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.
Where is the cooling fan sensor located?
Where Is the Engine Coolant Temperature Sensor Located? The ECT sensor is typically near the thermostat in the cylinder head or thermostat housing. The ECT sensor is typically near the thermostat in the cylinder head or thermostat housing.
How does a radiator fan sensor work?
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.
What are the signs of a failing temperature sensor?
7 Symptoms of a Bad Coolant Temp Sensor & Cost to Fix
- Check Engine Light.
- Engine Overheating.
- Poor Fuel Economy.
- Poor Engine Performance.
- Broken Water Pump.
- Control of Cooling Fan.
- Black Smoke From Exhaust Pipe.
What ECU controls the radiator fan?
CIRCUIT OPERATION
The engine-ECU <M/T> or engine-A/T-ECU <A/T> controls the fan controller to activate the radiator fan motor and the condenser fan motor.
What causes a radiator fan to not turn on?
The most common reasons why a radiator fan is not working are due to a blown fuse, a bad relay, or a broken wire. It can also be caused by a faulty coolant temp sensor, low coolant level or the fan itself can be damaged.
Where is the radiator coolant sensor located?
In most cars, the primary ECT sensor (ECT sensor 1) is installed near the thermostat in the cylinder head or block or on the thermostat housing. A second coolant temperature sensor could be installed in another part of the engine, or in the radiator.
How do I know if my radiator fan relay is bad?
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.
How do I know if my radiator fan switch is bad?
The best way to tell if your cooling switch is faulty is to listen to your engine while you drive. You know how your engine is supposed to sound, and if you notice that you don’t hear the fan as often as you normally do during your afternoon commute, you might have a failing switch.
What happens when the coolant temperature sensor goes out?
Your Engine is Overheating
While a failing engine coolant temperature sensor may give a permanent cold signal, it can also malfunction in a way that sends a hot signal when your engine temperature is safe.
What happens if coolant temp sensor is bad?
The coolant temperature sensor can fail and transmit cold signals to the computer. This action confuses the computer and stimulates it to enrich the fuel mixture unnecessarily. This can cause the fuel mixture to be vibrant such that during combustion, the fuel can’t be adequately consumed within the chamber.
Where is the radiator temperature sensor located?
Does the ECM control the cooling fan?
Make sure the A/C is turned off, because you don’t want the fans coming on as a result of high side pressure in the A/C system. Electric fans generally are controlled by a relay, which in turn is controlled by the Engine Control Module (ECM).
What controls the speed of the radiator fan?
The PCM controls fan operation; it uses the signal from the ECT or engine coolant temperature sensor. This sensor senses the temperature of the engine’s coolant and sends a variable voltage signal to the PCM. The PCM operates the fan motor through the engine’s cooling fan relay.
Does the thermostat control the radiator fan?
The thermostat found in the cooling system will control many of the electric fans. When a certain preset temperature has been reached by the car engine, the radiator fan will begin to cool the engine. The fan will turn off eventually if the temperature goes below the preset engine temperature.
Is there a relay for the radiator fan?
The cooling fan relay is an electromagnetic switch that controls the power supply to the engine’s cooling fans. It ensures that the energy-intensive devices only run when needed, usually when the vehicle is immobile.
Is there a fuse for coolant temperature sensor?
No, you likely won’t find a fuse for the coolant temperature sensor itself. You can find a fuse for the engine control module though, which sends the signal to the coolant temperature sensor.
How do you test a coolant sensor?
Submerge the sensor in the water and take a reading.
Wait a minute or so for the screen to give you a reading of the cold water. Once you have a reading, write down the measurement for reference. A common reading for a temperature sensor in cold water is around 5 volts.
How do I know if my fan control module is bad?
Symptoms of a Cooling Fan Module Failure
- An overheating engine. When the cooling fan module fails completely, the cooling fans will not work at all.
- Cooling fans running non-stop.
- Poor circulation of fresh air in the cabin of the car.
Should radiator fan run when AC is on?
Q: Should the radiator fan run when AC is on? Yes. Both the radiator and condenser cooling fan are expected to turn on the moment you switch on the air conditioning system. For instance, it is expected for the cooling fan to switch on when the engine carries loads or once it reaches the normal operating temperature.
How do you test a radiator fan switch?
Coolant Fan Switch Testing WITHOUT Removing From The Vehicle
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.
Can a bad temperature sensor cause fan not working?
Broken Coolant Temperature Sensor
A broken coolant temperature sensor can also make the radiator fan not work as well. When this sensor fails it may cause overheating in the process. This sensor may also relate to other different symptoms as well.
Are there 2 coolant temperature sensors?
There are two temperature sensors in some vehicles, one to send information from the engine system to the control unit and another from the control unit to the dashboard.
How do I know if my temperature sensor is working?
The main symptoms of a bad or failing coolant temperature sensor include:
- Check Engine Light.
- Poor Mileage.
- Electrical Cooling Fans not coming on.
- Black Smoke from the Exhaust Pipe.
- Hard Start Condition.
- Engine Overheats.
- Poor Idling.
- Poor Engine performance.