Thermostat: Removal - Refitting; Coolant Pump - Renault Laguna III Manual

Thermostat: Removal - Refitting
M4R
Special tooling required
Mot. 1448 Remote operation pliers for
hose clips.
Tightening torquesm
coolant inlet union bolts
The M4R engine has a double cooling circuit and is fit-
ted with two thermostats: one at the coolant pump and
the other on the water chamber.
IMPORTANT
When working in the engine compartment, take
care as the radiator fan(s) may start up unexpect-
edly (risk of being cut).
To avoid any risk of serious burns when the engine
is hot:
- do not open the expansion bottle cap,
- do not drain the cooling system,
- do not open the bleed screw(s).
WARNING
When carrying out a repair that requires a complete
change, it is essential to flush the circuit with clean
water, blast compressed air through the circuit to
drive out the water, fill and bleed the circuit and
then measure the effective protection.
The criteria to be met are:
- protection down to -25˚C ± ± ± ± 2 for cold and temper-
ate countries,
- protection down to -40˚C ± ± ± ± 2 for very cold coun-
tries.
WARNING
Prepare for the flow of fluid, and protect the sur-
rounding components.
COOLING
REMOVING THE THERMOSTAT AT THE

COOLANT PUMP

I - REMOVAL PREPARATION OPERATION
a Position the vehicle on a two-post lift (see Vehicle:
Towing and lifting) (MR 415, 02A, Lifting equip-
ment).
a Remove:
17 Nm
- the engine cover,
- the engine undertray bolts,
- the engine undertray.
a Drain the cooling system (see 19A, Cooling, Cool-
ing system: Draining - Refilling, page 19A-16) .
II - OPERATION FOR REMOVAL OF PART
CONCERNED
a Remove the clip (1) from the coolant inlet union hose
using the tool (Mot. 1448).
a Disconnect the hose (2) from the coolant inlet union.
19A-89
19A
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