The FORD FIESTA 2015 radiator fan is a crucial component of your vehicle’s cooling system. Its primary function is to enhance airflow through the radiator, maximizing cooling efficiency. Radiators rely on substantial air circulation across their aluminum fins for effective heat dissipation. While sufficient airflow is naturally generated at higher speeds, lower speeds or stationary operation necessitate the fan to actively force air through the radiator. Initially, when the engine is cold, the fan remains inactive. As engine temperature increases, the fan engages, initially at a low speed. The fan’s speed escalates to its maximum when the engine reaches its optimal operating temperature or the air conditioning is switched on. Fan speed is dynamically adjusted based on engine speed and temperature – higher engine speeds and temperatures result in faster fan operation.

The radiator fan’s performance is directly linked to engine speed and coolant temperature. A malfunctioning coolant temperature sensor will distort the engine temperature reading interpreted by the engine control unit (ECU), impacting fan operation. The fan operates by either pushing or pulling air through the radiator. Activation occurs through two primary mechanisms: A thermostat, positioned between the engine and radiator, monitors coolant temperature. Once a predefined temperature threshold is reached and the engine’s RPM is sufficient, the fan activates. Alternatively, an electric relay switch detects rising coolant temperature, triggering fan activation.

The radiator fan provides vital functions including: Engine protection by maintaining optimal engine temperature, preventing overheating and ensuring long-term reliability; and Improved fuel economy by reducing reliance on the air conditioning system for cooling.

A car radiator fan (or engine cooling fan) is designed to remove excess heat from the engine. By increasing air circulation through the radiator, it significantly boosts the engine’s cooling capacity. This airflow is achieved through either a push or pull mechanism. Activation is triggered in two ways: Method 1: Thermostat Control – The thermostat regulates coolant temperature. When the coolant surpasses a certain temperature and the engine reaches a specific speed, the fan engages. Method 2: Electrical System Activation – The electric relay switch senses rising coolant temperatures, activating the fan.