What is the reason for the car's fan not running at high speed?

[DeAlyssa]

Car radiator fan cannot rotate at high speed due to the failure of the fan itself, which may be caused by a malfunction in the fan's temperature controller or relay. A thorough inspection of the radiator fan is required. If the fan can rotate at low speed, it indicates that the temperature sensor is not faulty. You can open the relay box and swap the positions of the high-speed relay and low-speed relay. If the fan starts running at high speed, it means the high-speed relay is faulty. Below is an introduction to the car's electric fan: 1. Definition: Operated by the engine coolant temperature switch controller, it generally has two-speed levels. The car's air conditioning system also controls the operation of the electric fan when turned on. The electric fan works when the engine needs cooling. 2. Function: It helps minimize the energy consumption of the car engine. The electric fan is usually installed behind the car radiator, although some car models have it installed in front of the radiator. The radiator temperature is regulated by the fan to ensure the proper functioning of the car engine.