Why Is My AC Unit Leaking Water?
A leaking AC unit is one of the most common HVAC problems homeowners face. Here's what causes it and how to fix it fast.
Quick Answer
Your AC unit is likely leaking water due to a clogged condensate drain line, frozen evaporator coil, broken condensate pump, or low refrigerant. While some issues can be DIY-fixed, most require professional repair to prevent water damage and system failure.
Average repair time: 1-2 hours | Typical cost: $150-$400
5 Common Causes of AC Water Leaks
Clogged Condensate Drain Line
Most common cause (80% of cases). Your AC removes humidity from the air, creating condensation that drains through a PVC pipe. Algae, mold, and debris can clog this line, causing water to back up and leak from your indoor unit.
DIY Fix: Pour 1 cup of white vinegar down the drain line monthly to prevent buildup.
Frozen Evaporator Coil
When your evaporator coil freezes (due to low refrigerant, dirty filters, or restricted airflow), it eventually melts and creates excess water that overwhelms the drain pan.
Warning signs: Ice on refrigerant lines, reduced cooling, hissing sounds.
Broken Condensate Pump
If your indoor unit is in a basement or attic, it uses a condensate pump to push water outside. When the pump fails, water backs up and leaks.
DIY Check: Listen for the pump motor running when AC is on. No sound = broken pump.
Cracked or Overflowing Drain Pan
The drain pan under your indoor unit catches condensation. After 12-15 years, rust and corrosion can create cracks. An overflowing pan indicates a drainage problem.
Temporary fix: Place towels under leak and call for repair immediately.
Dirty Air Filter
A clogged air filter restricts airflow over the evaporator coil, causing it to freeze and then leak when it melts.
DIY Fix: Replace your air filter every 30-90 days. This prevents 40% of AC problems.
What to Do Right Now (Step-by-Step)
- 1
Turn Off Your AC
Prevent further water damage by turning off your system at the thermostat.
- 2
Clean Up Standing Water
Use towels and a wet/dry vacuum to remove water quickly to prevent mold growth.
- 3
Check Your Air Filter
If it's dirty, replace it. This could be your entire problem.
- 4
Inspect the Drain Pan
Look for cracks, rust, or overflow. Located under your indoor unit.
- 5
Call a Professional
If the problem persists after checking the filter and drain pan, you need professional repair.
When to Call for Emergency Service
Contact us immediately if you notice:
- •Heavy leaking that could damage flooring, walls, or ceilings
- •Ice on refrigerant lines or visible frost on the indoor unit
- •Complete loss of cooling during extreme Arkansas heat
- •Musty odors or mold developing around the unit
Need Help Right Now?
We offer same-day emergency AC repair throughout Arkansas. Our veteran-owned team will diagnose and fix your leak fast—often within hours.
Available 24/7 • Same-Day Service • Veteran-Owned • American Standard Authorized Dealer
Why Arkansas Homeowners Choose Jet Heat & Air
Same-Day Service
Most leaks fixed within 24 hours
Authorized Dealer
American Standard & Samsung certified
Expert Technicians
Veteran-owned, locally trusted