dueers'
Association, to avoid corrosion,
is
satisfactory for
use
in
the
cooling system.
Servicing
the
Cooling System. Before installing anti·freezing
solution,
the
cooling
system
should
be inspected
and
serviced
for
winter
operation.
The
system
should
be
thoroughly
cleaned
and
all loose scale
and
iron
rust
removed.
Cylinder
head
bolts
should
be tightened
to
avoid
the
pas·
sibility of anti·freezing solutions l
eaking
into
the
engine
or
exhaust
gas blowing into
the
cooling system. Anti·freeze,
or
water,
mixed
with
engine oil
may
form
sludge, which will
interfere
with
lubrication and,
in
some cases,
may
fonn
var--
nish,·like deposits which
will
cause
gumming
and
sticking
of
the
moving parts.
NOTE:
Tichtenia&:
c:ylmdel' b
e.d
bolts
may
deaease
valve
de...-
IUlce.
Cbeck
and
.djust
nlves
If
nec:e55U')'
(See
Valve
AdJwt-
ment).
It
may
be advisable to install
new
radiator
and
heater
hose,
especially when
ethylene
glycol
or
glycerine anti-free:r.ing
solu.
tions
are
used.
Ethylene
glycol
and
glycerine
have
a
tendency
to
shrink
rubber
that
previ
ous
ly
has
been
swollen
by
the
absorption
of
water,
and
l
eaks
may
develop.
The
water
pump
seal
must
be
leak
tight,
not
only
to
avoid
loss of liquid,
but
to
prevent
air
from
being
drawn
into
the
cooling system. Aeration of
the
cooling liquid causes foaming
and
promotes oxidation which
may
result
in
ser
i
ous
corrosion.
After
the
anti-free~
solution
has
been
installed,
the
entire
system, including
the
hose
connections,cylinder
h
ead
gasket
and
pump,
should be inspected.
regularly
to
insure
that
no
leaks
have
aeveloped.
'!be
use
of
additional
rust
preventives,
or
inhibitors, is
not
recommended w
ith
"GM
Anti-Freeze,"
"GM
Ethylene
Glycol,"
or
with
other
anti-freeze
preparations
that
have
been
chem-
ically
treated
or
compounded. for use
in
automotive cooling
sy
stems.
Lo55
of Anti-Freezing Solutions. Anti-freeze,
or
water,
or
both
may
be
lost from
th
e cooling
system
through
leaks,
evapora
-
tion, boiling, foaming,
or
expansion. Loss
through
excessive
evaporation
or
boiling
may
be
caused
by
impaired circulation
or
through
the
use of a high
temperature
thermostat.
Lo
ss
by
expansion is a
re
s
ult
of overfilling.
In
the
average
•
39
·
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