1998 Buick LeSabre Owner's Manual - Page 273

Adding Coolant Radiator Pressure Cap NOTICE: Your radiator capis a 15 psi (105 kPa) pressure-type cap and must tightly installed to be prevent coolant loss and possible enginedamage from overheating. Be sure the arrows the cap on line up with the overflow tube on the radiator filler neck. When you replace your radiator pressure cap, aGM cap is recommended. If you need more coolant,add the proper DEX-COOL' coolant mixtureat the coolant recovery tank, but be careful not to spill it. Turning theradiator pressure capwhen the engine and radiator are canallow steam and hot scalding liquids to blow out andburn you badly. With the coolant recovery tank, you will almost never have to addcoolant at the radiator. Never turn the radiator pressure cap even a little when the engine and radiator are hot. -- -- Thermostat Engine coolant temperature is controlled by a thermostat in the engine coolant system. The thermostat stops the flow of coolant through the radiator until the coolant reaches apreset temperature. You can be burnedif you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engine parts arehot enough. Don't spill coolant on a hot engine. 6-23