5-35
NOTICE: Do not use methanol-base antifreeze, alcohol or plain
water alone in your vehicle at any time. They will boil at a lower
point than that at which the engine coolant temperature gauge will
warn of overheating, and they do not provide proper protection
against corrosion.
12.After confirming that the engine coolant has sufficiently cooled
down, remove the radiator cap. Be sure to top up the engine
coolant if the level has gone down. If the level of engine coolant is
dramatically reduced, check the coolant channel and reserve tank
hose for leaks.
THERMOSTAT
The engine coolant temperature is controlled by thermostat(s). The
thermostats stop engine coolant flow through the radiator until a preset
temperature is reached. The thermostats are installed in the engine
coolant outlet on the engine block. The same thermostats are used in
both winter and summer. When a replacement is needed, genuine
Isuzu parts are recommended.
RADIATOR PRESSURE CAP
The radiator cap, a 108 kPa (16 psi) pressure type, must be installed
tightly, otherwise engine coolant may be lost and damage to the
engine may result from overheating. Radiator pressure cap should be
checked periodically for proper operation. If a replacement is required,
an Isuzu genuine cap is recommended.
CAUTION: If the above step is omitted, the engine alarm and
automatic shutdown system may be unexpectedly activated. Make
sure to perform this step.
13.Securely fit the radiator cap.
14.Open the reserve tank cap, and fill to the "MAX" mark with engine
coolant, before closing.
It is the owner’s responsibility to:
• Maintain the engine cooling system freeze protection at –20°F
(–29°C) or in Canada at –40°F (–40°C) to ensure protection against
corrosion and loss of engine coolant from boiling. A 50/50 (48/52
for Canada) mixture of Isuzu Long Life Coolant antifreeze and
water will provide freeze protection to –33°F/–36°C (in Canada
–40°F/–40°C) and boil protection to 262°F (128°C). Periodic
replacement of engine coolant is needed to replenish the
anticorrosion additives that wear out with use.
Engine coolant that has become dark in color shows that it needs to
be changed.
• Use only Isuzu Long Life Coolant antifreeze.
55702_Sec05-2_'08 08.2.12 9:51 AM Page 35
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