Chevrolet 2007 Cobalt Owner's Manual page 306

2.0L L4 Supercharged Engine
A. Electric Engine Cooling Fans
B. Intercooler System Pressure Cap
C. Coolant Surge Tank and Pressure Cap
306
CAUTION:
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An electric engine cooling fan under the
hood can start up even when the engine
is not running and can injure you. Keep
hands, clothing, and tools away from any
underhood electric fan.
If the coolant inside the coolant surge tank is
boiling, do not do anything else until it cools down.
The vehicle should be parked on a level surface.
The coolant level should be at the COLD FILL line.
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 in the cooling
system.