CO-4
COOLING SYSTEM Troubleshooting, Check and Replacement of Engine Coolant
HINT: Removal of the thermostat would have an adverse effect, causing a lowering of cooling efficiency. Do not re-
move the thermostat, even if the engine tends to overheat.
TROUBLESHOOTING
Engine overheats
Fan belt loose or missing
Dirt, leaves or insects on radiator or
condenser
Hoses, water pump, thermostat housing,
radiator, heater, core plugs or head gasket
leakage
Thermostat faulty
Injection timing retarded
Fluid coupling faulty
Radiator hose plugged or rotted
Water pump faulty
Radiator plugged or cap faulty
Cylinder head or block cracked or
plugged
Adjust or replace belts
Clean radiator or condenser
Repair as necessary
Check thermostat
Adjust timing
Replace fluid coupling
Replace hose
Replace water pump
Check radiator
Repair as necessary
CH-5
CO-12
CO-10
EM-24
CO-7
CO-7
CO-12
CHECK AND REPLACEMENT OF
ENGINE COOLANT
1. CHECK ENGINE COOLANT LEVEL AT RESERVOIR TANK
The coolant level should be between the "LOW" and
"FULL" lines.
If low, check for leaks and add coolant up to the "FULL"
line.
2. CHECK ENGINE COOLANT QUALITY
There should not be any excessive deposits of rust or scales
around the radiator cap or radiator filler hole, and the
coolant should be free from oil.
If excessively dirty, replace the coolant.
3. REPLACE ENGINE COOLANT
(a) Remove the radiator cap.
CAUTION: To avoid the danger of being burned, do
not remove it while the engine and radiator are still
hot, as fluid and steam can be blown out under pres-
sure.
(b) Drain the coolant from the radiator and engine drain
cocks.
(c) Close the drain cocks.
Torque (Engine drain cock):
250 kg-cm (18 ft-lb, 25 N-m)
CO0928
C00940
CO0942
Drain
Cock
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