What are the symptoms of a faulty fan clutch?

1 Answers
DiSebastian
07/25/25 10:07am
The main function of a fan clutch is to adjust fan operation based on engine coolant temperature changes. Symptoms of a faulty fan clutch include excessive or insufficient airflow. Excessive airflow prevents the engine from reaching optimal temperature promptly, while insufficient airflow leads to engine overheating and operational failure. Below is an analysis of common causes for fan clutch failure: 1. Damaged bimetal temperature sensor: When this component fails, the fan clutch cannot properly engage/disengage according to radiator air temperature changes, remaining constantly disengaged and causing engine overheating. 2. Silicone oil leakage: As the primary transmission medium, significant silicone oil leakage results in power transmission failure. 3. Broken silicone fan drive pin: This causes the oil valve to remain permanently open under spring pressure, allowing continuous oil flow from the reservoir into the working chamber, keeping the fan clutch constantly engaged and delaying engine warm-up.
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