1997 Pontiac Grand Prix Owner's Manual - Page 299

Radiator Pressure Cap Turning the radiator pressure cap when the engine and radiatorare hot can allowsteam and scalding liquidsto blow out and burnyou badly. Withthe coolant recovery tank, you will almost never have to add coolant at the radiator. Never turn the radiatorpressure cap even a little when the engine and radiator are hot. NOTICE: Your radiator cap is a 15 psi (105 kPa) pressure-type cap and must be tightly installed to prevent coolant loss and possible enginedamage from overheating. Be sure the arrows on the cap line up with the overflow tube on the radiator filler neck. When you replace your radiator pressure cap, an AC' cap is recommended. -- -- Add coolant mix at the recovery tank, but be careful not to spill it. Thermostat You can be burned if you spillcoolant on hot engine parts. Coolant contains ethylene glycol, and itwill burn if the engine parts are hot enough. Don't spill coolant on a hot engine. I 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 a preset temperature. I When you replace your thermostat, an AC@thermostatis recommended. 6-29