Does Low Engine Coolant Temperature Affect Fuel Consumption?

[Felix]

Low engine coolant temperature can affect fuel consumption. Normal coolant temperature: The normal operating temperature of engine coolant is typically around 90-98°C. Both excessively high and low temperatures are problematic - at minimum affecting engine efficiency, and at worst potentially causing complete engine failure. Low coolant temperature tends to increase fuel consumption, incomplete fuel combustion leads to excessive exhaust emissions, and can also cause engine wear, negatively impacting engine lifespan. Causes of low coolant temperature: Thermostat failure where the valve cannot close, keeping coolant in constant circulation through the main radiator circuit. The thermostat should be inspected. Continuously running cooling fans - for electric fans, circuit faults may cause constant operation; for viscous-coupled fans, damage to the silicone fluid clutch can also cause continuous operation. These malfunctions will all result in low coolant temperature and should be repaired promptly.