My Car Ac Blower Keeps Turning on And off? 5 Reasons

If your car’s AC blower keeps turning on and off, it may indicate a problem with the blower motor relay or a faulty blower motor resistor. This can lead to inconsistent heating or cooling in your vehicle.

Getting it checked by a professional mechanic is recommended to diagnose and fix the issue correctly, ensure optimal performance, and prevent further damage. Neglecting this problem can result in discomfort while driving and potentially expensive repairs in the future. Trusting a qualified technician with expertise in automotive AC systems will provide peace of mind and keep you cool on the road.

Loose Electrical Connections

Loose Electrical Connections

Damaged wiring or faulty electrical connections can be the root cause of your car AC blower turning on and off intermittently. Loose connections can result in the blower motor not receiving a consistent power supply, leading to the irregular operation of the AC system.

Symptoms of loose electrical connections:

  • AC blower randomly turning on and off
  • Intermittent airflow from the vents
  • Strange noises coming from the blower motor

How to diagnose loose electrical connections:

If you suspect loose electrical connections, here are a few steps to identify and fix the issue:

  1. Start by visually inspecting the wiring harness and connections for any visible damage or looseness.
  2. Use a multimeter to test the voltage at the blower motor and other electrical components.
  3. If the voltage readings are inconsistent or fluctuating, it indicates a loose connection.

Once you’ve identified the problem, secure and tighten any loose connections or consider replacing damaged wiring. This should resolve the issue and prevent the AC blower from turning on and off unexpectedly.

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Malfunctioning Blower Motor

A malfunctioning blower motor in your car’s AC can be a frustrating issue to deal with. It can cause your AC to turn on and off unexpectedly, making for an uncomfortable drive. There are a few signs that indicate a malfunction in the blower motor. Firstly, you may notice that the air coming out of your vents is not as strong as it used to be. Additionally, you might hear strange noises coming from the blower motor, such as squealing or grinding sounds.

There can be several causes for a malfunctioning blower motor. It could be due to a faulty relay, which is responsible for sending power to the motor. Another possibility is a worn-out blower motor resistor, which controls the fan speed. In some cases, a clogged air filter can also lead to issues with the blower motor.

If you are facing this problem, there are steps you can take to troubleshoot and fix it. Firstly, check the fuse that powers the blower motor to ensure it is not blown. Next, inspect the relay and replace it if necessary. You can also test the blower motor resistor with a multimeter to see if it is functioning correctly. Finally, clean or replace the air filter to ensure proper airflow. By following these steps, you can resolve the issue and enjoy a properly functioning AC system in your car.

Faulty Blower Motor Resistor

If your car AC blower keeps turning on and off, it could be due to a faulty blower motor resistor. The blower motor resistor plays a crucial role in controlling the speed of the blower motor. It regulates the amount of power supplied to the blower motor, allowing you to adjust the airflow in your car’s HVAC system.

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If the blower motor resistor is faulty, you may experience symptoms such as the blower motor not working at all, or it working only on certain speed settings. You may also notice the blower motor randomly turning on and off, regardless of the settings. In some cases, the blower motor may get stuck at the highest speed setting, resulting in excessive airflow.

To test and replace a faulty blower motor resistor, you can use a multimeter to check its resistance. If the resistance readings are outside the specified range, it is likely that the resistor needs to be replaced. Replacement typically involves removing the old resistor and installing a new one in its place.

Role of the blower motor resistor
Symptoms of a faulty blower motor resistor
How to test and replace a faulty blower motor resistor

Frequently Asked Questions

Why Does My Car Ac Fan Turn On And Off Randomly?

The car AC fan turning on and off randomly may indicate a problem with the fan relay or temperature sensor. It could also be due to a loose electrical connection or a faulty control module. It’s best to have a professional diagnose and fix the issue to ensure reliable cooling.

Why Does My Blower Motor Keep Cutting Out?

A blower motor may keep cutting out due to a faulty motor, overheating, or a problem with the electrical connections. Regular maintenance and checking for any issues can help prevent the motor from cutting out.

Why Does My Car Ac Blower Keep Turning On And Off?

The car AC blower may turn on and off due to a faulty blower motor resistor, a malfunctioning AC compressor, or low refrigerant levels. It is important to have your car inspected by a professional to determine the exact cause and get it fixed to avoid further damage to your AC system.

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Can A Dirty Cabin Air Filter Cause The Ac Blower To Turn On And Off?

Yes, a dirty cabin air filter can restrict airflow and put extra strain on the AC blower motor, causing it to turn on and off. Regularly replacing or cleaning the cabin air filter can prevent this issue and help maintain the proper functioning of your car’s AC system.


To sum up, dealing with a car AC blower that keeps turning on and off can be frustrating and uncomfortable, especially during hot summers. It’s crucial to address the issue promptly to avoid further damage to the system. Whether the problem lies with the blower motor, electrical connections, or an issue with the AC control module, seeking professional help is highly recommended.

Regular maintenance and timely repairs can ensure a smooth and efficient cooling experience in your car. Stay cool and enjoy the ride!

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