Mitsubishi MOTORS Colt 2007 Owner's Manual page 355

Diesel- powered vehicles
If the level drops below the "LOW" level on the reserve tank,
open the lid and add coolant to the "FULL" level.
WARNING
!
● Do not open the reserve tank while the engine is hot.
The coolant system is under pressure and any hot
coolant escaping could cause severe burns.
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 corrosion of these parts.
Use a High-quality ethylene glycol based coolant. This has
excellent protection against corrosion and rust formation of all
metals including aluminium and can avoid blockages in the
radiator, heater, cylinder head, engine block, etc.
Because of the necessity of this anti-corrosion agent, the cool-
ant must not be replaced with plain water even in summer. The
required concentration of anti-freeze differs depending on the
expected ambient temperature.
Ambient temperature
-30
(minimum) °C
Anti-freeze
45
concentration %
During cold weather
If the temperatures in your area drop below freezing, there is a
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 freezing.
-35 -50
The engine coolant mixture used at the factory provides protec-
tion against freezing for temperatures as low as approximately
-30 °C. The concentration should be checked before the start of
50 60
cold weather and anti-freeze added to the system if necessary.
CAUTION
!
● Do not use alcohol or methanol anti-freeze or any
engine coolants mixed with alcohol or methanol
anti-freeze. The use of an improper anti-freeze can
cause corrosion of the aluminium components.
● For effective anti-corrosion and anti-freeze per-
formance, keep the anti-freeze concentration within
a range of 45 to 60 %.
Concentrations exceeding 60 % will result in a
reduction of both the anti-freeze and cooling per-
formance, thus adversely affecting the engine.
● Do not top up with water only.
Water by itself reduces the rust-protective and anti-
freeze qualities of the coolant and has a lower boil-
ing point. It can also cause damage to the cooling
system if it should freeze. Do not use tap water, as it
can cause corrosion and rust formation.
Maintenance
8
8-13