What should the car coolant temperature be?

1 Answers
McAmy
07/29/25 10:11am
Engine temperature is typically monitored by a coolant temperature sensor, hence the normal operating temperature of the engine is often associated with coolant temperature. Generally, the optimal engine coolant temperature is 90°C, but it varies under different operating conditions. In a cold engine state, it may be around 85°C, while in a warmed-up state, the coolant temperature can exceed 100°C. However, 90°C is commonly regarded as the normal coolant temperature for an engine, though in actual driving conditions, it may fluctuate around this value. Below is relevant information: When the coolant temperature reaches 90°C, it indicates that the engine's heat generation has stabilized. Both excessively high and low coolant temperatures can damage the engine. Low temperatures are detrimental to engine lubrication, while high temperatures increase the risk of engine self-ignition. During daily driving, it is important to monitor the coolant temperature indicator on the dashboard. If the red warning light illuminates, do not continue driving; it is advisable to pull over and allow the engine to cool down.
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