Regional Haul Model Operator's Manual - Peterbilt Motors Company

STANDARD GAUGES
water temperature gauge should register between 165°
and 205°F (74° and 90°C). Under certain conditions,
somewhat higher temperatures may be acceptable. But
the maximum allowable temperature is 210°F (99°C) with
the cooling system pressurized, except for certain special
engines. Check your engine manual to be sure.
Engine Overheating
WARNING! Stop the vehicle in a safe location
if the engine temperature gauge indicates an
overheating situation. Failure to park the vehicle
in a safe location may result in death, personal
injury or property damage.
Wait until the coolant temperature is below 122° F (50°C).
Protect your face, hands, and arms by covering the cap
with a large, thick rag to protect you against escaping fluid
and steam. Before you completely remove the cap, carefully
and slowly turn the cap part way to allow excess
pressure to escape. Then push down and turn for final
removal.
The cooling system may overheat if the coolant level is
below normal or if there is a sudden loss of coolant (such
as a worn hose splitting). It may also temporarily overheat
CONTROLS AND DISPLAY
during severe operating conditions such as climbing a
long hill on a hot day or stopping after high-speed driving.
WARNING! Do not remove the radiator fill cap
while the engine is hot. Scalding steam and
fluid under pressure may escape and cause
death or serious personal injuries. You could
be badly burned.
• Wait until the coolant temperature is below
122°F (50°C).
• Protect face, hands, and arms by covering
the cap with a large, thick rag to protect
against escaping fluid and steam.
• Carefully and slowly turn the cap one-quarter
of a turn or until it reaches the first stop—
allowing excess pressure to escape—push
down and turn for final removal.
If the “Engine Coolant Temperature” warning light comes
on, or you have any other reason to suspect the engine
may be overheating:
• Stop the vehicle, but DO NOT TURN OFF THE
ENGINE unless a low water warning device indicates
a loss of coolant.
– 40 – Y53-6033 Regional Haul (R05/10)