Radiator Fan Not Working When AC Is On: Causes and Fixes

If your radiator fan isn’t working when the AC is on, there could be a few different causes. In this blog post, we’ll explore some of the most common causes, as well as a few potential fixes. By troubleshooting the issue and identifying the root cause, you can get your AC up and running again in no time.

What Causes the radiator fan not to work when ac is on?

There are a few potential causes for a radiator fan not to work when the AC is on. One possibility is that the fan switch is not working correctly. Another possibility is that there is an issue with the fan motor itself. Finally, it is also possible that there is a problem with the AC system itself.

A blown fuse

A blown fuse is one of the most common reasons why a radiator fan may not work when the AC is on. The fuse protects the circuit from overheating and overloading, and if it blows, the fan will not be able to operate. Replacing the fuse is a simple and inexpensive fix that can be done at home.

Bad temperature coolant sensor

A broken temperature sensor is one of the most common reasons why your radiator fan may not be working when the AC is on. The sensor is responsible for telling the fan when to turn on and off, and if it is broken, the fan will not turn on even when the AC is on.

There are a few ways to tell if your temperature sensor is broken. One way is to check the engine light. If the engine light is on, it could be a sign that the sensor is not working properly. Another way to tell is to feel the radiator hose. If the hose is hot, but the radiator itself is not, it could be a sign that the sensor is not working properly.

If you suspect that your temperature sensor is broken, you should take your car to a mechanic to have it checked out.

No or low coolant

If your radiator fan isn’t working when the AC is on, it could be because the coolant level is low. Check the coolant level in the radiator and add more if necessary. If the coolant level is fine, then the problem could be a faulty fan motor or a problem with the AC itself. If the fan motor is faulty, it will need to be replaced. If the problem is with the AC, then it will need to be repaired by a professional.

Blown relay

If your radiator fan is not working when the AC is on, it is likely due to a blown relay. The relay is responsible for supplying power to the fan, and if it is blown, the fan will not receive power and will not be able to turn on. In order to fix this, you will need to replace the relay with a new one. You can find replacement relays at most auto parts stores.

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The bad fan controller module

A bad fan controller module can cause your radiator fan to not work when your AC is on. There are a few ways to test for a bad controller module. One way is to check for power at the fan connector. Another way is to check for continuity between the ground and power wires. If there is no power or continuity, then the controller module is most likely bad.

Broken radiator fan

A broken radiator fan can cause your car’s engine to overheat. The fan helps to keep the engine cool by circulating air through the radiator. If the fan is not working, the engine will overheat and may eventually seize up. There are a few things that can cause a radiator fan to stop working.

The first thing to check is the fuse. The fuse may be blown if the fan is not working. If the fuse is blown, replace it with a new one.

The next thing to check is the fan motor. The fan motor may be burned out if the fan is not working. If the fan motor is burned out, replace it with a new one.

The last thing to check is the fan shroud. The fan shroud may be broken if the fan is not working. If the fan shroud is broken, replace it with a new one.

Bad wiring connections

Bad wiring connections are a common cause of radiator fan not working when AC is on. Check all the wiring connections to make sure they are tight and free of any corrosion. If any of the connections are loose or corroded, they will need to be cleaned or replaced.

Bad AC high-pressure sensor

There are a few reasons why your AC’s high-pressure sensor might not be working properly. One possibility is that there’s a problem with the wiring. Another possibility is that the sensor itself is faulty.

If the wiring is the issue, it’s important to have it fixed as soon as possible. Otherwise, the sensor won’t be able to send the correct signal to the AC’s control unit. This can lead to the AC not working properly, or not working at all.

If the sensor itself is the issue, it will need to be replaced. This is a relatively simple process, but it’s important to make sure that the new sensor is compatible with your AC. Otherwise, it might not work properly.

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Check the coolant level and the temp sensor

If your radiator fan is not working when the AC is on, one of the first things you should check is the coolant level and the temp sensor. If the coolant level is low, it could be the cause of the problem. The temp sensor is responsible for telling the fan when to turn on and off. If the temp sensor is not working properly, it could cause the fan to not turn on when it should.

Check the wiring and the fan controller module

The radiator fan is an important component of the cooling system, and if it is not working properly, the engine can overheat. There are a few things that can cause the radiator fan to not work when the AC is on. One is a problem with the wiring. Another is a problem with the fan controller module.

If the wiring is damaged or has a loose connection, the fan will not be able to operate properly. The fan controller module may also be damaged or have a faulty connection. These are the two most common causes of the radiator fan not working when the AC is on.

If you suspect that the wiring is the problem, you should check the wires leading to the fan for any damage. If you find any damage, you should replace the wires. If you suspect that the fan controller module is the problem, you should replace it.

FAQs:

1. Why isn’t my radiator fan working when my AC is on?

There are several potential reasons why your radiator fan might not be working when your AC is on. One possibility is that the fan itself is defective and needs to be replaced. Another possibility is that there is a problem with the electrical connection to the fan, or with the fan relay. Finally, it is also possible that there is a problem with the AC itself, which is preventing the fan from being turned on.

2. How can I troubleshoot my radiator fan issue?

If your radiator fan is not working when your AC is on, the first thing you should do is check the fuse for the fan. If the fuse is blown, replace it and see if that fixes the problem. If the fuse is not the issue, then you will need to check the electrical connection to the fan, as well as the fan relay. If those are both working properly, then the problem is likely with the AC itself.

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3. How can I fix my radiator fan issue?

If your radiator fan is not working when your AC is on, the first thing you should do is check the fuse for the fan. If the fuse is blown, replace it and see if that fixes the problem. If the fuse is not the issue, then you will need to check the electrical connection to the fan, as well as the fan relay. If those are both working properly, then the problem is likely with the AC itself.

Radiator Fan Not Working When AC Is On: Causes and Fixes

Must Read

1. Check the fuse: The first thing you’ll want to do if your AC fan isn’t working is to check the fuse. If the fuse is blown, it will need to be replaced.

2. Check the thermostat: Another possible cause of your AC fan not working could be a faulty thermostat. If the thermostat is not working properly, it may not be sending the signal to turn on the fan.

3. Check the wiring: If the fuse and thermostat are both working properly, the next thing you’ll want to check is the wiring. If the wiring is faulty, it could be preventing the fan from getting the power it needs to operate.

4. Clean the fan: If the fan is dirty, it may not be able to function properly. Use a brush or compressed air to clean the fan blades and make sure there is no debris blocking the airflow.

5. Check the capacitor: The capacitor is responsible for starting the fan. If the capacitor is damaged, the fan may not start. You’ll need to replace the capacitor if it is damaged.

6. Check for leaks: Another possible reason your AC fan isn’t working could be because of leaks in the system. If there are leaks, the refrigerant can escape and the system will not work properly.

Conclusion

Thanks for reading! We hope this article was helpful in diagnosing and fixing your radiator fan issue. If you have any further questions or concerns, feel free to reach out to us in the comments below or through our contact page.

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