SERVICE AND MAINTENANCE
5-7
coolant. (Drainage may be speeded
by
removing the drain plugs in
the block.)
4. Close the drain valve (install block drain plugs, if removed). Add
water until the system
is
filled and run the engine until the upper
radiator hose
is
hot again.
5.
Repeat steps 3 and 4 several times
until
the drained liquid
is
nearly
colorless.
6.
Dra,in
the
system
and
then close the radiator drain valve tightly.
(Install block drain plugs, if removed.)
7. Disconnect all hoses from the coolant recovery tank. Remove, the
tank and pour out any fluid.
Scrub
and clean the inside
of
the' tank
with soap and water. Flush it well with clean water and drain.
Reinstall the tank and hose
s.
8.
Add enough ethylene glycol coolant (meeting
GM
Specification
l899
~
M)
and water to provide the required cooling, freezing, and
corrosion protection. Use
at
least a 50 percent solution, -34°F
(-37°C),
but
no more
than
a 70 percent solution. Fill the radiator to
the
base
of
the filler neck and fill the coolant recovery tank to
the
"Full"("Hot")
mark. Install recovery tank cap.
9. Run the engine, with the radiator
cap
removed, until the upper
radiator hose
is
hot.
I o. With the engine idling, add coolant' to the radiator until it reaches
the bottom
of
the filler neck. Install the radiator cap, making sure
that the arrowson
tbecap
line up with the overflow tube.
It
is
the owner's responsibility to:
• Maintain cooling system freeze protection
at
-34°F (-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
-34°F (·37°C).
NOTICE: Alcohol or methanol base coolants or plain water alone should
not be used
in
your
car
at
any time. They will boil
at
a lower point than
that
at
which the hot light indicator (or temperature gage) work
s,
and
they do not provide
proper
protection against corrosion.
THERMOSTAT
The engine coolant temperature
is
controlled by a thermostat.
It
stops
coolant
flow
through the radiator until a preset temperature
is
reached.
This thermostat
is
installed in the engine coolant outlet on the engine
block. The same thermostat
is
used
in
both winter and summer. When a
replacement
is
needed, Delco
parts
are recommended.
REAR AXLE--ST ANDARD
See Section A
of
the Maintenance Schedule folder to find out how often
the lubricant level should be checked.
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