Overcooling - Isuzu AU-4LE1T Maintenance Manual

If the engine coolant level in the reserve tank is at the correct level but
there is still an indication on the instrument panel of an overheat
condition:
•
YOU MUST LET ENGINE COOL FIRST.
engine coolant directly to the radiator.
Once the Engine Coolant Temperature Gage no longer signals an
overheat condition, you can resume operating at a reduced speed.
Return to normal operating after about ten minutes if the gage pointer
does not again show an overheat condition.
If no cause for the overheat condition was found, see a qualified
service technician.

Overcooling

The engine operation at low coolant temperature will not only increase
the oil and fuel consumption but also will lead to premature parts wear
which may result in engine failure.
You may then add
49