Normal Operating Temperatures of a 1997 Grand Marquis

Through the 1980s, 1990s and 2000s, the Grand Marquis sat atop Mercury's lineup as its luxury, full-sized sedan. The 1997 Mercury Grand Marquis came fitted with a 4.6-liter V-8 engine that produced 190 horsepower and 265 foot-pounds of torque. As with all vehicles, the 1997 Grand Marquis has an acceptable range of normal operating temperatures.

Mechanics

The five main components that regulate the Grand Marquis' temperature are: coolant, water pump, thermostat, radiator and cooling fan. These components combine to help maintain the Grand Marquis' engine's normal operating temperature range of between 192 and 219 degrees Fahrenheit.

Failures

If any of the 1997 Grand Marquis' cooling system components fail, it can cause either overheating or over-cooling. Both symptoms may cause engine damage, however, overheating can cause more immediate damage, whereas over-cooling kills slowly.

How it Works

When you start your Grand Marquis, the coolant in the engine is cold. The thermostat remains closed, allowing the coolant to warm up with the engine. Once the coolant temperature reaches 192 to 199 degrees Fahrenheit, the thermostat starts opening, and the water pump pushes the coolant through the radiator and back into the engine. Once the coolant reaches approximately 219 degrees, the cooling fan turns on and lowers the coolant temperature in the radiator.