How to Clear a Clogged AC Drain Line

May 16, 2022
AC freezing up in Centerville, UT

The AC drip pan is full. The attic smells moldy and seems overly humid. These clues are common signs of AC condensate line problems. Let’s take a look at why it happens and how to clear a clog in your AC drain line.

Why Do AC Drain Lines Clog?

When your air conditioner operates properly, its evaporator coil absorbs heat and humidity from the air. The resulting moisture collects in the AC drain pan and empties outside through the condensate line.

Over time, dirt and mold accumulate inside the drain line. Mineral buildup from hard water can add to the problem. Eventually, the line clogs, water backs up in the drain pan, and you’re facing a soggy mess.

How Do You Clear a Clogged AC Drain Line?

A clogged condensate line needs to be cleared right away. Otherwise, you run the risk of water flooding the attic, soaking ceilings, and ruining drywall. Follow these three steps to unclog the AC drain line.

1. Stay safe and prep. Turn off power to the AC unit at your home’s breaker box. Remove the drain cap at the top of the line, and then look inside for visible clogs. Pull out any blockage, being careful not to push it further into the line.

2. Pour and wait. Pour a quarter cup of vinegar into the clogged condensate line. Give it at least half an hour to dissolve the blockage. You can also use peroxide or hot water with a small amount of dish soap.

3. Flush and double check. Flush the line with fresh water. Replace the drain cap, and then turn on the AC unit. Check the drip pan over the next several days for any more signs of a clog in the AC drain line.

When Should You Call Our AC Pros?

If your AC drain line keeps clogging, it’s time to bring in High Country HVAC. Our AC pros are here for you with a full line of air conditioner repair, maintenance, and installation services. We’re available for emergencies too. Give us a call today.

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