2004 Pontiac Sunfire Owner's Manual - Page 251

If the low coolant light comes on and stays on, it means you are low on engine coolant. See Low Coolant Warning Light on page 3-30. {CAUTION: You can be burned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts are hot enough. Do not spill coolant on a hot engine. When replacing the pressure cap, make sure it is hand-tight. Adding Coolant If you need more coolant, add the proper DEX-COOL® coolant mixture at the surge tank, but only when the engine is cool. If the surge tank is empty, a special fill procedure is necessary. See Engine Overheating on page 5-24 for instructions on "How to Add Coolant to the Coolant Surge Tank." Coolant Surge Tank Pressure Cap Notice: If the pressure cap is not tightly installed, coolant loss and possible engine damage may occur. Be sure the cap is properly and tightly secured. 5-23