Hudson 1948 - 1952, Service Manual

Page: 129 / 333

2. Install radiator cap and attach long hoses to radiator
connections as shown in Figure 1. Insert the flushing gun
as shown.
3. Connect water hose of gun to a pressure water source and
air hose of gun to a pressure air source. Turn on the
water, and when the radiator is full, turn on the air in
short blasts. Allow the radiator to fill between the blasts
of air. Continue this procedure until water from the
lead-away hose runs clear.
USE OF INHIBITOR
The regular use of a cleaning and inhibiting fluid in the
cooling system and periodic reverse flushing will greatly
reduce the formation of rust, scale, and corrosion. The
logical time for flushing and introduction of inhibitor is
when the anti-freeze is Installed in the fall and when it is
removed in the spring.
A good combination inhibitor and cleaning solution
should be kept in the cooling system at all times.
CAUTION: Care must be used in the selection of an
inhibitor and cleaner as some of them contain strong acids
or caustics that will react with the metal of the radiator
core, eating holes through the metal and causing the
radiator to leak.
The effectiveness of any inhibitor is limited to about six
months after which the cooling system should be flushed,
refilled, and new inhibitor added.
Hot water heaters should be flushed separately.
Rust deposits build up in the heater core just the same as
they do in the radiator core and will decrease the efficiency
of the heater.
ANTI-FREEZE SOLUTION
There are several anti-freeze solutions available that are
satisfactory for automobile cooling systems. Among these
are denatured alcohol, methanol (synthetic wood alcohol)
and ethylene glycol. It is recommended that the cooling
system
system be cool before adding an antifreeze solution. To
facilitate accurate testing of freezing points, it is advisable
not to mix different basic types of anti-freeze.
The alcohol anti-freeze solutions are subject to evapora-
tion, especially on heavy runs, and should be tested at least
once a week, and the necessary quantity of anti-freeze added
to protect the cooling system for the lowest anticipated
temperature.
CAUTION: These Liquids, if spilled on the vehicle,
should be washed off immediately with a generous quan-
tity of water to prevent damage to lacquer or enamel.
When using ethylene glycol, it is necessary to clean the
entire cooling system before putting in the anti-freeze solu-
tion.
It is also advisable to tighten or replace all hose
connections. It is important that the cylinder head gas-
ket be kept tight to prevent leakage.
If there are leaks in the system, they should be located
and stopped. If evaporation occurs with the use of
ethylene glycol, it is only necessary to add water to the
solution; however, the cooling system should be
watched closely for leaks, and should be tested when
additional water is required.
CAUTION: Solutions containing salt, calcium chloride,
soda, sugar, or mineral oils such as kerosene or engine oil
should NEVER be used in the cooling system as they either
clog the water passages or damage the hose connection
and-other parts.
TESTING ANTI-FREEZE SOLUTION
The freezing pointof an anti-freeze solution maybe deter-
mined by using a hydrometer. When testing the solution, it
should be tested at the temperature for which the hydrome-
ter is calibrated, and the correct hydrometer for the solution
should be employed in testing.
COOLING SYSTEM 5 - 3