coolant MITSUBISHI ECLIPSE 1991 User Guide

COOLING - Troubleshootina7-5
TRO,UBLESHOOTlNG
Symptom
OverheatProbable causeInsufficient engine coolant
Too high an anti-freeze concentrationRemedy
Replenish
Correct anti-freeze
concentration
Loose or broken drive belt
Replace
Inoperative electric cooling fan
Faulty thermosensor
Replace
Faulty electrical motorReplace
Faulty radiator fan relayReplace
Damaged or blocked (insufficiently ventilated) radiator finsCorrect
Water leaks
Damaged radiator core joint
Replace
Corroded or cracked hosesReplace
(radiator hose, heater hose, etc.)
Loose bolt or leaking gasket in water outlet fitting
(thermostat)
Loose water pump mounting bolt or leaking gasket
Faulty cap valve or setting of spring
Loose intake manifold bolts or leaking from gasket
Cracked intake manifold
Faulty automatic transaxle oil cooler operation
Blocked or collapsed hose and pipe
Loose hose and pipe connection
Faulty thermostat operation
Faulty water pump operation
Water passage clogged with slime or rust deposit or
foreign substanceCorrect or replace
Correct or replace
Replace
Retorque bolts or replace
gasket
Replace
Replace
Correct
Replace
Replace
Clean
Jo rise in temperatureFaulty thermostatReplace

COOLING - Troubleshooting7A7
OPERATION
1. When the output of the air conditioner*--control unit is “LO” (OV)(when the
compressor magnet clutch isdeenergized)
l When the ignition switch is at “ON” , and if
engine coolant temperature rises to
85°C
(185”F), the thermosensor contacts close,
causing current to flow through the radiator
fan motor relay (coil), thermosensor and
ground, causing the radiator fan motor relay
contacts to close.
l Current flows through the radiator fan motor
relay contacts, radiator fan motor and ground,causing the radiator fan motor to rotate.
2. When the output of the air conditioner
control unit is “HI” (approx. 12V)(when the
compressor magnet clutch is
energized)l If the therm0 sensor is “ON” when the
engine coolant temperature exceeds
85°C
(185°F). the condenser fan motor control relay
is also “ON”, thus the condenser fan as well
as the radiator fan start rotating at a high
speed.
TROUBLESHOOTING HINTS
1. Neither the radiator fan nor condenser fanrotate at
all.l Check sub fusible link
No.3.
2. Only the condenser fan does not operate.l Check dedicated fuse
No.5.
3. The radiator fan and condenser fan do notoperate
in the low speed mode, but operateotherwise.
(1)The A/C compressor magnet clutch does not
enter the “ON” state.
l Check whether the output of the air con-
ditioner control unit is available.
NOTEFor troubleshooting of the air conditioner
control unit, refer to GROUP 24.
(2)The A/C compressor magnet clutch enters
the “ON” state.
l Check the resistor.Conditions
under which the Air Conditioner Control Unit Outputs a “HI” Signal
Ignition switch (IG2)
Blower switchAir conditioner switch
Compressor magnet clutch
ON
ON
ON
ON
Remarksl If any of the switches and sensors is OFF,
the air conditioner control unit will
output a “LO” signal (OV).
Fan Operating Mode
Switch conditions
Air conditioner switch
Therm0 sensor
LO
(OV)OFFLO
(OV)ONHI
(12V)OFFHI
(12V)ONFan rotating condition
Cooling (radiator) fanCondenser fan
OFFOFF
HIGHOFF
LOWLOW
HIGHHIGH
NOTE
_-The therm0 sensor is ON when the temperature reaches 85°C (185°F) or more.

7-8COOLING - Service Adjustment Procedures
04DooE
SERVICE ADJUSTMENT PROCEDURESENGINE COOLANT LEAK CHECK
NO7FAAE1. Loosen cap.
2.Confirm that the engine coolant level is up to the filler neck.3. Install a adapter to the water outlet fitting and apply
160
kPa (23 psi) pressure. Hold pressure for tvvo minutes, whilechecking for leakage from the radiator, hose or connec-
tionsCaution
Be sure to completely clean away moisture from the
places checked.When the tester
is removed, be careful not to spill anyengine coolant from
it.
Be careful, when installing and removing the tester andwhen testing, not
to deform the water outlet fitting.
4. If there is leakage, repair or replace the appropriate part.
CAP PRESSURE TESTNO’IFBAG
1. Use a special tool to attach the cap to the tester.
2.Increase the pressure until the indicator of the gauge stops
moving.Limit:
65 kPa (9.2 psi)Standard value:
75-105 kPa (11-15 psi)
3.Replace the cap if the reading does not remain at or abovethe limit.
NOTEBe sure that the cap is clean before testing, since rust or
other foreign material on the cap seal will cause an
improper indication.
ENGINE COOLANT REPLACEMENTRefer to GROUP O-Cooling System.NO’IFCACENGINE COOLANT CONCENTRATION
TESTmAGRefer to GROUP O-Selection of Engine Coolant.
ALTERNATOR/WATER PUMP DRIVE BELT TEN-
SION INSPECTION
NO7FEAGCaution
If the belt slips or squeaks, check the belt tension and also
check the belt for wear, damage and breakage and checkthe
pulleys for damage.

