GMC 2003 Sierra 1500 Pickup Owner's Manual page 415

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The coolant level should
If there seems to be no leak, start the engine again.
be at or above the FULL
The engine cooling fan speed should increase when idle
COLD mark. If it isn't,
speed is doubled by pushing the accelerator pedal
you may have a leak at the
down. If it doesn't, your vehicle needs service. Turn off
pressure cap or in the
radiator hoses, heater
hoses, radiator, water
pump or somewhere else
in the cooling system.
Heater and radiatc
loses, and o t l ~
- - E
er-,.ne
parts, can be very hot. Don't touch them. If you
do, you can be burned.
Don't run the engine if there is a leak. If you
run the engine,
it
could lose all coolant. That
could cause an engine fire, and you could be
burned. Get any leak fixed before you drive the
vehicle.
the engine.
Notice: Engine damage from running your engine
without coolant isn't covered by your warranty.
See "Overheated Engine Protection Operating
Mode" in the Index for information on driving to a
safe place in an emergency.
Notice: When adding coolant, it is important that
you use only DEX-COOL@ (silicate-free) coolant.
If coolant other than DEX-COOL@ is added to
the system, premature engine, heater core or
radiator corrosion may result. In addition, the engine
coolant will require change sooner
-
at 30,000 miles
(50 000 km) or 24 months, whichever occurs first.
Damage caused by the use of coolant other
than DEX-COOL@ is not covered by your new vehicle
warranty.
5-40

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