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What Is The Average Normal Coolant Temp?

For most modern vehicles. Celsius’s average operating engine temperature is somewhere between seventy-five (75) to one hundred five (105) degrees Celsius. If it reaches eighty (80) to ninety (90) degrees, the thermostat will allow the cooling fluid to flow through the other cooling circuit.

If the temperature continues to rise, the radiator fan will then cool the engine. The cooling system of an engine is a complicated component, and if there are malfunctions, this can lead to overheating. In terms of Fahrenheit, the average operating engine temperature is somewhere between the range of one hundred ninety-five (195) to two hundred twenty (220) degrees Fahrenheit.

However, most of the dashboard temperature gauges do not show an accurate temperature. There are just markings for the cold and then the hot on the edges of the gauge.

The normal range will be in the middle. Most of the cars have a temperature needle near the center of the engine at an average operating temperature, and it will take at least a minute or two for the engine to get cold.

What Temp Is Too High For Coolant?

In Celsius, most modern vehicles have an average operating temperature somewhere between the range of seventy-five (75) to one hundred five (105) degrees Celsius. If the temperature rises beyond the temperature, the radiator fan (electric) will start to cool the engine.

In Fahrenheit, if the engine’s temperature exceeds two hundred thirty (230) degrees Fahrenheit, the engine will overheat. So above the two hundred forty-five degrees Fahrenheit, then there will be damages to occur.

SOURCE - https://piketransit.com/average-coolant-temp/

Without a certified MECHANICAL WATER TEMP TEST GAUGE, it is all a guessing game.

Also, think of it this way. It is like your home water heater. The higher the set temp, more of suspended particulates will fall out of suspension in the water and settle at the bottom and begin to eat the tank lining. Same as the sediments you see in the cooling jackets.

DO NOT use tap water to either flush or fill. At the very minimum, distilled. One reason pre-mix coolant is used on modern cars.

A modern engine (FYB) needs to see a minimum of a 180 degrees (thermostat) to have oil detergents/dispersants work properly and to eliminate any moisture in the crankcase.

Low operating temp also cause a rich condition in fuel delivery and that thins the oil.

It's as simple as that.