Resolving the Issue of a Split AC Not Cooling but Fan Running

Split AC

A split air conditioner that runs its fan but doesn’t cool the air can be frustrating, especially during sweltering heat. Understanding the potential causes and solutions is essential for restoring your AC’s functionality. This article outlines common reasons behind this issue and provides clear steps to troubleshoot of split ac not cooling but fan is running and resolve it effectively.

Understanding the Problem: Common Causes

Low Refrigerant Levels

Refrigerant is crucial for the cooling process in your AC. If the refrigerant level is low due to a leak or improper charging, the system won’t be able to cool the air efficiently. This typically requires professional intervention to diagnose and rectify.

Dirty Air Filters

Air filters trap dust and debris, ensuring clean air circulation. However, when they become clogged, airflow is restricted, leading to inadequate cooling. Regular maintenance is necessary to prevent this problem.

Blocked or Dirty Condenser Unit

The outdoor condenser unit plays a vital role in the cooling process. If it’s obstructed by debris like leaves or dirt, it can’t release heat effectively, which hampers cooling.

Faulty Thermostat

A malfunctioning thermostat can fail to signal the AC to cool properly, leading to issues with temperature regulation. Checking and, if necessary, replacing the thermostat can resolve this problem.

Frozen Evaporator Coils

Evaporator coils can freeze due to low refrigerant, poor airflow, or other malfunctions. When these coils are frozen, the AC unit cannot cool the air effectively.

Electrical Issues

Problems with electrical components, such as capacitors, relays, or wiring, can disrupt the cooling process. Even if the fan runs, these issues can prevent the system from cooling.

Troubleshooting and Fixes

Inspect and Clean Air Filters

Start with the simplest solution: check your air filters. Clean or replace them if they are dirty or clogged. Clean filters ensure optimal airflow and improve cooling efficiency.

Check Thermostat Settings

Ensure the thermostat is set to the desired temperature and mode (cooling mode). Replace the batteries if necessary and make sure it’s functioning correctly. An operational thermostat is critical for proper cooling.

Clear the Condenser Unit

Inspect the outdoor condenser unit and remove any debris or obstructions. Cleaning the condenser coils can also enhance efficiency. A clear and clean condenser unit is crucial for effective cooling.

Thaw Frozen Evaporator Coils

If the evaporator coils are frozen, turn off the AC unit to allow the coils to thaw. This process can take several hours. Once thawed, identify and address the underlying cause, such as airflow restrictions or low refrigerant levels.

Check and Refill Refrigerant

Low refrigerant levels should be handled by a professional technician. They can check for leaks, refill the refrigerant, and ensure the system is operating correctly.

Examine Electrical Components

Electrical issues require professional attention. If you suspect a problem with the electrical components, contact a qualified technician to inspect and repair the system safely.

When to Call a Professional

Persistent Cooling Issues

If troubleshooting steps do not resolve the issue, it’s time to call a professional. Persistent problems might indicate complex issues requiring expert diagnosis and repair.

Refrigerant Leaks

Handling refrigerant requires specialized skills and equipment. If you suspect a refrigerant leak, it’s essential to have a licensed HVAC technician address it safely.

Electrical Repairs

Electrical repairs can be dangerous without proper training. A professional technician can safely diagnose and fix electrical issues, ensuring your AC operates safely and efficiently.

Preventive Maintenance Tips

Regular Filter Maintenance

Clean or replace air filters every 1-3 months, depending on usage, to ensure optimal airflow and cooling efficiency.

Annual Inspections

Schedule annual inspections and servicing by a professional to identify and fix potential issues before they become major problems.

Keep the Condenser Clear

Regularly inspect the outdoor condenser unit and remove any debris. A clean and unobstructed condenser unit is crucial for efficient cooling.

Monitor Thermostat

Regularly check the thermostat settings and functionality. Consider upgrading to a programmable thermostat for better temperature control and energy efficiency.


A split AC that runs its fan but doesn’t cool can often be fixed by addressing common issues like dirty filters, blocked condenser units, or faulty thermostats. Regular maintenance and timely professional assistance for complex problems like refrigerant leaks or electrical issues can ensure your AC runs efficiently. Keeping your system well-maintained will help you stay cool and comfortable during the hottest months.

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