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USING RUST PREVENTIVE-Nearly
all the anti-freezes on the
market today contain chemicals to inhibit rust formation in the
cooling system. Since rust forms more rapidly in the higher tem-
peratures common in summer
driving,
you may want to continue
this protection after draining anti-freeze in the spring.
This
may be done
by
adding a can of GM Radiator Rust
Preventive
or a suitable substitute
to
your cooling system solution at the time
you have anti-freeze removed. (Avoid the use of any rust preventive
which might include petroleum oils, because of pcssible harmful
effects on radiator and heater hose.)
FLUSHING- When you will actually need this service depends to
a
great extent on
whether you keep a
rust preventive
in the cooling
system
as described abeve and Olso on the amount of
"scale"
the
water
in
your community depcsits in the cooling system. If you
want
to make
sure your
cooling system
is always in the best
shape,
how-
ever,
it's
a
good
idea to have it flushed
every
fall
before
you install
anti-freeze.
Radiator flushing is performed by disconnecting the
hose
between
the radiator and
engine
block and
"pressure
flushing"
the radiator unit to remove all rust, rubber particles and
other
foreign matter.
If reverse
flow
flushing
facilities for
cleaning your cooling
system
are not
convenient,
you might run the
engine
until it is warm; then,
stop the
engine, back off or remove radiator filler
cap,
and
open
the
two drain valves for the
cooling
system. (See Storing Car, Page
51.)
Both valves and radiator filler must be open to drain the
engine
completely
.
After the liquid
ha
s
drained off, refill the cooling
system
with
hot water,
run
the engine
for
a few minutes and again drain
the
system.
Repeat this
operation
until the water is clean
when
it
is
drained.
In
cases
where the accumulation
of
rust and
scale
is so great that
this method does not clean the system adequately, the system can be
flushed
out
using GM Cooling System
Cleaner,
or other suitable
cleaner-
follow the directions on the
cleaner
container. After this
operation, the
system
must again be thoroughly flushed to remove
all traces of the
cleaning solution.
Do not allow any of the solution
to reach the
car
finish.
.
50
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