What Causes Slow Rotation Speed of Car Cooling Fan?

1 Answers
PaulFitz
07/30/25 1:03am
Car cooling fan rotation speed slows down due to the following reasons: 1. Circuit failure: The most common cause is circuit failure in the fan motor leading to reduced speed. 2. Fan clutch malfunction: If the circuit is functioning properly, inspect the fan clutch to check if it remains engaged causing failure to disengage. 3. Switch failure: Faulty temperature control switch of the fan results in decreased rotation speed. Additional information: The primary function of the cooling system is to dissipate heat into the air to prevent engine overheating, but the cooling system also serves other important purposes. A car's engine operates most efficiently at appropriately high temperatures. If the engine cools down excessively, it accelerates component wear, thereby reducing engine efficiency and increasing pollutant emissions.
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