What is the reason for the electric fan not working after replacing the coolant?
2 Answers
Reasons for the fan not working after replacing the coolant are as follows: Abnormal circulation: The operation of the fan can indicate whether the coolant is circulating normally in the car. It is essential to use high-quality coolant of the same brand and model. Coolants of different brands and colors should not be mixed, as their formulations may vary. Mixing different coolants could lead to chemical reactions, affecting the performance of the coolant. Reasons for the fan running continuously: If the fan keeps running, it indicates that the engine temperature is high. This could be due to the engine temperature exceeding the fan activation threshold or a malfunctioning sensor.
I've experienced a similar issue before. There are quite a few reasons why the electric fan might not work after changing coolant. First, air might have entered the system during the coolant change process. Air bubbles can block the temperature sensor signal, causing the ECU to misjudge that no fan cooling is needed. Second, you might have accidentally touched the fuse or relay of the fan circuit during operation. A blown fuse is a common fault - I once found and replaced a burnt fuse in the fuse box to fix it. Another possible reason could be loose wiring connections or short circuits caused by water ingress, such as coolant splashing on connectors leading to power interruption. Don't forget to check if the fan motor itself is burnt out. For safety, after changing coolant, make sure to fully bleed the system and quickly inspect these areas to prevent engine overheating damage. Last time, I spent time re-bleeding the system and testing continuity to solve the problem, avoiding greater losses.
