Cooling System Sealing Additives
and Soluble Oils
1. Do not use soluble oils or sealing
additives.
CAUTION
The use of sealing additives or soluble
oils in the cooling system can cause
damage to the engine. These additives
can plug various areas of the radiator,
EGR system and oil cooler. The plug-
ging of the cooling system can hamper
heat transfer, causing internal engine
damage. DO NOT use sealing addi-
tives or soluble oils in the cooling sys-
tem. The use of sealing additives can:
• Build up in coolant low-flow
areas
• Plug the radiator and oil cooler
• Damage the water pump seal
• Damage heat transfer surfaces
• Damage seals and hoses
• Corrode brass and copper
Failure to comply may result in equip-
ment or property damage.
Coolant Level
Replacement or top up coolant should
have the same antifreeze concentration
and corrosion inhibitor content as the
original coolant in the cooling system. If
operating in sub-freezing conditions, a
60/40 mix of antifreeze and distilled water
may be substituted.
Always dilute antifreeze to the correct
concentration based on freeze protection
before adding it to the cooling system.
Adding or using 100% antifreeze in a
cooling system may result in cooling
system plugging and overheating
problems.
This procedure should be followed as part
of daily and refueling maintenance checks.
Perform the following steps to check the
coolant level:
1. Check that vehicle is a on a level
surface.
2. Ensure engine has not been run for
several hours.
CAUTION
Due to thermal expansion the coolant
level CANNOT be checked if the cool-
ant is above ambient temperature or
the engine has not completely cooled.
The coolant level indicated on a
warmed system will be inaccurate and
can lead to low coolant conditions dur-
ing cold-starts.
3. Check coolant level. It should be
visible through the clear plastic
surge tank.
4. Add coolant as necessary until
proper level is reached; see special
fill instruction if filling from empty.
NOTE
The pressure cap (on the rear-top of
the surge tank) should NEVER be re-
moved. The fill cap (on the ergonomic
fill neck, not on the the surge tank) is
the correct fill point.
MAINTENANCE - Cooling System Maintenance
Y53-6076-1D1 (09/20) 227
5
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