1997 Chevrolet Cavalier Owner's Manual - Page 270

Adding Coolant Surge Tank Pressure Cap NOTICE: Your surge tank cap a 15 psi (105 kPa) is pressure-type cap and must tightly installedto be prevent coolantloss and possible enginedamage from overheating. When you replace your surge tank pressure cap, a GM cap is recommended. If you need morecoolant, add the proper DEX-COOL@ coolant mixture at the surge tank, but only when the engine is cool. ~~ A CAUTION: You can be burned if you spill coolanton hot engine parts. Coolant contains ethylene glycol, are and itwill burn if the engine parts hot enough. Don't spill coolant on a hot engine. When replacingthe pressure cap, make sure it is tight. Thermostat Engine coolant temperature is controlled by a thermostat in the engine coolant system. The thermostat stops the flow of coolant through theradiator until thecoolant reaches a preset temperature. When you replace your thermostat, an AC@thermostat is recommended.