7-12COOLING - Radiator
RADIATORPre-removal Operation
@Draining of the Engine Coolant(Refer to GROUP O-Maintenance(Refer to GROUP II-Air Cleaner.)
Service.)
I I
@Removal of Air Cleaner BracketORefilling of the Engine Coolant(Refer to GROUP 11 -Air Cleaner.)(Refer to GROUP O-MaintenanceService.)*Checking Automatic Transaxle FluidLevel and Refilling If Necessary
9-14 Nm
_
4-6 Nm3-4 ft.lbs.Removal steps
1 Drain plug2. Cap3. Overflow tube.
4-9 Nm3-4 ft.lbs.
4. Water level switch connector
5. Reserve tank~~ l +6. Radiator upper hose
+e e+ 7. Radiator lower hose
*I)8. Automatic transaxle oil cooler hoses9. Therm0 sensor connectorIO. Radiator fan motor connector
11. Condenser fan motor connector12. Upper insulator
04AOOS7
07A0049
13. Radiator assembly14. Condenser fan motor assembly15. Radiator fan motor assembly
16. Thermosensor
17. Lower insulator
NOTE(1) Reverse the removal procedures to reinstall.(2) +e : Refer to “Service Points of Removal”.(3) l + : Refer to “Service Points of Installation”

COOLING - Water Pump <1.8L Engine>
WATER PUMP 4.8L Engine>
7-17
- REMOVAL AND INSTALLATION
c.
-_*Draining of
the Engine Coolant(Refer to GROUP O-Maintenance
Post-installation Operation
l installation of the Under Cover@Supplying of the Engine Coolant(Refer to GROUP O-MaintenanceService.)@Engine Adjustment(RR:; to GROUP g-Engine Adjust-
8-10 Nm6-7 ftlbs.
48NOlMB-A
30-40 Nm
22-2g Fbs.
0
60-80 Nm43-58 ft.lbs.5-18
Nm1-13 ft.lbs.18-22 NmRemoval steps13-15 ft.lbs.
1. Clamp part of hoses (Power steering)4+2. Engine mount bracketl +3. Drive belt (Air conditioner)I)+ 4. Drive belt (Power steering)
4+ l + 5. Drive belt
7. Water pump pulleyWater pump pulleyDamper pullevAdapter. ’Crank shaft pulley.
OlAO566
(Powersteering)
6. Tension tx~llev bra&&I\lnTFr--‘--I -‘--‘.--I.VIL(I) Reverse the removal procedures to reinstall.I?\ CI Refer tn “Smvirr rh:-*- -‘ D---./al”,\-, --. I.VIw, .”..-..,u; r”llllb “I “allI”\(3) +4 : Refer to “Service Points nf Instalk_ - .,.__ -. _.._ .-Jion”.

COOLING - Water Pump <2.0L DOHC Engine>7-21WATER PUMP <2.0L DOHC Engine>
--- REMOVAL AND INSTALLATION
No7Ms-B
_Pre-removal Operation
@Removal of the Under Coverl Draining of the Engine Coolant(Refer to GROUP O-MaintenanceService.)
50-65 Nm136-47 ft.lbs.
60-60 Nm
Post-installation Operation
l installation of the Under Coverl supplying of the Engine Coolant(Refer to GROUP O-MaintenanceService.)*Engine Adjustment
(Ri+&; to GROUP g-Engine Adjust-
lo-12 Nm
7-9 ft.lbs. 43-5
31-4
III-40 Nm!-29 ft.lbs.17-26
12-19OlAO560
20-27 Nm14-20 ft.lbs.
23-27 Nm
17-20 ft.lbs.
”20-’ 30 Nm” .““*wY--
-~ . .14-22 ft.ll3s.Removal steps
I. Clamp part of hoses (Power steering)
+*2. Engine mount bracket
l + 3. Drive belte+ 4. Drive belt (Power steering)5. Tension pulley bracket
I)4 6. Drive belt (Air conditioner)7. Water pump pulley
8. Water pump pulley (Power steering)
9. Crankshaft pulley
l + 10. Timing belt upper coverI)4 11. Timing belt lower cover+I) l + 12. Automatic tensioner13. Tensioner pulley
+I) l + 14. Timing belt
NOTE(1) Reverse the removal procedures to reinstall.(2) +e : Refer to “Service Points of Removal”.(3) l 4 : Refer to “Service Points of Installation”
,“k.

