Asked by: Pasquale Pacocha PhD
Score: 4.4/5 (25 votes)
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.
Are radiator fans supposed to spin?
Temperature will often determine the time that a radiator fan starts up. A temperature-sensitive switch functions to turn the fan on and off periodically. Radiator fans are designed to start when the temperature of the engine coolant reaches around 200 degrees Fahrenheit.
Why are my radiator fans not spinning?
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.
How can you tell if your radiator fan is bad?
These are the most common signs of a faulty radiator fan assembly in need of replacement:
- Engine Overheating. When the radiator fan isn't functioning properly, it is not able to adequately cool down the car's engine. ...
- Air Conditioner Function Diminished. ...
- Loud Noise Coming From Radiator Fan.
When should the radiator fan kick 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.
27 related questions found
Can you drive without 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.
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.
What sensor controls the radiator 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.
Why is my car overheating when the coolant is full?
In general, it's because something's wrong within the cooling system and heat isn't able to escape the engine compartment. The source of the issue could include a cooling system leak, faulty radiator fan, broken water pump, or clogged coolant hose.
Which way is the 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 is my radiator 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.
Why is my car fan wobbling?
If there is any wobble in the fan, there is a bad bearing in the fan clutch, or a worn bearing on the water pump shaft. A bad water pump bearing will usually cause the water pump to leak and/or make noise, but not always. ... If it feels tight (no play or wobble), replace the fan clutch.
How do I know if my Headgasket is blown?
Bad head gasket symptoms
- White smoke coming from the tailpipe.
- BUBBLING IN THE RADIATOR AND COOLANT RESERVOIR.
- unexplained coolant loss with no leaks.
- Milky white coloration in the oil.
- Engine overheating.
How can you tell if a car thermostat is bad?
Symptoms of a Failing Car Thermostat
- The temperature gauge reads high and the engine overheats.
- The temperature changes erratically.
- The vehicle's coolant leaks around the thermostat or under the vehicle.
How much does it cost to replace a radiator fan?
As one of the more expensive car repairs needed (not including the replacement of a seized car engine, obviously), the replacement of the radiator coolant fan could incur about $128 to $162 in labor costs and around $465 in parts. So, total radiator fan replacement cost could be anywhere from $592 to $627.
Can a bad thermostat cause radiator fan not to work?
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 can I test my radiator fan?
How to Check a Radiator Fan
- 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.
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.
Is the radiator fan the same as the cooling fan?
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 the radiator fan affect the AC?
A lousy radiator fan can create car air-condition (AC) issues. ... The radiator fan pulls air through the condenser, which removes the heat vapor of the refrigerant inside. If the radiator fan fails, it will affect the AC performance.
Can I Straight Wire my radiator fan?
Connect one end of the 12-gauge jumper wire to the black ground wire of the fan. Connect the other end of that wire to the engine block or any metal part of the car body. ... When the wire touches the positive terminal of the battery, the fan should come on.
Can you drive with a broken radiator fan blade?
Can you drive with a bad radiator fan? Yes, if your radiator cooling fan fails, you can drive with it. Technically, your vehicle engine does not need a radiator fan to operate. However, if your vehicle engine does not receive enough air blowing it constantly, it will eventually lead to overheating.
How long does it take to fix a radiator fan?
It varies from person to person. A mechanic can do it in 2 to 3 hours. A person doing it for the first time may have trouble locating the bolts and other parts and could take up to 8 hours to locate.
How long does a radiator fan last?
In most cases, a properly maintained radiator fan will last between eight and ten years. When the radiator fan fails, it should be replaced as soon as possible. This is because without a cooling fan to help remove heat from the engine, your car is more likely to overheat and cause damage to important engine components.
What are the signs of a bad water pump?
Five Signs Your Water Pump Is Failing
- Overheating. A dead or dying water pump cannot circulate coolant through your vehicle's engine and, as such, the engine will overheat. ...
- Coolant Leaks. Coolant leaks from the water pump are common and a clear sign that it's time to replace the pump. ...
- Corroded Water Pump. ...
- Whining Noises.