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3.4
Cooling system (liquid-cooled engine)
4 Thermostat
-
%
removal, check and installation
%
%
Removal
Warning: The engine must b e
completely cool before carrying
out this procedure.
1
The thermostat is automatic in operation and
should give many years service without requiring
attention. In the event of a failure, the thermostat
valve will probably jam open, in which case the
engine will take much longer to reach its normal
operating temperature, resulting in increased
fuel consumption. If the valve jams shut, the
coolant will be unable to circulate and the engine
will overheat with the risk of seizure. In either
case, if the thermostat is found to be faulty, a
new unit should be fitted immediately.
2 The thermostat is located in the front of the
cylinder head. Remove the head, the
thermostat and the thermostat spring (see
Chapter 28, Section 7).
3 Examine the thermostat visually before
carrying out the test. If it remains in the open
position at room temperature (20°C approx-
imately), it should be renewed.
Check
4 Fill a small, heatproof container with cold
water and place it on
a
stove. Using a piece of
wire, suspend the thermostat in the water
(see illustration). Heat the water and see
whether the thermostat opens. Peugeot do
not specify the temperature at which the
thermostat should open. If it has not opened
by the time the water starts to boil, it is faulty
and must be replaced.
5 Inspect the thermostat spring and replace it
with a new one if it is corroded or damaged.
lnstallation
6 Install the thermostat, its spring and the
cylinder head as described in Chapter 28,
THERMOMETER
THERMOSTAT
u
4.4 Set-up for testing the thermostat
Section 7. On completion, refill the cooling
ln~tallation
system as described in Section 2.
4 Installation is the reverse of removal. Make
sure the hoses are correctly installed and
5 Coolant reservoir
-
secured with their clips. On completion, refill
removal and installatic
the reservoir with the proper coolant mixture
(see Daily @re-ride) checks)
,
fit the cap and
the panel.
Removal
Warning: Ensure that the engine
i s c o l d before working on the
coolant reservoir.
1 The coolant reservoir is located behind the
headlight panel. Remove the panel for access
(see Chapter 7).
2 Remove the reservoir cap and position a
suitable container beneath the water pump on
the right-hand side of the engine. Loosen the
clip securing the coolant hose from the
radiator to the pump, then detach the hose
and drain enough coolant to empty the
reservoir (see Section 2). Reconnect the hose
and secure it with the clip.
3 Loosen the clips securing the hoses to the
reservoir and detach the hoses, then undo the
reservoir mounting screw and remove the
reservoir (see illustration).
m
6 Radiator-
removal and installation
Removal
Warning: Ensure that the engine
i s cold before working on the
radiator.
1 The radiator is located behind the headlight
panel. Remove the panel for access and
remove the right-hand side panel (see
Chapter 7).
2 Drain the cooling system (see Section 2).
3 Loosen the clips securing the coolant hoses
to the radiator and detach the hoses (see
illustration). Loosen the clips securing the
coolant reservoir hoses to the radiator and
detach the hoses (see illustration 5.3).
5.3 Detach the hoses (A) and (B) from the reservoir then undo the
6.3 Radiator coolant hoses (A) and (B) and mounting bolts (C)
mounting screw (C)
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