Chevrolet 1973 Monte Carlo Owner's Manual page 61

3.
If
radiator is not equipped
with a drain valve start to
drain system as follows:
a. With engine stopped, insert
one end of a 5-foot length
of % inch tubing into the
filler neck until it touches
the bottom of the radiator.
b. Insert any type of large
syringe into the open end
of the tubing and initiate
the siphoning process by
squeezing and releasing the
ball.
c. Completely drain radiator
coolant through the siphon
tube. (To speed this oper-
ation, the drain plugs in
block can also be removed.)
d. Remove tubing (install
block drain plugs, if re-
moved) and add sufficient
water to fill system.
4. Close drain valve (install
block drain plugs, if removed)
if so equipped and add suffi-
cient water to fill system.
5. Run engine, drain and refill
the system, as described in
steps 1, 2, 3, and 4, a suffi-
cient number of times until
the drained liquid is nearly
colorless.
6. Allow system to drain com-
pletely and then close radia-
tor drain valve tightly if so
equipped (Install block drain
plugs, if removed.)
7. Remove recovery cap leaving
hoses in place. Remove cool-
ant recovery tank and empty
of fluid. Plush tank with clean
water, drain and reinstall.
8. Add sufficient ethylene glycol
coolant, meeting GM specifi-
cation 1899-M, to provide the
required freezing and corro-
59
sion protection-at least a 44
percent solution (_20
0
P). Pill
radiator to the base of the
radiator filler neck and add
sufficient coolant to the re-
covery tank to raise level to
the "PULL HOT" mark. Re-
install recovery tank cap.
9. Run engine, with radiator cap
removed, until normal operat-
ing temperature is reached.
(Radiator upper hose becomes
hot.)
10. With engine idling, add cool-
ant until level reaches bottom
of filler neck and install radi-
ator cap making certain ar-
rows line up with overflow
tube.
It is the owner's responsibility
to keep the freeze protection at a
level commensurate with the tem-
peratures which may occur in the
area of vehicle operation.