What is the reason for the constant rotation of the cold car fan in the Besturn B50?
3 Answers
The reason for the constant rotation of the cold car fan in the Besturn B50 is damage to the thermal switch, damage to the fan relay, or damage to the air conditioning pressure switch. Working principle of the cold car fan: The cold car fan generally has a noticeable cooling effect of 4-15 degrees. After the temperature drops, the air is rapidly replaced, and the air quality quickly improves. When the cold fan is turned on, negative pressure is generated inside the cavity, drawing external air through the efficient evaporative water curtain to lower the temperature, transforming it into cool fresh air that blows out from the air conditioning vents. The outlet temperature can reach 5-15 degrees, with power consumption of only 1 kWh per hour. Function of the cold car fan: The car engine must be properly cooled in high-temperature working environments to maintain it at an appropriate operating temperature, ensuring good engine performance, durability, and exhaust emission requirements. The cooling system plays a key role here, mainly including components such as the cooling fan, radiator, and thermostat.
Seeing the Besturn B50's cooling fan running continuously when cold, I think this may be related to several technical points. The most common issue is a malfunctioning coolant temperature sensor, which can mistakenly perceive the engine as overheating and command the fan to operate. Another possibility is that the fan relay is stuck or in a short-circuit state, preventing normal switching. If there's a bug in the engine control unit's software, it might erroneously send commands during cold starts, causing the fan to run continuously. Poor contact due to aging wiring or grounding issues are also potential root causes. A fan running continuously like this not only consumes excessive electricity, quickly draining the battery, but may also overheat and damage motor components. Prolonged operation in this state is detrimental to the vehicle's overall health, so it's best to visit a professional shop as soon as possible to diagnose specific trouble codes before proceeding with repairs.
I've encountered a similar situation where the fan keeps running when the engine is cold. I suggest doing a simple check yourself first. Open the hood and inspect whether the fan fuse is intact, gently shake the relay to listen for any abnormal sounds, or simply unplug the coolant temperature sensor to see if the fan stops. The issue is mostly caused by a damp and oxidized sensor or loose wiring contacts. A continuously running fan can also lead to premature battery failure, so it's advisable to use the starter more often to test the battery status when parked. Those unfamiliar with electrical systems should avoid rash actions to prevent mishandling. Consulting the repair manual or seeking help from a nearby technician is the most hassle-free and cost-effective solution.
