Why is the radiator fan not working on my Acura Legend?

The radiator fan in your Acura Legend may not be working due to several possible reasons. Here are some factors to consider:
Faulty Fan Control Unit:
The Fan Control Unit, located under the carpet next to the ECU on the passenger side, controls the operation of both the radiator fan and the condenser fan. It uses input signals from the coolant temperature sensor and AC pressure switch to determine when the fans should run and at what speed. If the Fan Control Unit is faulty, it may cause the radiator fan to not work properly.
Bad Radiator Fan Relay:
The radiator fan relay, located in the relay box attached to the radiator, is responsible for sending power to the radiator fan. If the relay is faulty, it can prevent the fan from turning on.
Stuck Thermostat or Air in Cooling System:
A stuck thermostat or excessive air in the cooling system can cause the thermostat to close and prevent the fans from running.
Defective Radiator Fan Motor:
If the radiator fan motor is defective, it may not be able to spin and cool the radiator effectively.
Other Possible Causes:
There may be other potential causes for the radiator fan not working, such as a faulty fan timer or a problem with the fan assembly or fan clutch . It is recommended to have a professional mechanic diagnose the issue to determine the exact cause and provide a solution.
Please note that these are general possibilities, and it is always best to consult with a qualified mechanic or refer to the Acura Legend Forum for specific advice and troubleshooting steps.
I hope this helps! Let me know if you have any other questions.

Will AC work without radiator fan?

The same way your radiator needs airflow to cool the coolant, your condenser needs airflow to cool the freon that makes cold air. That fan is where the air flow is coming from, until you get up to speed. A broken fan may not seem like much, but it can cause overheating and of course your ac not to work at lower speeds.

Can a bad thermostat cause fan not to come on?

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. Watch the video. If the blower operates in the “On” position and does not operate when the air conditioner is running, you may have a bad thermostat.

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.

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.

What would cause a radiator fan to stop working?

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.

Can I drive with radiator fan off?

If you’re moving, air will flow over the radiator and cool it down. However, when you come to a stop, or get stuck in stop and go traffic, you’re going to overheat. If you have to drive the car without the fans, make sure to turn your heater on to full blast.

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 sensor triggers 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. If it’s not working, the fan won’t turn on when it needs to, which means the engine might overheat.

Can I drive car without cooling fan?

Fans are usually only necessary when not moving. While driving, the air moving through the radiator will provide all the cooling you need. If you only stop for short periods, or one fan happens to do the job, you might be ok.

Is the radiator fan always supposed to be running?

In normal operation, no, the radiator fan doesn’t run all the time. The fan is hooked to a sensor that measures the coolant temperature in the radiator, and when the temperature gets a little on the high side, the sensor will (basically) send a signal that turns the fan on.