Troubleshooting; Check And Replacement Of Engine Coolant - Toyota 3b Repair Manual

co-4 COOLING SYSTEM
-
Troublesnooting,Ch""k
"nd
R"p
ne Coolant
TROUBLESHOOTING
Problem
Possible cause
Remedy
Page
Adjust or
rePlace
belt
Clean radiator or condenser
Repair as necessary
Check
thermostat
Adjust timing
Replace
fluid
couPling
Replace
hose
I
ReOlace
water
PumP
I
Check radiator
I
n"pai, as necessary
I
cH-5
co-10
co-8
EM-23
co-6
co-6
co-10
Engine overheats
Fan
belt loose
or missing
Dirt, leaves
or insects
in radiator or
condenser
Hoses,
water
pump, thermostat
housing,
radiator, heater, core
Plugs
or
head
gasket leakage
Thermostat faultY
lnjection
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
HINT:
lf the engine tends to overheat, removal of
the thermostat
will
adversely effect cooling efficiency'
CHECK
AND
REPLACEMENT
OF
ENGINE COOLANT
1.
CHECK ENGINE COOLANT LEVEL AT RESERVE
TANK
The coolant level should be
between
the
"LOW"
and
"FULL" lines.
lf
low, check
for
leaks and add coolant up to
the
"FULL"
line.
2.
CHECK ENGINE COOLANT
OUALIW
Thereshouldnotbeanyexcessivedepositsofrustor
scalesaroundtheradiatorcap(wateroutletcap)orradiator
fillerhole(waterfillerhole},andthecoolantshouldbefree
from
oil.
lf excessively dirty, replace the coolant'