1996 Buick Roadmaster Owner's Manual - Page 245

Adding Coolant If you need more coolant, add the proper at the mix surge tank, but only when the engine cool. is Surge Tank Pressure Cap NOTICE: The surge tank cap is a 15 psi (105 kPa) pressure-type cap and must be tightly installedto prevent coolant lossand possible engine damage from overheating. When you replace the surge tank pressure cap,GM cap a is recommended. 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 onhot engine. a When replacing the pressure cap, make sure istight. it Thermostat Engine coolant temperatureis controlled by a thermostat in the engine coolant system. thermostat stops the The flow of coolant through the radiator until the coolant reaches a preset temperature. When you replace your thermostat, an AC@thermostat is recommended. 6-23