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CAUTION: Extreme care must be taken when removing radiator pressnre
cap while engine Is hot because
relievln~
the pressure will cause the cool-
ing system to boll, if alcohol is used for anti-freeze, with resultant loss of
water or anti-freeze solution. When removing filler cap,
rotate.
cap toward
left very slowly; if hissing of vapor is encountered, tighten
cap'
immediately
and wait for system to cool sufficiently to allow removal of cap. After pres-
sure in the system has been relieved, turn cap more forcibly to left and
remove
.
Turn cap all the way to the right when installing. This caution
should not be taken lightly since severe injury and fire (if alcohol and other
inflammable vapors are present) are possible If the radiator cap is removed
while there is pressure in the cooling system.
.
NOTE:
If
through some oversight the water in the radiator should get
extremely low and the engine very hot, let it cool 011 for ten or fifteen
minutes before adding water, then add it slowly, with the engine running.
Cold water on hot surfaces might crack the cylinder head or block.
USING RUST PREVENTIVE-Nearly all the anti-freezes on the
market today contain chemicals to inhibit rust formation in the
cooling system. When the anti-freeze is removed this protection may
be continued by adding a can of GM Radiator Rust Preventive or a
suitable substitute to your cooling system solution.
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 above
and also
on
the amount of "scale" the water
in your community deposits in the cooling
system.
If you want to make
sure your cooling system is always in the best shape, however, 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 26.) Both
.valves and radiator filler must be open to drain the engine completely.
After the liquid has 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
.
.:t-
In cases where the accumiilation 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
operati~n,
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.
[25
J
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