Mitsubishi 380. Manual - part 238

THERMOSTAT

ENGINE COOLING

14-36

14. ENGINE COOLANT 

TEMPERATURE SENSOR 
CONNECTOR

15. CAPACITOR CONNECTOR
16. CAMSHAFT POSITION SENSOR 

CONNECTOR

17. INHIBITOR SWITCH SENSOR 

CONNECTOR

18. A/T CONTROL SOLENOID VALVE 

ASSEMBLY CONNECTOR

19. OUTPUT SHAFT SPEED 

SENSOR CONNECTOR

20. INPUT SHAFT SPEED SENSOR 

CONNECTOR

REMOVAL STEPS (Continued)

AC306959AB

19 ± 1 N·m
14 ± 1 ft-lb

21

22

23

REMOVAL STEPS

<<A>>

>>B<<

21. RADIATOR LOWER HOSE 

CONNECTION

22. WATER INLET FITTING

>>A<<

23. THERMOSTAT

REMOVAL STEPS (Continued)

THERMOSTAT

ENGINE COOLING

14-37

REMOVAL SERVICE POINT

.

<<A>> RADIATOR LOWER HOSE DISCONNEC-
TION

Make mating marks on the radiator hose and the hose clamp. 
Disconnect the radiator hose.

INSTALLATION SERVICE POINTS

.

>>A<< THERMOSTAT INSTALLATION

CAUTION

Make absolutely sure that no oil adheres to the rubber ring 
of the thermostat. Also do not fold or scratch the rubber 
ring during installation.
Install the thermostat so that the jiggle valve is facing straight 
up. Be careful not to fold or scratch the rubber ring.

.

>>B<< RADIATOR LOWER HOSE CONNECTION

1. Insert each hose as far as the projection of the water inlet 

fitting.

2. Align the mating marks on the radiator hose and hose 

clamp, and then connect the radiator hose.

AC200641AB

MATING MARKS

AC000279

JIGGLE VALVE

RUBBER RING

AB

AC200642

MATING
MARKS

PROJECTION

WATER INLET 
FITTING 

AE

THERMOSTAT

ENGINE COOLING

14-38

INSPECTION

M1141002500450

.

Thermostat Check

1. Immerse the thermostat in water, and heat the water while 

stirring. Check the thermostat valve opening temperature.

Standard value:

Valve opening temperature:

88 

± 1.5°C (190 ± 3°F)

2. Check that the amount of valve lift is at the standard value 

when the water is at the full-opening temperature.

NOTE: Measure the valve height when the thermostat is 
fully closed, and use this measurement to compare the 
valve height when the thermostat is fully open.

Standard value:

Full-opening temperature:

100

°C (212°F)

Amount of valve lift:

9.0 mm (0.35 inch) or more

ACX00400

ACX00401AB

VALVE LIFT

WATER PUMP

ENGINE COOLING

14-39

WATER PUMP

REMOVAL AND INSTALLATION

M1141002700498

INSTALLATION SERVICE POINT

.

>>A<< O-RING INSTALLATION

CAUTION

Do not let the O-ring get contaminated with grease or 
engine oil.
Fit the O-ring into the groove of the water pipe ends, and apply 
water or coolant to the circumference of the O-ring and the pipe 
bores to insert the pipe assembly.

Pre-removal and Post-installation Operation
• Engine Coolant Draining and Refilling (Refer to 27).
• Timing Belt Removal and Installation (Refer to GROUP 

11C, Timing Belt 

11A-46

).

• Crankshaft Position Sensor Removal and Installation 

(Refer to GROUP 16, Crankshaft Position Sensor 35).

AC205662

24 ± 3 N·m
18 ± 2 ft-lb

42 ± 8 N·m
31 ± 6 ft-lb

24 ± 3 N·m
18 ± 2 ft-lb

1

2

3

4

N

N

AB

BOLT SPECIFICATIONS

THREAD DIAMETER × LENGTH mm(in)

10 × 38
(0.4 × 1.5)

8 × 25
(0.3 × 1.0)

8 × 25
(0.3 × 1.0)

8 × 20
(0.3 × 0.8)

REMOVAL STEPS 

1.

WATER PUMP BRACKET

2.

WATER PUMP

3.

WATER PUMP GASKET

>>A<<

4.

O-RING

REMOVAL STEPS  (Continued)

AC200644 AB

O-RING

WATER PIPE