What Causes High Coolant Temperature?

1 Answers
StTimothy
07/29/25 12:11am
High coolant temperature is caused by: 1. Insufficient engine coolant; 2. Faulty water temperature sensor or gauge; 3. Driving with tailwind or prolonged low-speed heavy-load operation in hot seasons; 4. Incorrect ignition timing (too early or late); 5. Incomplete opening of the radiator shutters; 6. Overly lean or rich air-fuel mixture; 7. Severe external dirt accumulation or internal scaling in the radiator. Solutions include: 1. Check coolant level in the radiator and top up if insufficient; 2. Inspect fan belt tension and blade angle; 3. Verify if radiator shutters fully open and whether fins are excessively bent or clogged; 4. Observe water pump circulation via radiator filler neck; 5. Remove thermostat from engine coolant outlet pipe for heating test in water; 6. Drain engine block to inspect water jacket scaling.
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