concentration. The precharge (larger) coolant filter should
only be used to precharge the cooling system on a new engine
or when the coolant is replaced. The continued use of the
precharge element could result in plugging and overheating
The normal service element is used to replace the precharge
element after the first 19 000 km or 12, 000 miles.
Subsequent replacements of the normal service element after
16 000-19 000 km or 10, 000-12, 000 mile intervals will
maintain the required concentration. Servicing too often may
result in the formation of a white deposit in the system.
Unlike the old borate and chromate water filters, the new water
filters must be used only after the cooling system has, been
thoroughly drained and chemically flushed with inhibited
hydrochloric acid or inhibited oxalic acid. Failure to chemically
flush, prior to using the new water filters, may result in plugged
radiator and heater cores or even solder deterioration. The
chemical in the new water filters will loosen any cooling
Systems Without Coolant Filters
Vehicles without a coolant filter must have the coolant
inhibitors replenished by adding IH cooling conditioner. The
conditioner should be added as recommended in the
respective Operators Manuals.
NOTE-- A complete drain, flush and refill with water and
conditioner, or IH anti-freeze and coolant is recommended
once a year. This Includes all vehicles regardless of
If the cooling system has been permitted to become rusty or
dirty, use IH cooling system cleaner and neutralizer carefully,
following cleaning recommendations on the container.
Coolant Testing for Inhibitor Strength
Coolant should be checked for reserve alkalinity, using test
strips available from various sources, at each oil change.
Indication of a low alkalinity condition requires adding IH
cooling conditioner, changing cooling filter or changing
DRAINING THE COOLING SYSTEM
When the cooling system of a vehicle is drained, some coolant
is likely to be retained in the pockets of the cooling system.
This is especially true in engines equipped with oil coolers or
heat exchangers having a tube bundle. If only water with
cooling conditioner is used and these engines are drained and
then exposed to freezing temperatures, the water conditioner
will freeze and possibly rupture one or more of the tubes. The
resulting leak will be difficult to locate and could eventually
damage the engine by mixing the coolant with the engine oil.
To avoid damage, take one of the following precautions when
draining for shipment or storage in freezing temperature:
Fill the cooling system with anti-freeze solution,
operate engine until the thermostat opens or until circulation is
observed in the radiator circuit, then drain.
If conditioned water is used, drain the engine. Then
blow out the residual solution in the cooler tubes with
compressed air through one of the drain cocks or plugs on the
CLEANING THE COOLING SYSTEM
Once a year the cooling system should be drained and
Unless the cooling system is treated with a corrosion
preventative, rust and scale will eventually clog up passages in
the radiator and water jackets. This condition is aggravated in
some localities by formation of insoluble salts from the water
IH cleaning solutions are available, which have proven very
successful in removing accumulation of rust, scale, sludge
and grease. This solution should be used according to the
recommendation on the container.
CAUTION - DO NOT USE CHEMICAL MIXTURES TO STOP
RADIATOR LEAKS EXCEPT IN ANY EMERGENCY. NEVER
USE SUCH SOLUTIONS INSTEAD OF NEEDED RADIATOR
When draining the cooling solution, disconnect the radiator
outlet hose, as large particles of sediment will not pass
through the drain.
WARNING - USE ONLY THE FOLLOWING PROCEDURE TO
RADIATOR. ALWAYS ALLOW THE ENGINE TO COOL
FIRST. WRAP A THICK, HEAVY CLOTH AROUND THE
CAP. PUSH DOWN, LOOSEN CAP SLOWLY TO ITS FIRST
NOTCH POSITION; THEN PAUSE A MOMENT. THIS WILL
AVOID POSSIBLE SCALDING BY HOT WATER OR STEAM.
CONTINUE TO TURN CAP TO THE LEFT AND REMOVE.
CAUTION - IF THE COOLANT SHOULD GET EXTREMELY
LOW AND THE ENGINE VERY HOT, LET THE ENGINE
COOL FOR APPROXIMATELY 15 MINUTES BEFORE
ADDING COOLANT. THEN, WITH THE ENGINE RUNNING,
ADD COOLANT SLOWLY. ADDING COLD WATER TO A
HOT ENGINE MAY CRACK THE CYLINDER HEAD OR
accessories should be open to allow complete circulation
during cleaning, flushing and draining. Run the engine with
the radiator covered if necessary, until temperature is up to
operating range of 72-84°C