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What Causes Fluctuating Car Engine Coolant Temperature?

1 Answers

MacPiper

07/30/25 6:43am

Fluctuating car engine coolant temperature can be caused by: 1. Faulty coolant temperature sensor; 2. Damaged thermostat; 3. Cooling system malfunction. It's necessary to check whether the engine cooling system has leaks and whether the water pump continues to function properly, as these can also cause the coolant temperature to fluctuate. Taking a damaged thermostat as an example, its function is to automatically adjust the amount of water entering the radiator based on the coolant temperature, changing the water circulation range to regulate the cooling system's heat dissipation capacity and ensure the engine operates within the appropriate temperature range. You can check by feeling the temperature difference between the thermostat's inlet and outlet pipes - if the thermostat is damaged, it will affect the engine's normal operating temperature, resulting in unstable coolant temperature gauge readings.

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