What should I do if my AC is blowing warm air intermittently?

If your AC is blowing warm air intermittently, check airflow and controls first, then schedule a professional diagnostic if it returns. The most common causes are airflow problems or a freezing coil from low refrigerant or a clogged filter, which often come and go before fully failing. Intermittent heat from the vents can also point to a weak capacitor or a thermostat issue that needs testing. We service homes across the Fort Wayne area and arrive with fully stocked trucks to diagnose and fix most problems in a single visit.

Try these quick checks before you call:

• Set the thermostat to Cool with the fan on Auto and lower the setpoint.
• Replace the air filter, open all supply vents, and clear return grilles.
• Clear leaves and debris from the outdoor unit and ensure good airflow.
• If you see ice on the lines or coil, turn the system off to thaw and run the fan.

If you notice electrical buzzing, water around the furnace, or rapid short-cycling, turn the system off and book service. <br/> Updated: 2026-02-11 <br/> Need help in Leo, IN? Call (277) 267 0744 or book online. "He was able to repair the unit, then performed the routine servicing." — Robert L.