Why is my system freezing up?

If your AC system is freezing up—literally forming ice on the coils or lines—you’re not alone. This is a common HVAC issue that can quickly compromise performance and comfort.

While some quick checks may help in the short term, most causes of system freezing require professional service. Let’s walk through what to look for, how to troubleshoot safely, and when to call Jacobs and Rhodes to prevent long-term damage.

First Step: Check Your Air Filter

A dirty or clogged air filter is one of the most common reasons an AC unit starts to freeze. When airflow is restricted, cold air gets trapped inside the system, causing coils to ice over.

✅ What to Do:

  • Turn off the system

  • Replace or clean the air filter

  • Switch the system to “Fan” mode to help thaw the ice

Have a heat pump? You can also turn the system to “Heat” mode briefly to speed up the thawing process—just don’t forget to switch it back.

If the system freezes again, the problem runs deeper.

Low Refrigerant = Big Red Flag

Low refrigerant is a frequent culprit behind frozen AC units—and it’s not something you can fix on your own. It usually means there’s a leak in the system.

Common leak causes:

  • Weak or failing solder joints

  • Vibration damage from contact with other surfaces

  • Loose fittings or open service valves

If you suspect a refrigerant issue, turn off the system and call Jacobs and Rhodes right away. Depending on the age of your unit and the location of the leak, we’ll help you determine if a repair or full replacement makes more financial sense.

Dirty Evaporator Coil? You Might Not Notice—Until It Freezes

Over time, your evaporator coil collects dust, grime, and other debris. This slowly reduces airflow and efficiency, often without any immediate symptoms—until suddenly, the unit freezes or cooling drops significantly.

✅ What to Watch For:

  • Reduced airflow from vents

  • Uneven cooling

  • Ice buildup around the indoor unit

This is a job for the pros. Coil cleaning requires specialized tools and safe handling of refrigerant components. We’ve got your back.

Blower Motor or Relay Failure

If your blower motor isn’t functioning properly—or is running intermittently—your system can freeze due to inadequate airflow. A failing relay or a motor that overheats and slows down may cause airflow to stop entirely.

Signs your blower motor or relay may be the issue:

  • AC kicks on but air isn’t blowing

  • Motor runs inconsistently or cuts off mid-cycle

  • You hear clicks but feel no air

These are all clear indicators to bring in an HVAC professional. At Jacobs and Rhodes, we’ll inspect your electrical components, replace faulty parts, and get your system running reliably again.

Don’t Ignore a Freezing AC—It Only Gets Worse

Ice buildup isn’t just inconvenient—it’s a symptom of a larger problem that can damage your compressor, reduce energy efficiency, and shorten your system’s lifespan.

If your AC is freezing up:

  • ✅ Start with a clean air filter and fan-only thaw

  • 🚫 Don’t keep running it while frozen

  • 📞 Call Jacobs and Rhodes to inspect and repair the root cause

Need Help Fast? We’re On It.

Our team at Jacobs and Rhodes specializes in diagnosing and fixing AC issues fast—before they turn into costly breakdowns.

📞 Call us today for service, or schedule online for a prompt inspection.

We’ll get your system back on track and keep your home cool, safe, and efficient—no matter how hot it gets outside.