Quick Answer: When should radiator fan come on?

Should radiator fan run all time?

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.

How can I tell if my radiator fan is working?

If your radiator fan has a fan clutch, check the radiator fan while the motor is running. The radiator fan should be running at more RPMs than the motor. If it is not, the fan clutch is bad and needs to be replaced. Some radiator fans are solid mounted, with no fan clutch.

Why is my radiator fan not coming on?

Defective temperature switch, coolant sensor or other sensor. Engine thermostat is stuck OPEN (engine never gets hot enough to turn on the fan ) Faulty fan relay. A wiring problem (blown fuse, loose or corroded connector, shorts, opens, etc.)

How long should a radiator fan run?

How often should my radiator fan run? 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.

What sensor controls the radiator fan?

Faulty 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.

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Why is my radiator fan so loud?

Worn bearings, bent or broken blades, and unbalanced rotating assemblies can cause a fan to screech, howl, or otherwise make noises it shouldn’t. If you have a noisy radiator fan, don’t put up with it any longer than you have to. Our expert mechanics are here to help with all your vehicle service needs.

Should radiator fan turn on when AC is on?

Both radiator fans should always run when the AC compressor is engaged. 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.

Can you run a car without a radiator fan?

Yes, technically your engine does not need a cooling fan to operate. If the radiator does not have cool air blowing on it constantly, it will overheat eventually, so you ‘d need the perfect combination of weather and traffic to drive effectively without a radiator fan.

How much does it cost to fix a radiator fan?

The Best in Auto Repair The average cost for radiator fan motor replacement is between $591 and $624. Labor costs are estimated between $111 and $140 while parts are priced between $480 and $484. This range does not include taxes and fees, and does not factor in your unique location. Related repairs may also be needed.

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.

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Is there a fuse for the radiator fan?

The cooling fan relay is normally located in either the underhood fuse and relay center or mounted to the electric fan assembly behind the radiator. Warning: It is possible for the radiator cooling fan to operate with the ignition key in the “off” position. Keep area around the fan blade clear in order to avoid injury.

At what temperature does the radiator fan turn on?

Your radiator fan should kick in at about 200 degrees Fahrenheit. If you notice your vehicle is overheating or at the very least running hotter than it normally does, listen for the fan to see if you can hear it.

Does the coolant temp sensor control the fan?

The sensor works by measuring the temperature that’s being given off by the thermostat and/or the coolant itself. The temperature is then sent to the on-board control system. As the control system receives the temperature from the CTS, it may trigger the cooling fan to either shut off or turn on.

Why does my radiator fan turn on and off?

To avoid a further rise of temperature, the fan induces air flow. 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.

Does thermostat control radiator fan?

It controls coolant flow to your radiator. If you have a mechanical cooling fan, most likely it is controlled by a viscous clutch, which is activated by air temperature hitting the fan, not coolant temp. The thermostat being forced open could cause the fan to Operate earlier than it normally would.

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