GMC 2003 Sierra - Manual (Page 415)

The cooianl le/eJ should
be a1 or above the FULL
COLD mark. If It IsnT,
you may have a leak al The
pressure tap or in Ihe
radiator ho^s, heater
hoses, radiator, water
pump or somewhera else
in the cooling system.
Healer and radiator ho^es^ and other engine
parts, car> be very hot. Donl touch them. It you
do. can be burned.
Don't run the engine it thera is a leak. If you
run the engine, it could lose all coolant. That
could cause an engine Nre^ and you could be
burned- Get any leak fixed before you drive the
vehicle.
If Ihe re sQBms tq be no leak, start the engine again.
The engine cooling fan speed should increase when idle
speed is doubled by pushing ihe accelerator pedal
down. 1f if doesn'L your vehide needs service. Turn oH
the angine.
Notic&i Engine damage from running your engine
without coolant isn't covered by your warranty.
See '‘Overheated Engine Protection Operating
Mods'' in the Index for informallon on driving to a
sate place in an emergency.
Notice: №hen adding cooianl. it Is important thaï
you use only DEX-COOL*isilicate'freBj cootanl.
If coolant other then DEX-COOL^ Is added lo
the system, premature engine^ heater core or
radiator corrosion may result. In addition, the engine
coolant will require change sooner — at 30,000 mlraa
{50 ÛÛQ km) or months, whichever occurs first.
Damage caused by the use of coolant other
than D EX-COOL® is not covered by your new vehicle
warranty.
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