3 Simple Steps for Repairing a Frozen Air Conditioner

Does the air flowing from your supply registers abruptly appear not cold enough? Look at the indoor part of your air conditioner. This component is located in your furnace or air handler, if you have a heat pump. If there’s water dripping onto the floor, there might be ice on the evaporator coil. The AC coil in the unit could have frozen. You’ll need to defrost it before it can cool your house again.

Here’s what to do. If you can’t get the coil frost-free, Aramendia Plumbing, Heating and Air is here to support you with air conditioning repair in San Antonio that includes a a 100% satisfaction guarantee.*

Step 1: Turn the Air Conditioning Off and the Blower On

To begin—switch the thermostat from “cool” to “off.” This halts cold refrigerant from flowing to the outdoor compressor, which could damage it and cause an expensive repair.

Next, adjust the fan from “auto” to “on.” This produces warm airflow over the frozen coils to make them melt faster. Double check to set the cooling mode to “off” so the air conditioner doesn’t begin a cooling cycle.

It might take less than an hour or most of the day for the ice to thaw, depending on the degree of the accumulation. While you’re waiting, watch the condensate pan below the AC unit. If the drain line is obstructed, it can spill over as the ice melts, likely resulting in water damage.

Step 2: Diagnose the Issue

Bad airflow is a chief cause for an AC to become frozen. Here’s how to troubleshoot the problem:

  • Inspect the filter. Inadequate airflow through a dusty filter could be the issue. Check and change the filter monthly or once you notice dust buildup.
  • Open any closed supply vents. Your house’s supply registers should remain open always. Closing vents decreases airflow over the evaporator coil, which can lead it to freeze.
  • Look for blocked return vents. These typically don’t use adjustable louvers, but furniture, rugs or curtains can still obstruct them.
  • Insufficient refrigerant: While airflow restrictions are the most common cause, your air conditioner could also be low on refrigerant. Depending on its age, it may have Freon® or Puron®. Low refrigerant requires pro assistance from a certified HVAC technician. H2: Step 3: Call an HVAC Pro at Aramendia Plumbing, Heating and Air

If low airflow doesn’t appear to be the issue, then another issue is making your AC freeze. If this is the case, just letting it melt won’t take care of the trouble. The evaporator coil will possibly continually freeze unless you fix the root symptom. Contact an HVAC pro to check for issues with your air conditioner, which could include:

  • Refrigerant leak: AC units continuously use refrigerant, so it shouldn’t run low. Not enough refrigerant signals a leak somewhere. Only a professional can find the leak, fix it, and recharge the system to the appropriate level.
  • Dirty evaporator coil: If dirt collects on the coil, air can’t reach it, and it’s apt to freeze.
  • Nonfunctional blower: A broken motor or unbalanced fan can halt airflow over the evaporator coil.

The next time your AC freezes up, contact the NATE-certified Experts at Aramendia Plumbing, Heating and Air to repair the problem. We have lots of experience helping homeowners troubleshoot their air conditioners, and we’re sure we can get things working again quickly. Contact us at 210-404-4233 to book air conditioning repair in San Antonio with us right away.


*Not applicable to the Advantage Program. See your signed Advantage Program agreement for full details and exclusions. 100% Satisfaction Guarantee is subject to certain restrictions and limitations as set forth in the applicable Terms and Conditions.

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