radiator cap while the engine and
radiator are still hot. Scalding fluid and
steam can be blown out under pressure
if
the
cap
is
taken off too soon.
2. Run the engine, with radiator
cap
removed, until upper radiator hose is
hot. This
shows
that the thermostat is
open.
3.
Stop engine and open radiator drain
valve
to drain coolant. Drainage may
be speeded by removing drain
plugs
in
the block
(if
so
equipped).
4.
Close
valve
(install block drain plugs,
if
removed). Add water until the system
is
filled.
5. Repeat steps 1, 2, 3 and 4
several
times until the drained liquid
is
nearly
colorless.
6. Drain system then
close
radiator drain
valve
tightly. (Install block drain plugs,
if
removed.)
7. Remove recovery tank cap,
leaving
hoses in place. Remove coolant
recovery tank and empty fluid.
Scrub
and clean bottom and sides of tank
with soap and water. Plush
well
with
clean water and drain. Reinstall tank.
8. Add enough ethylene glycol coolant,
meeting
GM
Specification 1899-M, to
provide the required cooling function
as
well as freezing and corrosion
protection.
Use
a 50 percent solution,
_35°
P (.37° C),
butno
more than a
65
percent solution. Pill radiator to the
base
of
the radiator filler neck and
raise
level
of coolant in the recovery
tank to the
"PULL HOT" mark.
Reinstall recovery tank cap.
9.
Run the engine, with the radiator
cap
removed, until the radiator upper hose
becomes hot.
10.
With
engine idling, add coolant
to
radiator until
level
reaches bottom
of
filler neck. Install cap, making sure
arrows line up with overflow tube.
It
is
the owner's responsibility to:
•
Maintain
cooling
system freeze
protection at
_35°p
(-37°C) to ensure
protection against corrosion and loss of
coolant from boiling. This should be
done
even
if
freeZing
temperatures are
not expected.
• Add ethylene glycol base coolant that
meets
GM
Specification 1899·M when
coolant has to
be
added because of
coolant loss
or
to
provide added
protection
against
freezing
at
temperatures lower than
_35°p
(-37°C).
NOTICE: Alcohol or methanol base coolants
or plain water alone should not be
used
in
your
CiIr
at
any time.
RADIATOR
PRESSURE
CAP
The radiator
cap
is
a
15
to
18
psi
(105
to
120
kPa)
pressure type.
It
must be installed
tightly, or coolant may be lost and
damage
to engine could result from overheating.
The
cap
should be checked now and then
to be
sure
it works properly.
THERMOSTAT
The
engine
coolant temperature
is
controlled
by
a thermostat.
It
prevents
circulation of coolant through the radiator
until
a preset temperature
is
reached. This
thermostat
is
installed
in
the engine
coolant outlet. The
same
thermostat is
used
in both winter and summer.
When
a
replacement
is
needed,
Delco
parts are
recommended.
65
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