Why is the radiator fan not working on my Lexus LS430?

Possible Reasons for Radiator Fan Not Working on Lexus LS430
There are several potential reasons why the radiator fan may not be working on a Lexus LS430. These include issues with the fan assembly, fan clutch, coolant temperature sensor, or other factors.
Troubleshooting Steps and Considerations
– Check the AC Functionality: It’s recommended to check if the radiator fans come on and stay on when the AC is turned on. If they don’t, it’s advised to check the 30A RDI FAN located in the fuse box by the battery and verify the presence of voltage (12 volts) between one of the fan’s wiring.
– Cooling System Diagnosis: In cases where the vehicle is overheating and only one fan is running, it’s suggested to refer to the COOLING section of the Service Manual for testing the fan motors with a multimeter. Additionally, it’s mentioned that cooling system diagnosis often involves spending money on one part only to find out that another part, such as the radiator or water pump, is actually the issue.
– Fuse and ECU Considerations: There is a possibility that a blown fuse to the ECU could be a factor in the radiator fan not running. It’s advisable to check the fuse for the ECU and consider diagnosing the issue beyond taking the car to the Lexus dealer.
– Routine Maintenance and Signs of Malfunction: Routine radiator maintenance is crucial for the longevity of the engine. Signs of radiator malfunction, such as overheating, low coolant, a damaged cooling fan, a faulty water pump, a malfunctioning thermostat, or a clogged radiator, should be monitored.
Importance of Radiator Fan Functionality
The cooling fan motor powers the cooling fan, which is responsible for preventing the engine from overheating. If a defective cooling/radiator fan motor is left unchecked, the car can overheat and become undriveable. The fan is located in the engine compartment, at the front or rear of the radiator, and it cools the coolant as it passes through the radiator.
In conclusion, troubleshooting the radiator fan not working on a Lexus LS430 involves checking various components such as the fan assembly, fan clutch, coolant temperature sensor, fuses, and conducting routine maintenance to ensure the proper functionality of the cooling system.

Why is my car AC fan not spinning?

There are usually three main causes of this: damaged cooling fans, an internal obstruction, or an electrical fault. If you suspect one of these problems to be the cause, book an appointment with a mechanic as soon as possible.

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 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.

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.

Will AC work without radiator fan?

The radiator fan draws air through the condenser, so if it is not functioning properly, you air conditioning will not work either. In that case, both you and your engine will overheat.

How do you test a radiator fan?

How to Test Radiator Fan with Car Battery

1. Find the cooling fan next to the radiator or use your car manual to locate it.
2. Unplug the connector.
3. Use jumper wires to power the motor directly by connecting it to the car battery.
4. If the motor spins it’s in good condition and the problem is either a blown fuse or bad relay.

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.

How do I know if my fan relay is bad?

If the cooling fan relay has failed, you may see warnings, such as the check engine light and the temperature warning light, pop up on the dash, but first, you may notice that the A/C stops cooling.

Can a bad thermostat cause radiator fan not to work?

An unlikely, but possible, cause is a bad thermostat. Try turning the Fan switch to the “On” position to see if the blower comes on.