Mitsubishi Carisma Owner's Manual page 244

MAINTENANCE
Anti–freeze
The engine coolant contains an ethylene
glycol anti–corrosion agent. The cylinder
head and water pump housing are cast alu-
minium alloy, and periodic changing of the
engine coolant is necessary to prevent cor-
rosion of these parts.
Use High–quality Ethylene–glycol includes
coolant.
It has excellent protection against corrosion
and rust formation of all metals including alu-
minium and can avoid clogs in the radiator,
heater, cylinder head, engine block, etc.
Because of the necessity of this anti–cor-
rosion agent, the coolant must not be re-
placed with plain water even in summer. The
required concentration of anti–freeze differs
depending on the expected ambient tem-
perature.
9–6
CAUTION
(1) Do not use alcohol or methanol
anti–freeze or any engine cool-
ants mixed with alcohol or meth-
anol anti–freeze. The use of an
improper anti–freeze can cause
the corrosion of the aluminium
components.
(2) For effective anti–corrosion and
anti–freeze performance, keep
the anti–freeze concentration
within the range of 45 to 60%.
Concentrations exceeding 60%
will result in a reduction of both
the anti–freeze and cooling per-
formance thus adversely affec-
ting the engine.
(3) Do not top off with water only.
Water by itself reduces the rust–
protective and anti–freeze qua-
lities of the coolant and has a
lower boiling point. It can also
cause damage to the cooling sys-
tem if it should freeze. Do not use
tapwater, or it could cause cor-
rosion and rust formation.
During cold weather
If the temperatures in your area drop below
freezing, there is the danger that the coolant
in the engine or radiator could freeze and
cause severe damage to the engine and/or
radiator. Add a sufficient amount of anti–
freeze to the coolant to prevent it from freez-
ing.
The engine coolant mixture used at the fac-
tory provides protection against freezing for
temperatures as low as approximately
–30°C. The concentration should
checked before the start of cold weather and
anti–freeze added to the system if necess-
ary.
be