1996 Cadillac DeVille Owner's Manual - Page 284

Adding Coolant Surge Tank Pressure Cap If you need more coolant, add the proper at the mix surge tank, but only when the engine is cool. IA 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 a hot engine. I NOTICE: The surge tank cap a 15 psi (105 kPa) is pressure-type cap and must be tightly instalfed to prevent coolantloss and possible engine damage from overheating.Be sure the arrows on the cap line up. When replacing the pressure cap, make sureit is tight. If the surget n pressure cap needs be replaced, a ak to is General Motors cap recommended. Thermostat Engine coolant temperature controlled by a thermostat is in the engine coolant system. thermostat stops the The flow of coolant through the radiator until the coolant reaches a preset temperature. If your thermostat needs to replaced, a General be Motors thermostatis recommended.