Why Split AC Not Cooling but Fan is Running

If your split AC is not cooling but the fan is running, frustration might set in.

Don’t fret! We’ve prepared a comprehensive troubleshooting guide to help you diagnose and potentially fix the issue.

Follow these steps carefully to restore your split AC’s cooling efficiency.

Why is My Split AC Fan Working but Not Cooling?

1. Check the Thermostat Settings

Ensure that the thermostat is set to the desired cooling temperature. Sometimes, a simple adjustment can make a significant difference.

2. Inspect Air Filter

A clogged or dirty air filter can hinder airflow and compromise cooling. Remove and clean the filter if needed, or replace it according to the manufacturer’s recommendations.

3. Examine the Condenser Coils

Dust and debris on the condenser coils can reduce their efficiency. Gently clean the coils using a soft brush or vacuum cleaner. Ensure the power is off before attempting any cleaning.

4. Verify Refrigerant Levels

Low refrigerant levels can impede the cooling process. Consult a professional technician to check and recharge the refrigerant if necessary. Refrigerant handling requires expertise and is best left to the pros.

5. Check for Refrigerant Leaks

Inspect the refrigerant lines for any visible leaks. If you notice oil stains or refrigerant puddles, contact a qualified technician immediately.

6. Inspect the Condensate Drain

A clogged condensate drain can cause water buildup and affect cooling. Clean the drain line using a mixture of bleach and water or contact a professional for assistance.

7. Ensure Proper Insulation

Check the insulation on the refrigerant lines. Damaged or inadequate insulation can lead to cooling inefficiencies. Replace or repair insulation as needed.

8. Examine the Evaporator Coils

Dirty or frozen evaporator coils can impact cooling. If you notice ice buildup, allow the coils to thaw and clean them gently. If the issue persists, consult a professional technician.

9. Evaluate the Capacitor

A faulty capacitor can affect the compressor’s ability to cool. Consult your unit’s manual or a technician to test and replace the capacitor if needed.

10. Test the Thermostat Sensor

Ensure the thermostat sensor is properly positioned near the evaporator coils. Adjust its placement if necessary, following the manufacturer’s guidelines.


If you’ve gone through these troubleshooting steps and the issue persists, it’s advisable to seek professional assistance.

Attempting complex repairs without the necessary expertise may cause further damage.

Remember, regular maintenance can prevent many of these issues, so schedule routine check-ups to keep your split AC running smoothly. Stay cool!