engine MITSUBISHI ECLIPSE 1991 Repair Manual

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.

COOLING - Service Adjustment Procedures7-9Alterhatorpulley
6COOOO9
Spindle
l-
(1) Place straight edge as shown in the illustration.(2) Measure the deflection with a force of 100
N(22lb4applied to belt mid-point between water pump pulley and
alternator pulley. If the standard value is not obtained, make
adjustment.Standard
value:
<I .8L Engine>8.0-11.0 mm (.315-433 in.)
<2.0L DOHC Engine> 9.0-I 1.5 mm (.354-.453 in.)(3) Use a tension gauge to check the belt tension. If the
standard value is not obtained, make adjustment.
When tension gauge is used, the tension may be measuredbetween any two pulleys.Standard
value: 250-500 N (55-110 Ibs.)
IncorrectCorrectIncorrect
6COO37-ALTERNATOR/WATER PUMP DRIVE BELT TEN-
SION ADJUSTMENT
ruo7FFAl
Caution
Excessive belt tension will cause damage to alternator and
water pump pulley bearings, while on the other hand,
loose belt tension will produces slip.
Therefore, be sure to adjust the belt tension to proper
value.
<I .8L Engine>
(1) Loosen the nut on the alternator support bolt.
(2) Loosen the alternator brace bolt.
(3) Make sure that the belt is properly installed in pulley
groove.

COOLING - Service Adjustment Procedures100N
(22 Ibs.)
DeflecAlternator
ypulley
:tion
6COOOO9
Spindle ,
HookOlLO149
IncorrectCorrectIncorrect
6COO37-(4) Move the alternator to adjust so that the amount of
deflection is the standard value.Standard
value:
New belt6.5-8.0 mm (.256-.315 in.)
Used belt9.5 mm (.374 in.)(5) On using tension gauge, move the alternator to adjust
deflection to standard value.Standard
value:
New belt600flOO N (132+22 Ibs.)
Used belt400 N (88 Ibs.)(6) After completion of adjustment, tighten alternator brace
bolt and alternator brace bolt nut to the specified torque.
(7) If new belt has been installed, run engine for more than 5
minutes.Then follow “V-RIBBED BELT DEFLECTION CHECK”
procedure to make sure that the belt has proper deflection.
<2.0L DOHC Engine>
(1) Loosen the alternator pivot nut.
(2) Loosen the belt tension adjuster lock bolt.
(3) Release tension by rotating the adjuster bolt counterclock-
wise.(4) Remove and install the alternator and water pump drive
belt.(5) Make sure the V-ribbed type drive belt is properly installed
in pulley grooves.

COOLING - Service Adjustment Procedures7-m
1(6) Adjust belt deflection by tightening adjust bolt.
:Turn adjuster bolt clockwise to increase the belt tension
and turn adjuster bolt counterclockwise to decrease the
belt tension.
Standard value:
New belt7.5-9.0 mm (.295-.354 in.)
Used belt10.0 mm (.394 in.)(7) On using tension gauge, move the alternator to adjust
deflection to standard value.
Standard value:
New belt600+100 N (132f22 Ibs.)
Used belt
400 N (88 Ibs.)(8) Tighten in order, first, adjuster lock bolt then alternator
pivot nut to the specified torque.
(9) If new belt has been installed, run engine for more than 5
minutes. Then follow “DRIVE BELT TENSION INSPEC-
TION” procedure to make sure that the belt has proper
tension and readjust if necessary.

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
<Turbo>@Removal of Air Cleaner BracketORefilling of the Engine Coolant(Refer to GROUP 11 -Air Cleaner.)(Refer to GROUP O-Maintenance<Turbo>Service.)*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 hoses<Vehicles with Non-Turbo (A/T)>9. Therm0 sensor connectorIO. Radiator fan motor connector
11. Condenser fan motor connector<Vehicles with air conditioner>12. Upper insulator
04AOOS7
07A0049
13. Radiator assembly14. Condenser fan motor assembly<Vehicles with air conditioner>15. 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”

7-14COOLING - Radiator
A
OFF
ON
h
--- ,
BWatertemperature
16v1100
Standard value:Continuity
at 82-88X (180-190°F). . . . . . . . . . .at A pointNo continuity at
78°C (172°F) or less . . . . . . . . at 6 point.r;;;
RADIATOR FAN MOTOR RELAY INSPECTION
(1) Remove radiator fan motor relay from the relay box locatedat the right side in the engine compartment.
16LO312
1Mating marks(2) Check for continuity between the terminals when the
battery power-supply is applied to terminal 0, and terminal
@ is grounded.
When currentBetween
flowsterminals l-3Continuity
When no
current flowsSERVICE POINTS OF
JNSTALLATIONNOMDAF
7. INSTALLATION OF RADIATOR LOWER HOSE/
6. RADIATOR UPPER HOSEAlign the mating marks on the radiator hose and hose
clamp and then connect them; then, applying force in the
direction indicated by the arrow in the illustration, seat the
~
1clamp to the trace marks of the previous connection.Caution
Be sure to install the hose clamps at the trace marks ofthe
previous connection.

7-16COOLING - Thermostat
INSPECTIONy+w
l Check that valve closes tightly at room temperature.
l Check for defects or damage.
l Check for rust or encrustation on valve. Remove if any.
l Immerse thermostat in container of water. Stir to raise
water temperature and check that thermostat opening
valve temperature and the temperature with valve fully
open [valve lift-over 8 mm
(.31 in.)] are at the standard
value.Standard
value:Opening
valve temperature
Full-open temperature
88°C ( 190°F)
100°C (212°F)
Fullyclosedpositionve lift
04UOO18<1.8L Engine><2.0L DOHCEngine:
IMating
marks
NOTEMeasure valve height when fully closed. Calculate lift by
measuring the height when fully open.
SERVICE POINTS OF INSTALLATIONNOlGEAG
6. INSTALLATION OF THERMOSTAT
Install the thermostat so that the flange fits perfectly to the
recessed seat of the thermostat or thermostat housing.
2.CONNECTION OF RADIATOR UPPER HOSEAlign the mating marks on the radiator hose and hose
clamp and then connect them; then, applying force in the
direction indicated by the arrow in the illustration, seat the
clamp to the trace marks of the previous connection.
Caution
Be sure to install the hose clamps at the trace marks ofthe
previous connection.
04A0099 )

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”.

7-18COOLING - Water Pump <1.8L Engine>
lo-12 Nm7-9 ft.lbs.OlA05813
17
Removal steps
12. Spark plug cable+e l 4 13. Rocker cover14. Rocker cover gasket
l + 15. Semi-circular packing~~ e+ 16. Timing belt front upper coverl
17. Timing belt front lower cover+e l 18. Timing belt19. Crankshaft sprocketl 20. Flange21.
Timing belt B tensionerl I) ~~ 22. Timing belt B23.
Alternator bracel + 24. Water pump25.
Water pump gasketl + 26. O-ring
NUlt(I) Reverse the removal procedures to reinstall.(2) ** : Refer to “Service Points of Removal”.(3) l 4 : Refer to “Service Points of Installation”.(4) m : Non-reusable parts