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76
FIAT· 850 PASSENGER CARS
COOLING
GENERAL
.
Checking Rate of
«
Paraflu 11)},
WATER PUMP
.
Removal and Installation
Disassembly and Assembly
Inspection and Repair
RADIATOR
.
Removal and Installation
Pressure Test
THERMOSTAT
THERMAL SWITCH.
Adjusting Generator and Water Pump Drive Belts Tension.
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GENERAL
The coolant in the cooling system is of the per-
rna"nent type, its replacement being envisaged to
be made only every other year or 36,000 miles
(60,000 km) of running.
The coolant consists of a 50-50 mixture of mag-
nesium free water and FIAT Paraflu 11 fluid with
.18
02
(5
grams) of
Arexons sealing powder, hav-
ing a freezing point of about -30
0
F (-36
0
C).
The radiator is connected. through a pipe on its
filler neck, to a tank (4,
fig.
130), which compensates
the volume and pressure variations in coolant due
to engine thermal cycling.
The FIAT Paraflu 11 fluid is colored to facilitate
visual level checks in tank, which is translucent.
Fluid features anti-oxide, anti-corrosion, anti-foam
and anti-scale properties.
During engine operation coolant level is apt to
rise due to expansion and to the formation of vapor
bubbles.
The level should then be checked only with
engine stopped and cold.
Under these conditions the coolant level
in
tank
should have a head of about 2
3/~"
(7 cm) above
the
min
mark.
The remaining upper free space
allows not only the expansion of coolant but acts
also as a constrainer for the liquid that would other-
wise spill away during the short periods in which,
under particular conditions (sudden stops on gra-
dients, slow column traffic, etc.), the system boils.
The liquid level in tank (4), must not show var-
iations when checked with a cold engine.
Directions for Use.
Check periodically coolant level in expansion
tank, with a cold engine: it must always be above
the min mark.
With very hot engine the level
will rise remarkably, and this may also occur im-
mediately after stopping the engine.
Should
it
be found that the level has dropped
below the min mark on tank wall, the system shall
be closely inspected, as outlined further on, and
topped up.
Only in emergency (severe and sudden coolant
losses) refill can be made with tap water as follows:
allow the engine to cool down;
- remove radiator and expansion tank caps;
- pour water into expansion tank until overflow
is noted from radiator filler neck.
As soon as possible fix the fault and refill with
coolant as directed hereafter.
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