load) exceeds a
given threshold,
– the vehicle speed is less than 12 km/h, the engine
speed is less than 1000 rpm and if the coolant
temperature is greater than 60 ˚C for 40 seconds.
The EGR valve is not supplied after engine start
according to a coolant temperature characteristics
map.
time (s)The electric EGR valve is supplied for 40 seconds on
each return to idling speed if the air temperature is
greater than 15 ˚C.
Coolant
temperature (˚C)
15761R
1
2
4
5
6Solenoid supply
Sensor supply
Sensor earth
Solenoid earth
Sensor output
-20 0 17 20

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Filling and bleeding
19
119 COOLING SYSTEM
Filling and bleeding
There is no heater matrix water control valve.
Water flow is continuous in the heater matrix, which
contributes to the cooling of the engine.
FILLING
It is essential to open the bleed screw on the
cylinder head coolant pipe housing outlet.
Fill the circuit through the expansion bottle opening.
Close the bleed screw as soon as the fluid runs out in
a continuous jet.
Start the engine (2500 rpm).
Adjust the level by overflow for a period of about
4 minutes.
Tighten the expansion bottle cap.
BLEEDING
Let the engine run for 20 minutes at 2500 rpm, until
the engine cooling fan operates (time required for
automatic degassing).
Check the liquid level is at the "Maximum" marker.
DO NOT OPEN THE BLEED SCREW(S) WITH THE
ENGINE RUNNING.
REFIT THE EXPANSION BOTTLE CAP WHILE THE
ENGINE IS WARM.
19-1

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Thermal plunger unit
19
19-3
Thermal plunger unit
REMOVAL
Put the vehicle on a 2 post lift.
Disconnect the battery.
Remove the engine undertray.
Position the hose clips at the inlet and outlet of the
thermal plunger mounting unit (plugs).
Disconnect the hoses on this unit.
Remove the mounting bolt for the thermal plunger
support unit as well as the supply wires and remove
the unit.
REFITTING
The plugs are tightened in the usual fashion.
Refitting is the reverse of removal.
Top up the coolant and bleed the cooling circuit (see
section 19 "Filling - bleeding"). SPECIAL TOOLING REQUIRED
Mot. 453 -01
Mot. 1202
Mot. 1448Hose clamp pliers set
Hose clip pliers
Long nose pliers for hose clips
TIGHTENING TORQUES (in daN.m)
Thermal plungers 2

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Water pump
19
19-5
Water pump
REMOVAL
Put the vehicle on a two post lift.
Disconnect the battery.
Remove the engine undertray.
Drain the cooling circuit through the lower radiator
hose.
Unclip the diesel filter and remove it.
Remove:
– the front right wheel along with the mudguard,
– the style cover,
– the accessories belt (see Section 07 "Accessories
belt tension"),
– the coolant pump and power assisted steering pump
pulleys,
– the water pump.Cleaning
It is very important not to scratch the gasket faces.
Use the Décapjoint product to dissolve any part of the
gasket which remains attached.
Wear gloves whilst carrying out the following
operation.
– Apply the product to the parts to be cleaned; wait
about ten minutes, then remove it using a wooden
spatula.
Do not allow this agent to drip on to the paintwork.
REFITTING
Refit:
– the water pump (fitted with a new gasket), tightening
the bolts to a torque of 1.7 daN.m,
– the accessories belt and tension it (see section 07
"Accessories belt tension").
Fill and bleed the cooling circuit, (see section 19
"Filling and Bleeding"). SPECIAL TOOLING REQUIRED
Mot. 1202 -01
Hose clip pliers
Mot. 1202 -02
Mot. 1448 Long nose pliers for hose clips
TIGHTENING TORQUES (in daN.m)
Water pump bolts 1.7