Buick 1994 Skylark Owner's Manual page 191

.The coolant level
should be at or above
"FULL COLD." If it
isn't, you may have a
leak in the radiator
hoses, heater hoses,
radiator, water pump or
somewhere else in the
cooling system.
If the coolant inside the coolant surge
tank is boiling,
don't do anything else until it cools down.
I
NOTICE:
Engine damage from running your engine
without coolant isn't covered by your warranty.
If there seems to be no leak, check to see
if the electric
engine fan is running. If the engine is overheating, the
fan should be running. If it isn't, your vehicle needs
service.