Why is the radiator fan not working on my Lexus RX330?

The radiator fan not working on a Lexus RX330 could be due to several reasons. Here are a few possible causes:
1. Faulty fan motor: The fan motor may be defective and not functioning properly. If the motor is not receiving power or has burned out, it will not be able to spin and cool the radiator.
2. Blown fuse: There is a 30A RDI FAN fuse located in the fuse box by the battery. If this fuse is blown, it can prevent the radiator fan from working. Checking and replacing the fuse if necessary is a good first step in troubleshooting the issue.
3. Coolant temperature sensor: The coolant temperature sensor, located on the radiator, plays a role in activating the fan when the engine reaches a certain temperature. If the sensor is faulty, it may not send the signal to start the fan.
4. Fan relay: The fan relays, labeled FAN relay #1 and FAN relay #2, energize when the coolant temperature sensor opens. These relays are responsible for starting the fans. If the relays are not functioning correctly, the fans may not turn on.
To diagnose and troubleshoot the issue further, it is recommended to consult a mechanic or refer to the Lexus RX330 repair manual for specific instructions.
Please note that these are general suggestions, and it is always best to consult a professional for an accurate diagnosis and repair.

How do I know if my cooling fan module is bad?

A constant stream of warm air from the cabin vents is the strongest indicator of a failed cooling fan module. It causes the AC’s motors to fail. Hence, the supply of fresh cool air is hindered. Hot, stuffy air in the cabin is the last thing you want on a simmering, hot day.

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.

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.

What happens when you have a bad radiator fan sensor?

The faulty sensor might send a wrong signal to the computer, leading to a miscalculation in the engine timing and fuel calculation. If the computer keeps receiving a cold signal from the faulty sensor, it will interpret this as if the engine is cold and continue to inject more fuel.

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.

How do I know if my car 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.

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.

Where is the cooling fan relay on a 2004 Lexus rx330?

Hi, it is integrated into Junction Box #2 at left side of engine compartment, below/underside of relay box and fusible link box. If faulty, the whole junction box must be replaced.

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.