Why is the radiator fan not working on my Lexus ES300?

Possible Causes for Radiator Fan Not Working on a Lexus ES300
There can be several reasons why the radiator fan is not working on a Lexus ES300. Here are some possible causes based on the search results:
1. Faulty Fuse or Relay: One possible cause is a faulty fuse or relay. The 30A RDI FAN fuse located in the fuse box by the battery should be checked. If the fuse is good, then the relays should be inspected as well.
2. Coolant Temperature Sensor: Another possible cause is a malfunctioning coolant temperature sensor. The coolant temperature sensor, located on the radiator, is responsible for signaling the fan relays to energize and start the fans. If the sensor is faulty, it may not send the correct signal to activate the fans.
3. Disconnected or Damaged Wiring: Disconnected or damaged wiring can also prevent the radiator fan from working properly. It is recommended to check for voltage (12 volts) between the fan’s wiring to ensure that power is reaching the fans. If there is no power, it could indicate a problem with the wiring.
4. Accidental Contamination: Accidentally getting oil and coolant on the fans and motor could potentially cause the motors to not work. If this occurred, it is possible that the contamination affected the functionality of the fans. Cleaning the fans and motor properly may help resolve the issue.
Troubleshooting Steps
To diagnose and troubleshoot the issue further, you can follow these steps:
1. Check the 30A RDI FAN fuse located in the fuse box by the battery to ensure it is not blown.
2. Inspect the coolant temperature sensor located on the radiator to ensure it is functioning properly.
3. Verify that there is voltage (12 volts) reaching the fans by checking the wiring.
4. If the fans were accidentally contaminated with oil and coolant, clean them thoroughly to remove any residue that may be affecting their operation.
If these troubleshooting steps do not resolve the issue, it may be necessary to consult a professional mechanic or refer to the vehicle’s service manual for further guidance.
Please note that these suggestions are based on general information and it is always recommended to consult a qualified mechanic or refer to the vehicle’s specific service manual for accurate diagnosis and repair instructions.

What stops a radiator fan from working?

A signal from the coolant temperature sensor is what triggers the ECU to turn on the radiator fan, and if it’s faulty, it can prevent the fan from working at all. Test the fan relay. Since the relay operates as a switch for the fan’s power, a defective cooling fan relay won’t energize the circuit.

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

Can I Drive My Car If The Fan Is Not Working? Yes, your car can still run without a radiator fan, but you never should. Your vehicle’s cooling system is crucial to the engine’s performance and lifespan. Every time your engine overheats, you’re causing tremendous damage to the precious engine.

How do I know if my radiator fan fuse is blown?

You might see a temperature light pop up on your dashboard. In this case stop driving immediately. And turn off your car. The fifth symptom is a blown cooling fan fuse.

Why are my radiator fans not kicking on?

The most common reasons for a radiator fan not working can be a blown-out fuse, a bad relay, or a broken wire. The faulty coolant temp sensor might also be a reason behind it. Whatever the case, a dysfunctional radiator fan can be fatal.

Is there a fuse for the radiator fan?

And sometimes a minimum sign as well make sure the engine is cold and open the container carefully. And then fill it up with antifreeze up to the maximum. Mark.

How do you know if your radiator fan switch is bad?

Check Engine Light and Overheating
Intermittent aside, if your check engine light comes on while you’re driving, it could mean your cooling fan switch is failing.

Why is the radiator fan not working on my Lexus ES350?

The most common reasons a Lexus ES350 radiator fan isn’t working are the fan assembly, the fan clutch, or the coolant temperature sensor.

Should radiator fan turn on when AC is on?

First, run the AC and see if the radiator fan runs: it’s supposed to run with the AC by default. If it doesn’t run, you likely have a low level of refrigerant in the system or a faulty switch or a sensor, or a bad fan motor, fuse, relay, or a wiring problem.

What sensor turns on the radiator fan?

Yes, the coolant temperature sensor is an important component in controlling the radiator fan in many modern vehicles. The coolant temperature sensor monitors the temperature of the engine coolant and sends this information to the engine control module (ECM), which uses it to determine when to turn on the radiator fan.

What activates the radiator fan?

A cooling fan in a car is activated by two means – either by the thermostat in the car’s cooling system, or by an electronic system that senses when the coolant is too hot and switched on the fan through an electrical relay switch.