Isuzu AU-4LE1T, Maintenance Manual

Page: 52 / 126

47
If the Engine Coolant Temperature gage shows an overheat condition,
or you have reason to suspect the engine may be overheating, take the
following step:
•
If your air conditioner (if equipped) is on, turn it off. And turn on
the heater.
•
Don’t turn off your engine.
•
With the transmission in Neutral, increase the engine speed to
about one-half full operating speed or 1200 RPM, maximum.
Bring the idle speed back to normal after two or three minutes.
If the engine coolant temperature does not start to drop within a minute
or two:
•
Let the engine run at normal idle speed for two or three minutes.
If the engine coolant temperature does not start to drop, turn off the
engine and get out of the machine or equipment then proceed as
follows:
WARNING:
To help avoid being burned-
•
Do not open the engine access cover if you see or hear
steam or engine coolant escaping from the engine
compartment. Wait until no steam or engine coolant can
be seen or heard before opening the engine cover.
•
Do not remove the radiator cap or engine coolant reserve
tank cap if the engine coolant in the tank is boiling. Also
do not remove the radiator cap while the engine and
radiator are still hot. Scalding fluid and steam can be
blown out under pressure if either cap is taken off too soon.