Common Causes of AC Leaks

One of the most common issues that homeowners face is AC leaks. Not only can these leaks result in costly repairs, but they can also lead to reduced cooling efficiency and increased energy bills. In this blog post, we will explore the common causes of AC leaks and provide you with tangible tips to identify and prevent them. By taking these proactive measures, you can ensure that your AC system stays in optimal condition, keeping you cool and comfortable all summer long.

1. Clogged Condensate Drain Line

A clogged condensate drain line is one of the primary culprits behind AC leaks. Over time, dirt, debris, and algae can accumulate in the drain line, obstructing the flow of condensed water. This blockage leads to water backing up and leaking from your AC unit.


  • Regularly inspect and clean the condensate drain line to prevent clogs.
  • Use a mixture of vinegar and water to flush out any accumulated debris.
  • Consider installing a condensate drain line overflow switch to automatically shut off your AC unit if a clog occurs.

2. Damaged or Blocked Drain Pan

The drain pan, located beneath the evaporator coil, collects the condensed water and safely drains it away. However, if the drain pan becomes damaged or blocked, it can cause water to overflow and leak from your AC system.


  • Regularly inspect the drain pan for cracks or signs of damage.
  • Ensure that the drain pan is properly aligned and not blocked by debris.
  • If you notice any issues, contact a professional HVAC technician to repair or replace the drain pan.

3. Frozen Evaporator Coil

When the evaporator coil becomes excessively cold, it can freeze the condensate on its surface. As the ice melts, it can overwhelm the drain pan, leading to AC leaks.


  • Regularly inspect the evaporator coil for ice buildup.
  • Ensure proper airflow by regularly replacing air filters.
  • If you notice ice formation, turn off your AC and allow the coil to thaw. Contact a professional if the issue persists.

By understanding the common causes of AC leaks and implementing the preventive measures outlined above, you can save yourself from the hassle and expense of dealing with a malfunctioning AC system. Remember to regularly inspect and maintain your AC unit to ensure its longevity and efficiency.

At 1st Priority Heating & Cooling and Construction, we specialize in providing top-notch HVAC services in Kansas City. Our team of experienced technicians can diagnose and repair any AC leaks, ensuring that your system operates flawlessly. Contact us today to schedule a maintenance appointment and keep your home cool throughout the summer!