Not working car air conditioning fan: from causes to solutions

The exhausting heat of summer and the lack of a pleasant air conditioner in the car can turn driving into an unpleasant experience. One of the common problems you may encounter in this situation is the car air conditioning fan not working. The air conditioning fan plays an important role in cooling the ventilation system, and its failure can completely disrupt the air conditioner's performance. In this article from the series of general car repair articles, we will examine the various reasons for the car air conditioning fan not working and solutions to fix this problem.

How the car air conditioning fan works

Before examining the reasons for the car air conditioning fan not working, it is worth taking a brief look at how the air conditioning fan operates. The car's air conditioning system works based on a refrigeration cycle that includes main components such as the compressor, condenser, expansion valve, and evaporator. The refrigerant gas circulates in this cycle and cools the interior of the car by absorbing heat from the environment. The air conditioning fan is responsible for expelling the warm air around the condenser, thus helping to cool the refrigerant gas.

Reasons for the car air conditioning fan not working and its symptoms

Various reasons can cause the air conditioning fan to stop working. Some of the most important reasons include:

1. Fuse failure:

Cause: The fuse is a safety component that protects the electrical circuit from excessive current. If the electric current becomes excessive due to reasons such as a short circuit or overload, the fuse blows and cuts off the circuit to prevent damage to other components.

Symptoms: Usually, no other symptoms are observed other than the fan not working.

2. Relay failure:

Cause: The relay is an electromechanical switch that controls the flow of electricity to the fan. If the relay fails, the command to turn on the fan is not transmitted to the motor.

Symptoms: Usually, no other symptoms are observed other than the fan not working.

3. Problem with the fan motor:

Cause: The fan motor may fail for various reasons, including burned windings, stuck bearings, or damaged blades.

Symptoms: An unusual sound may be heard from the fan motor, or the motor may show no response at all.

Solution: Replace the fan motor.

4. Wiring problems:

Cause: Broken, shorted, or oxidized wires connecting to the fan motor can disrupt the flow of electricity and stop the fan from working.

Symptoms: In some cases, a clicking sound from the relay may be heard when the air conditioning switch is turned on, but the fan does not operate.

5. Refrigerant gas leak:

Cause: A decrease in refrigerant gas in the air conditioning system can lead to reduced pressure and, consequently, stop the fan from working. Some systems are designed to turn off the fan to protect the compressor if the refrigerant gas pressure decreases.

Symptoms: In addition to the fan not working, the air conditioner may not produce enough cold air or may not produce cold air at all.

6. Dirty condenser and fan:

Cause: Accumulation of dust and dirt on the condenser and fan can obstruct airflow and reduce system efficiency, even stopping the fan from working.

Symptoms: The air conditioner may produce warm or lukewarm air.

7. Sensor problems:

Cause: Temperature and pressure sensors are responsible for controlling the operation of the air conditioning system. Failure of any of these sensors can disrupt the fan's operation.

Symptoms: The air conditioner may turn on or off unexpectedly, or the output air temperature may fluctuate.

Learn more: Repairing various spark plugs and wires of cars, prices, fees, and complete repair costs

8. Control module problems:

Cause: The control module is the brain of the air conditioning system. Failure of this component can disrupt the operation of all system components, including the fan.

Symptoms: None of the air conditioning system functions may work properly.

Car air conditioning fan not working

Fixing the problem of the car air conditioning fan not working

To fix the problem of the car air conditioning fan not working, you first need to identify the exact cause of the failure. For this, you can seek help from a skilled mechanic or take the following steps yourself:

Check the fuse: Inspect the fuse and replace it with a similar amperage fuse if it is blown.

Check the relay: Remove the relay from the circuit and test it with a multimeter. If it is faulty, replace the relay.

Check the fan motor: Inspect the fan motor for burning, sticking, or damage to the blades. If necessary, replace the motor.

Check the wiring: Carefully inspect the wires connecting to the fan and repair or replace them if any issues are found.

Check for refrigerant gas leaks: Inspect the air conditioning system for refrigerant gas leaks and address any leaks found.

Clean the condenser and fan: Thoroughly clean the condenser and fan to prevent airflow blockage.

Check the sensors and control module: If necessary, have the sensors and control module inspected and repaired or replaced by a skilled mechanic.

Buy various types of manual and pneumatic rivet nut tools with a guarantee of authenticity

Preventing air conditioning fan failure

To prevent air conditioning fan failure and extend the lifespan of the air conditioning system, you can take the following actions:

Periodic servicing: Service the air conditioning system at least once a year.

Keep the car clean: Prevent dust and dirt from entering the car.

Use the air conditioner properly: Avoid turning on the air conditioner at very low temperatures.

Pay attention to early signs of failure: If you notice any unusual signs, visit a repair shop promptly.

Be sure to read: When is the best time to replace car filters?

Important tips

Periodic servicing: Don’t forget to periodically service the air conditioning system to prevent problems.

Use original parts: Use original and high-quality parts for air conditioning repairs.

Consult a skilled mechanic: If you are unable to resolve the issue, consult a skilled mechanic.

Car air conditioning fan not working

The car air conditioning fan not working can have various causes, and accurately diagnosing the cause and fixing it requires technical knowledge and the right tools. Given the importance of the air conditioning system in the car, it is recommended to promptly address any issues with this system.

What are the reasons for the car's cooler fan not working and how can the problem be solved?

Why are transparent plastic containers better for the freezer?

Backhoe Loader WZ30-25

Dressing children's clothes for different styles

Tehran International Exhibition, the 18th Iran Plast Exhibition 2024