1997 Buick Skylark Owner's Manual - Page 260

Adding Coolant Surge Tank Pressure Cap If you need more coolant, add proper DEX-COOL@ the coolant mixtureat the surge tank, but only whenthe engine is cool. I NOTICE: Your pressure cap is a 15 psi (105 kPa) pressure-type cap and must be tightly installed to prevent coolant and possible engine damage loss from overheating. When you replace your surge tank pressure a GM cap, cap is recommended. I A 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 arehot enough. Don't spill coolant on hot engine. a When replacing the pressure make sureit is tight. cap, I Thermostat Engine coolant temperature controlled by a thermostat is in the engine coolant system. thermostat stopsthe The flow of coolant throughthe radiator until the coolant reaches a preset temperature. When you replace your thermostat, an AC@ thermostat is recommended. 6-25