Passenger cars mostly use electric fans. They are frequently used as extractor fans but also as pressure fans. As more air circulates the engine radiator when the fan is running, optimal coolant temperature regulation is ensured for every vehicle operating condition. The vehicle front usually houses additional radiators (e.g. charge air, steering, fuel, condenser), whose media (air, oil, fuel, coolant) are also cooled by electric fans.
The control of the single or double fan(s) occurs via pressure and/or temperature switches or a control unit. Depending on operating conditions, it is therefore possible to control the fan speed gradually (switch) or flexibly (pulse width-controlled). For electronically-controlled fans, the control unit is often situated near the fan unit. Thanks to a diagnosis device/oscilloscope, it is possible to read the error memory and/or control the drive. Possible error causes are mechanical damage (crash, storage damage, broken guide vane) and electric errors (contact error, short circuit, defect switch/control unit).
The single or multiple electric radiator fan(s) are usually mounted to fan frames. Those mostly have the task of directing the air from the radiator directly, and ideally without flow losses, to the fan. For this reason, the fan frame is mounted as closely as possible to the radiator.