Ford THUNDERBIRD 1960 - 4-1 Cooling System

COOLING SYSTEM
The cooling system consists of the
radiator
and radiator cap, water
TROUBLE DIAGNOSIS
Section
I
Trouble Diagnosis
2 General Maintenance
3 Radiator, Hoses, and
Thermostats
4 Fan and Belts
pump, thermostat, fan assembly,
and the fan drive belt.
Engine overheating and slow en
gine
warm-up are the two engine
troubles most commonly attributed
to the cooling system.
Loss of coolant and the accumu
lation of rust and scale in the system
are the main causes
of overheating.
Coolant loss can be caused by ex
ternal leakage at the radiator, radiator
supply tank, water pump, hose
con
nections, heater, and
core plugs.
Coolant loss can be caused also by
internal leakage due to a defective
cylinder
head gasket, improper tight
ening of the cylinder head bolts, or
warped cylinder head or cylinder
block gasket surface. Internal leakage
can be detected by operating the en
gine at fast idle and looking for the
formation of bubbles in the radiator.
Oil in the radiator may indicate leak
age in the engine block
or a
leak
in
the oil cooler for automatic transmis
sions. Also, water formation on the
oil level
dipstick could be an indica
tion of internal leakage.
Rust and scale that form in the
engine water passages are carried
into the small radiator passages by
the circulation of the coolant. This
clogs the radiator passages and
causes overheating.
If the coolant has
a rusty or muddy appearance, rust is
present.
A defective thermostat valve that
remains open will cause slow engine
warm-up.
TROUBLE DIAGNOSIS
ENGINE OVERHEATS
Insufficient coolant. Thermostat defective.
Loss of coolant. Cooling system passages blocked
Belt tension incorrect, by rust or scale.
Radiator fins obstructed. Water pump inoperative.
ENGINE FAILS
tO
REACH NORMAL
OPERATING TEMPERATURE
tive causing gauge
to indicate
low
Thermostat inoperative or incor
rect heat range.
engine temperature.
Temperature gauge defective not
Temperature sending unit defee-
indicating true engine temperature.
LOSS OF COOLANT
Leaking radiator.
Loose or damaged
hose connec- Cylinder block core plugs leaking.
lions. Cracked cylinder head or block,
Water pump leaking.
or warped cylinder head or block
Cylinder head gasket defective, gasket surface.
Improper tightening
of cylinder Radiator cap defective.
head bolts.
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