![]() Instead, the temperature gauge will remain in the middle as long as the coolant temperature is within range, and only as it crosses 105C or 220F will it begin to move. But keep in mind that the standard coolant temperature gauge has a 5-7 degree Celsius buffer, so you won’t notice all these fluctuations in real-time. This is why as soon as you open the throttle, the ECU opens the thermostat to cool down the combustion chamber and then advances ignition timing to free up more horsepower from the engine. But a hotter combustion chamber requires a retarded ignition timing which lowers performance. The reason manufacturers set them up this way is that a hotter combustion chamber means the fuel burns more efficiently and causes less pollution. It’s also worth mentioning that coolant temperature fluctuations are entirely normal, and you will notice that the engine is running hot while cruising and cools down as soon as you start to accelerate a little harder.Īt least, that’s the case for engines that have electronically controlled thermostats. But since most vehicles don’t have temperature numbers on the coolant temperature gauge, the normal operating temperature is right in the middle.Īnything past the middle is considered running hot, and anything under that is running cold. That goes for both gasoline and diesel engines. Most vehicles, regardless of engine size or fuel type, run with a coolant temperature of 190 to 220 degrees Fahrenheit. And for some vehicles, it’s normal for the coolant temperature to drop down to 180F (80C) or rise up to 230F (110C). ![]() But the temperature ranges between 195F and 220F, or 90C to 105C. The average coolant temperature for most vehicles and engines is 95 degrees Celsius or 205 Fahrenheit. But what is a normal operating temperature? At that optimal temperature, all the moving parts expand just enough so that they hold oil pressure and that there is no blow past the piston rings. All internal combustion engines run optimally at a specific temperature, not too cool or too hot.
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