1998 Cadillac DeVille Owner's Manual - Page 312

Adding Coolant If you need more coolant, add the proper DEX-COOL@ coolant mixtureat the surge tank, but only when the engine is cool. Surge Tank Pressure Cap I NOTICE: The surge tank cap is a psi (105 kPa) 15 pressure-type cap and must be tightly installed to prevent coolant loss possible engine damage and from overheating.Be sure the arrows on the cap line up. If the surge tank pressure cap needs to be replaced, a GM cap is recommended. r- You can beburned if you spill coolant on hot engine parts. Coolant contains ethylene glycol, and it will burn if the engineparts are hot enough. Don't spill coolant onhot engine. a When replacing the pressure make sure itis tight. cap, 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 be replaced, a GM thermostat is recommended. 6-25