Chapter 6
PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
6-9
Cooling System
Changing Coolant
Remove the radiator cap only after the engine
cools to room temperature. Place a cloth over
the cap, and turn the cap about a half turn or
stand the lever to upright position to release
internal pressure. Opening the radiator cap
while the engine is hot causes steam and hot
coolant to blow out, resulting in skin burns.
Coolant (containing LLC) drained from an
engine is toxic, and must not be disposed of
into regular sewage. For disposal of used cool-
ant, consult a Mitsubishi dealer.
The service life of LLC is 2 years. Be sure to
change coolant at least once every 2 years.
Draining coolant
1 When draining coolant immediately after engine
operation, let the engine idle at low speed for 5
to 6 minutes and lower the coolant temperature
to 70 to 80
°
C [158 to 176
°
F].
2 Open the radiator cap.
3 Place coolant receiving cans under the drain
cocks on the engine and water pump, and open
the drain cocks to drain coolant.
Cleaning the cooling system
1 Close the drain cocks or plug.
2 Pour a cleaning solution (non-corrosive solution
to rubber and metals) in the cooling system, and
operate the engine at 800 to 900 min
-1
for about
15 minutes, then drain the cleaning solution.
3 Close the drain cocks or plugs.
4 Pour fresh water, and operate the engine at 800
to 900 min
-1
for about 10 minutes.
Continue flushing the cooling system in the
above manner until the draining water is clear.
fig.6-14 Radiator cap
fig.6-15 Draining coolant (Engine main parts)
fig.6-16 Draining coolant (Water pump)
Water drain
cock
