Should radiator fan come on when car starts?

The engine temperature should trigger the fan to turn on. It will also turn the fan off once the engine has cooled to under 200 degrees. You may have heard of a part called the radiator fan switch or temperature fan switch.

What are the symptoms of a faulty cooling fan switch?

Common signs include engine overheating, the Check Engine Light coming on, and a broken or shorter signal wire.

Why does my radiator fan keep running?

This is normal in many vehicles, such as BMW or Mercedes-Benz. The radiator fan may run up to five minutes and sometimes longer. Unless there is an electrical issue, it may stay on all the time until it drains the battery. … Running cooling fans help cool down the engine even after you turn off the car.

Does the thermostat control the radiator fan?

The thermostat is an important tool that your car uses to be properly cooled. … If this thermostat doesn’t open when the engine reaches the working temperature, the coolant will stay inside the engine block and the engine will start to overheat. This will result in the radiator fan not working.

Why Does My car fan come on when I stop?

Engines operate at their most efficient when they’re hot but not too hot. The fan turns on when you’ve stopped driving because no more cooling air is flowing into the engine bay. This causes the temperature to rise, automatically triggering the fan.

How often should radiator fan come on?

Most fans should come on when the coolant reaches about 200 to 230 degrees. If the fan does not come on, something in the control circuit is defective.

What sensor turns on the radiator fan?

coolant temperature sensor
On most modern cars, the cooling fan is controlled by the Engine Control Unit (ECU) which gets a signal from the coolant temperature sensor. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat.

How do I know if my radiator fan motor is bad?

The first symptom or sign that something has gone wrong is that your cooling fan doesn’t come on at all. This is the most common symptom of a faulty cooling fan motor, but it may not be one you notice while driving your vehicle. If the motor burned out or starts to fail in any way, the cooling fans are disabled.

How do I know if my radiator fan fuse is bad?

These are the most common signs of a faulty radiator fan assembly in need of replacement:
  1. Engine Overheating. When the radiator fan isn’t functioning properly, it is not able to adequately cool down the car’s engine. …
  2. Air Conditioner Function Diminished. …
  3. Loud Noise Coming From Radiator Fan.