When Your AC Line is Frozen, This is What is Likely Happening

ac line is frozen

When Your AC Line is Frozen, This is What is Likely Happening

Perhaps you have noticed that your AC isn’t quite cooling your home the way it should. Temperatures are rising indoors and you go outside to check your unit and see if you can find the problem. Despite the summer temperatures, you notice that your AC line is frozen and covered in ice. So what gives? Find out more about what might be causing a frozen AC line and what you can do to fix your unit and bring your home back to a comfortable temperature.

Poor Airflow over the Evaporator Coil


  1. A dirty air filter. You should be changing your air filter on a monthly basis. If it becomes dirty and clogged, it will prevent air from flowing through the unit and allow the coils to freeze.

  2. Supply vents are closed. Some homeowners assume that closing supply vents in rooms that aren’t being used will put less stress on their unit and lower their utility bills. However, this practice can limit air flow and lead air conditioners to freeze.

  3. Return vents are blocked. Vents are also used to suck air into the unit and play an important role in proper air flow These can also become blocked and cause the unit to malfunction.

  4. Broken Fan or Blower. A broken fan won’t be able to send enough air over the evaporator coil. The fan is responsible for not only pulling warm air into the system, but also pushing cold air into the home through the ductwork and vents. When something goes wrong with the blower motor or fan, your system will stop working properly, it will become difficult to cool your home and your AC line could freeze.

  5. Dirty evaporator coil. Just as dirt can block the air filter and cause problems, a dirty evaporator coil will also prevent proper air flow. Regular maintenance will help you avoid this problem. 

When it comes to troubleshooting HVAC systems, your first step should always be to check and change the air filter. This simple task may be enough to fix the problem. From there, be sure to make sure all the vents are completely open and unobstructed.

For Fast & Affordable AC Repair

Low Refrigerant Levels

Low refrigerant levels are typically caused by a leak in the system and can also lead to freezing. This problem may also cause higher energy bills, hissing sounds and an air conditioner that is blowing warm air. A professional will be able to empty the remaining refrigerant, locate and repair the leak and restore your refrigerant levels to normal for optimal performance.


Thawing Your AC Line

DIYers are often looking for ways to thaw the AC unit and get the cool air flowing again. Simply turning off the thermostat and turning the fan to the “ON” position for a few hours will allow your unit to thaw out, but this won’t address the underlying problem and you may find that your lines quickly become frozen again. In addition, the thawing process can produce a lot of water. If this water isn’t properly directed and handled, it could end up causing serious water damage to your home. 

While it is tempting to try and fix your AC unit yourself there is a risk that you could trigger other problems and still be left with a hot home. Your best bet is to call a professional who can quickly assess your situation, recommend a course of action and make any necessary repairs. Paying an experienced technician now can help you avoid more costly repair and utility bills down the road.  

Schedule Your Air Conditioning Repair Today


If you suspect that you are experiencing any of the common AC problems above, please don’t hesitate to give us a call.  We can have a certified service technician at your home as quickly as possible to fix any issues behind your AC not cooling properly.  To set up your air conditioning repair today, call our office at (314) 209-7500 or fill out the online form below.

Licensed, Bonded, & Insured | St. Charles Mechanical License #M2770B | St. Louis County Mechanical License #X5296

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Bridgeton, MO 63044

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