Volvo VNL Operator's Manual page 80

Instruments and Controls 75
B — Engine Coolant Temperature
The gauge indicates engine coolant temper-
ature. Normal operating temperature
reading is 165 to 205 F (75 to 95 C) for
the VOLVO engine. The temperature, under
normal driving conditions, must be below
the red sector. The temperature range for
the coolant will vary depending on the type
of engine, load, grade, ambient air tempera-
ture and operating conditions. If the
temperature remains below or exceeds the
normal temperature range, the cooling sys-
tem should be checked for problems by
W3003769
your Volvo Truck dealer.
The LED light in the lower right corner of
the gauge lights up solid when coolant tem-
perature is excessive. The temperature limit
is dependent on the engine manufacturer
electronic program. Together with the
W3003614
gauge light, the red STOP telltale will
come on and the buzzer will also sound.
The engine is at risk and the engine con-
troller may react by derating the engine
power. Stop at the first safe place where the
problem can be checked.
T3008861
NOTE! If the coolant temperature returns
to normal shortly after exceeding the limit
and no repair has been made, the warning
messages go out but there will be a fault
message logged.