Cadillac 2008 CTS - Manual (Page 316)

If the engine is warm or hot, the coolant level should be
at or above the FROID/FULL COLD line on the side
of the coolant surge tank. If the engine is cold, the
coolant level should be near the FROID/FULL COLD
line on the side of the coolant surge tank. If it is not,
you could 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 and 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, with the engine on, check
to see if the electric engine cooling fans are running.
If the engine hot light is on, both fans should be running.
If they are not, your vehicle needs service.
Notice: Engine damage from running your engine
without coolant is not covered by your warranty. See
Overheated Engine Protection Operating Mode on
page 5-32 for information on driving to a safe place
in an emergency.
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 the warranty. Always
use DEX-COOL
® (silicate-free) coolant in the vehicle.
5-34