How Does A Cooling Fan Work? new for 2022


How Does A Cooling Fan Work?

The fans are controlled either with a thermostatic switch or by the engine computer, and they turn on when the temperature of the coolant goes above a set point. They turn back off when the temperature drops below that point. Rear-wheel drive cars with longitudinal engines usually have engine-driven cooling fans.Feb 11, 2021

What controls the cooling fan?

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 cooling fan is working?

Determine whether your radiator fan is manual or electric. To check an electric radiator fan, start the car and let it get up to the temperature where the fan normally kicks on. Use the volt meter to test if there is power to the wires. Normal voltage for a radiator fan is around 12 volts.

How does an electric cooling fan operate?

Cooling fans are driven by the engine’s crankshaft or by an electric motor. They provide airflow through the radiator fins, transferring heat from the engine’s coolant to the outside air. The radiator does not operate effectively without proper airflow.

How do radiator fans turn on?

A mechanical fan is connected to the engine directly by drive pulleys. This type of radiator fan is controlled by a thermal fan clutch that senses radiator heat. After sensing the heat temperature, the radiator fan turns on when the engine is running at a higher temperature.

What causes radiator fan to stop working?

Six things may prevent an electric cooling fan from 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.

When should radiator fans kick on?

about 200 degrees Fahrenheit
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.

Can you drive a car if the radiator fan is not working?

As such, you should never drive your vehicle if the cooling fan isn’t working even though you can. … 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.

What does a bad radiator fan sound like?

In some cases, when your radiator cooling fan clutch fails, it will develop a whirring or clicking noise. The noise could result from a bearing that is out of place or a bent fan blade that is touching other components.

Do radiator fans always spin?

This unit spins when the engine is running, and it always spins at the same rate as the engine. The faster the engine is running the faster the fan will spin. … If you find that your vehicle is not cooling off properly, the radiator fan might be the culprit. You can replace the fan with a new unit.

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Should both radiator fans be 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.

Is a cooling fan and a radiator fan the same thing?

The radiator fan (or fans) pulls cooling air through the car’s radiator. The advent of electric cooling fans, which turn on and off as needed, proved an improvement over engine-driven fans that slow down exactly when they’re needed most. … A failed cooling fan can result in an engine overheating.

Does radiator fan affect AC?

Likewise, does radiator fan affect AC? Yes, a broken radiator fan can cause the air conditiong to stop working. The AC system depends upon being able to dissipate heat into the engine coolant. You really need to have the fan replaced, or at least, have a diagnostic check to see what is causing the fan to stop working.

How do you test a cooling fan?

What are the symptoms of a faulty cooling fan switch?

Keep a lookout for the following 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.

Will a bad thermostat cause the fan not to work?

Broken Thermostat

Thermostats are known to go bad and cause all sorts of cooling issues. … 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.

How do I manually start my radiator fan?

How to Manually Turn on a Radiator Fan
  1. Cut the power and ground wire at the fan harness, leaving 6 inches or more to connect new wires. …
  2. Install the four-terminal relay to a solid mounting location as close to the radiator as possible. …
  3. Attach a spade-end crimp to one end of a 16-gauge wire.

Why does my radiator fan come on when I start my car?

What Is The Function Of The Radiator Fan? The engine contains a combustion chamber where explosions take place to provide power and heat the car. These explosions cause the engine to heat up extremely quickly and can sometimes lead to overheating. This is a reason why the radiator fan turns on when the car starts.

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Why does the engine fan stay on?

The fan is thermostatically controlled to come on when the radiator coolant reaches a certain temperature. You car’s cooling system is probably compromised – either low coolant (due to leaks) or a thermostat problem or radiator issue.

What to do if your cooling fan isn’t working?

Can a broken radiator fan cause overheating?

Engine overheating: A bad radiator fan can cause the engine to overheat, especially at low speeds. If your car starts overheating, pull off the road as quickly as you safely can and turn off the engine. An overheated engine can quickly get ruined and lead to expensive repair bills.

Does the radiator fan have a fuse?

A radiator fan is necessary to keep your car cool. The fuses inside of the radiator fan must be in good working order to make sure that the engine is able to stay cool. Without these components your car overheats. Over time this could create damage that is irreversible.

Why is my engine cooling fan so loud?

One such problematic issue, the excessively loud radiator cooling fan, is a common plague many automobile owners will experience. Your radiator fan should be audible. … Worn bearings, bent or broken blades, and unbalanced rotating assemblies can cause a fan to screech, howl, or otherwise make noises it shouldn’t.

How much does it cost to replace a cooling fan?

Radiator Fan Motor Replacement Cost – RepairPal Estimate. Labor costs are estimated between $130 and $164 while parts are priced between $467 and $470. This range does not include taxes and fees, and does not factor in your specific vehicle or unique location. Related repairs may also be needed.

Which way is a radiator fan supposed to spin?

The fan should blow air toward the engine (i.e., same direction as the air flow when the vehicle is in motion).

Why does radiator have two fans?

The cooling fan in the engine compartment should turn on to pull air through the radiator and A/C condenser. On many vehicles, there may be two fans: a main cooling fan for the radiator, and a second fan for the condenser. … The engine may also run hot and overheat, too.

Can a fan clutch cause overheating?

Overheating engine is the most common symptom of a bad or failing fan clutch. It controls the operation of the cooling fans. These cooling fans will disable/not work at maximum efficiency as the bad clutch will not engage properly. This result in overheating which may lead to serious issues if not timely attended.

Why does my cooling fan fuse keep blowing?

A blown cooling fan circuit fuse is another symptom of a potential problem with the cooling fan motors. If the motors fail or surge, they may cause the fuse to blow in order to protect the rest of the system from any sort of damage due to electrical surges.

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What are 10 common causes of overheating?

What are 10 common causes of overheating?
  • Too little or no coolant. Driving without proper levels of coolant/antifreeze may cause a coolant system failure.
  • Cooling system leaks.
  • A broken water pump.
  • Radiator issues.
  • Oil too low.
  • Thermostat failure.
  • Issues with the belts and hoses.
  • Heater core is plugged up.

What cools the engine in a car?

The radiator transfers the heat from the fluid inside to the air outside, thereby cooling the fluid, which in turn cools the engine. Radiators are also often used to cool automatic transmission fluids, air conditioner refrigerant, intake air, and sometimes to cool motor oil or power steering fluid.

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.

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 is my engine fan not working?

Six things may prevent an electric cooling fan from coming on: … 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 do you turn off a cooling fan manually?

1. Turn off the fan via the BIOS (system setup menu).
  1. The first step is to restart the computer. …
  2. While your computer is booting by hold down the suitable button (depending on your computer manufacturer’s manual) in order to enter the BIOS menu. …
  3. Find the section “Smart Fan“/”Fan Settings” select it.

Why does my cooling fan run after shutting the engine off?

It is ok for the engine cooling fan to keep running for a few minutes after turning off the car. Your car fan will run for a few minutes after you turn off the car then turn it off. … When the engine is turned off, the coolant doesn’t circulate, and the heat stays trapped, therefore prolonging the engine from cooling.

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