By 
Nothing feels better than cool air on a hot day—until your AC suddenly stops working, and you find out the indoor coil is frozen solid. If you’ve noticed weak airflow, warm air blowing from the vents, or even ice forming on your unit, don’t panic! Let’s go over why this happens and what you can do about it.
Why Does an AC Coil Freeze?
Your indoor AC coil, also known as the evaporator coil, absorbs heat from the air in your home. When it gets too cold, moisture in the air condenses and freezes on the coil. Several issues can cause this:
- Restricted airflow – Dirty air filters, blocked vents, or ductwork problems can limit airflow, causing the coil to get too cold.
- Low refrigerant levels – A refrigerant leak can lower pressure in the system, leading to freezing.
- Dirty evaporator coil – Dirt and dust buildup can prevent heat absorption, making the coil too cold.
- Faulty blower fan – If the fan isn’t working correctly, it won’t circulate enough air over the coil.
What You Can Do to Fix It
If you discover a frozen coil, follow these steps to fix the issue and prevent future problems.
1. Turn Off Your AC
First things first—turn off your air conditioner. Running the system while the coil is frozen can cause further damage. Switch it off and let the ice melt completely before taking any further steps.
2. Check and Replace the Air Filter
A clogged air filter is one of the most common causes of coil freezing. If it’s dirty, replace it with a clean one. Ideally, you should check and change your filter every 1–3 months.
3. Inspect the Vents and Registers
Blocked vents can restrict airflow, so make sure all supply and return vents are open and unobstructed by furniture, curtains, or rugs.
4. Clean the Evaporator Coil
If the AC coil is covered in dirt and dust, it can’t absorb heat efficiently. Once the ice has melted, gently clean the coil using a soft brush or a coil cleaner spray.
5. Check for Refrigerant Leaks
If your system has a refrigerant leak, you’ll likely need a professional to diagnose and fix the issue. Low refrigerant levels require expert handling to avoid further damage.
6. Ensure the Blower Fan is Working
A malfunctioning blower fan can cause airflow issues. If you notice weak airflow even after replacing the filter, you may need a technician to inspect the fan motor.
When to Call a Professional
If your AC keeps freezing up despite following these steps, it’s time to call in an expert. Persistent freezing can indicate deeper problems like refrigerant leaks, duct issues, or electrical malfunctions. A trained technician can perform a full system check and ensure your AC runs smoothly.
Comments