Chevrolet Low Cab Forward 6.7L 2022 Owner's Manual page 207

206 Vehicle Care
If the engine coolant temperature gauge
shows an overheat condition, or you have
reason to suspect the engine may be
overheating, take the following steps:
1. Operate the hazard warning flasher and
pull the vehicle immediately over to a
safe place that does not impede traffic
and park it.
2. Idle the engine and wait until the engine
coolant temperature drops to safety
zone. If your air conditioner is on, turn it
off. And turn on the heater to help the
engine expel heat.
3. When the needle of the engine coolant
temperature gauge returns to the middle
of the safety zone, stop the engine.
If the needle of engine coolant
temperature gauge does not drop inside
into the safety zone, turn the engine off
and have your vehicle serviced at the
nearest dealer.
When the cooling fan for the radiator is
not turning, turn off the engine
immediately.
Warning
Even when the engine has been stopped,
the engine coolant in the radiator
remains under pressure. Immediately
removing the radiator cap could cause
steam or hot water to blow out, and you
could be scalded as a result. The engine
coolant in the reserve tank may also be
hot. Immediately removing the cap could
cause hot water to blow out, and
possibly scald you. Perform inspection,
refilling, and replacement of coolant only
when its temperature has cooled.
When removing the radiator cap and
reserve tank cap, use a thick cloth to
cover the cap and turn it little by little.
You and others could be seriously injured.
4. If no steam or engine coolant can be
seen or heard from the engine
compartment:
Tilt the cab.
If the engine coolant is boiling,
wait until it stops before
proceeding.
Look at the see-through reserve
tank. The engine coolant level
should be between the "MAX"
and "MIN" lines on the
reserve tank.
If necessary, pour engine coolant
(See Engine Coolant 0 201 for the
proper coolant and water
mixture) into the reserve tank