Should radiator fan come on when car starts?

Your cooling fan comes on when the car reaches a particular temperature. Extra cooling is not needed when a cold engine is first started, so the fan does not come on until the engine reaches normal operating temperature (195 to 215 degrees).

Why is my radiator fan always on?

It is possible that this problem of your car’s fans constantly running is some sort of mechanical or electrical error from a poor sensor or other component. There are temperature sensors and some cars have separate sensors for the gauge itself. The fan can be shut off when the engine temperature warrants.

How often should radiator fan come on?

But, on a normal 70–80 degree day you should hear the fan run, I would guess, after about 15 to 20 minutes of idling from a cold start. When the electric cooling fan operates is purely a function of the setting of the temperature switch used to control power to the fan.

What are the symptoms of a faulty cooling fan switch?

Bad Cooling Fan Relay Symptoms

The engine runs hot or overheats.
The cooling fans don’t work.
The cooling fans keep running.
Warning lights.
Poor air conditioning performance.
Swapping Relays.
Measuring the Relay Coil’s Resistance.
Listening for Noises.

Why does my radiator fan not turn on?

If the fan doesn’t come on, you need to look for a blown fuse or breaker. In older cars, you might have a fusible link – this is wire within an insulated block of rubber. Try to grab the end and stretch it. If the wire stretches, the wire link could be broken and you’ll need to replace it.

Can you drive without radiator fan?

Yes, you can drive your car without a radiator fan, but you never should. Your vehicle’s cooling system is crucial to its performance, and every time your engine overheats, you cause damage.

Is it bad to have radiator fan always on?

An electric fan SHOULD NOT run all the time. The fan turning on is normal and a consequence of the hot coolant, not a cause. The coolant may not be moving due to a water pump problem, blockage in the radiator or hoses, or a stuck valve, i.e., the “thermostat” in the coolant line.

Why does the radiator fan turn on and off?

vehicles with electronic cooling fans turn on and off to help regulate the engine temperature. if the regulator senses that is getting too hot it kicks the fan on to cool the radiator down. when it is cooled down enough it kicks off and allows the engine to heat back up.

What sensor controls 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.

Can a bad thermostat cause radiator fan not to work?

If the thermostat is stuck open (allowing coolant to flow) it can cause the engine to run cooler than normal so obviously the fan wouldn’t come on..but not like the engine/coolant can be running too hot and the thermostat somehow effects the sensor reading or operation of the fan.

Why does my radiator fan run full speed when I start the car?

Immediately upon starting the car, the radiator fan begins to run full speed, even though the car is stone cold. The AC is OFF. The radiator and condenser are BRAND NEW. This problem existed before and after the radiator was replaced. The fan continues to run at its maxiumum speed, regardless of the engine temperature.

When does the cooling fan come on in a car?

Beside above, when should the cooling fan come on? To check the temperature at which the fan comes on, turn the A/C off and keep the engine running until it reaches normal operating temperature. 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.

Is the radiator supposed to turn on when AC is on?

Both radiator fans should always run when the AC compressor is engaged. Both radiator fans should always run when the coolant temperature sensor in the bottom tank of the radiator reaches about 212*F. Click to see full answer. Then, is the fan supposed to be on when AC is on? The fan only turns on when cooling or heating (in winter) is required.

What is the function of the radiator fan?

The radiator fan is in charge of pulling cool air through the car’s radiator. What Is The Function Of The Radiator Fan? The radiator fan is positioned between the radiator and the engine, and is in charge of cooling the car.