7-28COOLING- Water Hose and Water Pipe <2.0L DOHC Engine (Non-Turbo)>
<2.0L DOHC Engine (Non-Turbo)>
REMOVAL AND INSTALLATION
Post-installgtion Pperation@Supplying of the Engine Coolant(FF$efeet; GROUP O-Maintenance
6
/5
/l--5ia
225-30 Nm
18-22
ft.lbs.
12-1s Nrn9-11 ft.lbs.
Removal steps1 Air intake hose
2. Condenser fan motor assembly
3. Self-locking nut4. Gasket
5. Oxygen sensor harness connector
6. Exhaust manifold cover (A)7. Self-locking nut
8. Engine hanger
04A01059. Exhaust manifold
10. Exhaust manifold gasket11. Exhaust manifold cover(B)
NOTE(1) Reverse the removal procedures to reinstall.(21 m : Non-reusable parts

COOLING -Water Hose and Water Pipe <2.0L DOHC Engine (Turbo)>7-31WATER HOSE AND WATER PIPE
7--<2.0L DOHC Engine (Turbo)>
REMOVAL AND INSTALLATION
N071A-C
. .
ation OperationPost-installi@Filling of the Engine Oil(Refer to GROUP g-EngineaFilling of the
Engine Coolant(Refer to GROUP 7-ServiceAdjustment Procedures.)
Pre-removal OperationeDraining of the Engine Coolant(Refer to GROUP 7-ServiceAdjustment Procedures.)*Draining of the Engine Oil(Refer to GROUP g-Engine
25-30 Nm
18-22 ftlbs.4n-47 ft.lbs.
w35-45 N/m12-15 Nm25-33 ft.lbs.
9- 11ft.lbs.----Q&Removal steps
1. Condenser fan motor assembly2. Oxygen sensor harness connector3. Engine oil level gauge guide4. O-ring5. Connection for air intake hose6. Connection for vacuum hose7. Connection for air hose A8. Connection for vacuum hose9. Heat protector A10. Heat protector B
4*11. Power steering oil pump
12. Oil pump bracket
13. Self-locking nut
14. Engine hanger22-29
ft.lbs. 29-43 ft.lbs.
15. Eye bolt16. Gasket17. Connection for water hose
I)+ 18. Connection for water pipe B19. Self-locking nut20. Gasket21. Exhaust manifold22. Exhaust manifold gasket
23. Ring
24. Gasket
05m154

7-34 COOLINGWater Hose and Water Pipe <2.0L DOHC Engine (Turbo)>/Engine Coolant Temperature- Gauge Unit. Engine Coolant Temoerature Sensor and Enoine Coolant Temoerature Switch
05A0026
05K55734. INSTALLATION OF WATER HOSE
Install the water hose with the longer straight area
positioned on the turbo side.
27. INSTALLATION OF TURBOCHAGER ASSEMBLY
Clean the alignment surfaces shown in the illustration.
Caution
When cleaning, care must be taken so that a piece of
the gasket does not enter the oil passage hole.
18. INSTALLATION OF WATER PIPE
(B)Before installing to the water inlet pipe, apply machine oil to
the inner surface of the pipe flare.
ENGINE COOLANT TEMPERATURE GAUGE UNIT, ENGINE COOLANT
TEMPERATURE SENSOR AND ENGINE COOLANT TEMPERATURE
SWITCHREMOVAL AND INSTALLATION
N070%-
Pre-removal Operation
*Draining of the Engine Coolant
(Refer to GROUP O-Maintenance
Service.)@Supplying of the Engine Coolant
(Refer to GROUP O-Maintenance
< 1.8L Engine>
20-4014-291
’lo-12 Nm7-9 ft.lbs.04AOO99<2.0L DOHC Engine>10112 Nm
7-9 ft.lbs.
Removal
l +1. Engine coolant temperature gauge unit
++ 2. Engine coolant temperature sensor
(Engine control)
*4 3. Engine coolant temperature switch(Air conditioner)
NOTEl a : Refer to “Service Points of Installation”.

COOLINGEngine Coolant Temperature Gauge Unit, Engine Coolant- TemDerature Sensor and Enaine Coolant Temperature Switch7-35
.---
Sensor04GO033
0400032
1c0010
INSPECTIONNomDM3ENGINE COOLANT TEMPERATURE GAUGE UNIT
Raise the water temperature and measure the resistance if
within the standard value.
Standard value:
104213.5 52 [at 70°C (158OF)lENGINE COOLANT TEMPERATURE SENSOR
(Engine control)
Raise the water temperature and measure the resistance if
within the standard value.
Standard value:
At
20°C (68°F)2.45 + 0.24 k&
At
80°C (176°F)296f32 8ENGINE COOLANT TEMPERATURE SWITCH
(Air conditioner)
(1) Immerse the engine coolant temperature switch in oil and
then heat (by using a gas stove flame or similar method) soas to increase the oil temperature.
(2) Check to be sure that the engine coolant temperature
switch is switched OFF when the oil temperature reaches
the standard value.
Standard value:
112-l 18°C (234-244°F)Caution
The oil used above should be engine oil and should be
stirred well while being heated; do not heat more than
necessary.SERVICE POINTS OF INSTALLATION
NO7OEAU3. ENGINE COOLANT TEMPERATURE
SWITCHI2.ENGINE COOLANT TEMPERATURE SENSOR/l. EN-
GINE COOLANT TEMPERATURE GAUGE UNIT
Apply sealant to threaded portion and tighten.
Specified sealant: MOPAR Part No.4318034 or equiva-
lent