Chevrolet 2007 Express 2007 Express Owner's Manual page 314

When the engine is cold, the coolant level should
be at or above the COLD FILL mark. If it is not,
you may have a leak at the pressure cap or in the
radiator hoses, heater hoses, radiator, water pump,
or somewhere else in the cooling system.
CAUTION:
{
Heater, fuel operated heater (FOH),
radiator hoses, and other engine parts,
can be very hot. Do not touch them.
If you do, you can be burned.
Do not 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.
If there seems to be no leak, start the engine
again. See if the engine cooling fan speed
increases when idle speed is doubled by pushing
the accelerator pedal down. If it does not, your
vehicle needs service. Turn off the engine.
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Notice: Engine damage from running your
engine without coolant is not covered by your
warranty.
Notice: Using coolant other than DEX-COOL
may cause premature engine, heater core,
or radiator corrosion. In addition, the engine
coolant could require changing sooner,
at 30,000 miles (50 000 km) or 24 months,
whichever occurs first. Any repairs would
not be covered by your warranty. Always
®
use DEX-COOL (silicate-free) coolant in
your vehicle.
How to Add Coolant to the Coolant
Recovery Tank for Gasoline Engines
If your vehicle has a diesel engine, see "How
to Add Coolant to the Coolant Recovery Tank"
under "Van Models" in the Cooling System section
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of the DURAMAX Diesel Supplement for the
proper coolant fill procedure.
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