How to Clean Your AC Drain Line With Vinegar

How to Clean Your AC Drain Line With Vinegar

how to clean ac drain line vinegarWhen cleaning their homes, most homeowners dust, vacuum, sweep, and mop, but many neglect to regularly clean an important part of their home comfort: the AC drain line.

Although it may not seem like a problem, your AC drain line produces condensation and when your AC drain line is not cleaned regularly it can become a spawning ground for algae, mold, and other bacteria. These bacteria can build up and slowly clog your AC drain line over time, causing your AC system to function inefficiently, and if the clog gets big enough, to not work at all.

All central AC systems should have a device called a float switch that turns off the AC unit when the drain line fills with water and begins to leak. This switch’s primary function is to prevent water from overflowing and damaging floors or other parts of your home. Until that water clears, the system will not turn on.

When the excess condensation cannot escape through the drain, water can leak from the AC unit and cause substantial water damage to your home.

It’s best to have your entire AC system maintained regularly by a professional, but cleaning your AC drain line is a maintenance task you can easily do yourself.

Is Bleach or Vinegar Better for Your AC Drain Line?

We recommend using vinegar instead of a bleach solution because bleach can be harmful to your AC system if your drain line has copper tubing. Using vinegar will not damage your system.

Spilling bleach can also ruin carpet or clothing, whereas vinegar will just leave a strong odor.

How to Clean An AC Drain Line With Vinegar in 5 Steps

One of the most efficient ways to clean your AC drain line is by flushing it with vinegar. By pouring a cup of vinegar down your AC drain line you kill the algae, mold, and other bacteria that can build up and cause clogs.

Materials

  • 1 cup of vinegar
  • 1 cup of warm water (optional)
  • Funnel (optional)
  • Rags or washcloths

Directions

Follow these steps to quickly and safely clean your AC drain line.

Step 1. Turn off your air conditioner. Before doing any work, turn off your AC system at the thermostat and the breaker or disconnect/shut-off box to be safe.

Step 2. Locate the drain line. Your AC drain line is a white, T-shaped PVC tube that’s generally located inside a utility closet or your garage, but in some cases, it will be in the attic. Depending on your AC system, it might be hidden by a removable access panel.

Step 3. Remove the cap. There should be a white plastic cap on top of the PVC tube and you should be able to remove this by hand.

Step 4. Pour the vinegar and put the cap back on. Slowly pour a cup of vinegar down your AC drain line. Using a funnel here is optional and will reduce your chances of spilling the vinegar. Don’t forget to put the cap back on when you’re done.

Step 5. Wait 30 minutes to an hour before turning your AC back on. The vinegar will kill the bacteria, but it may take some time to work, especially if you have not cleaned your AC drain line recently or had a professional perform maintenance on your AC system.

Optional: You can pour a cup of warm water down your AC drain line to help flush out any bacteria build-up or to remove the vinegar odor.

How Often Should You Put Vinegar in Your Air Conditioner?

For the best results and to keep your AC drain line clear, you’ll want to repeat this cleaning routine monthly or at least every other month. This will eliminate any algae, mold, or other bacteria or sludge buildup in your AC drain line and prevent your drain line from clogging up.

17 Replies to “How to Clean Your AC Drain Line With Vinegar”

    1. Hi Michael, that’s a great question and I’ve updated the article to provide more information around that.

      You do not need to add water with the vinegar and it’s better if you don’t. However, you can pour a cup of warm water down your AC drain line about 30 minutes after the vinegar to help flush out any bacteria build-up or to remove the vinegar odor, but adding vinegar alone is all you need to clean it.

    1. Hi John,

      I wouldn’t recommend attaching the shopvac to the top of the line unless you have to. Clogs generally don’t form at the top of the line and you’ll be going against gravity. Also, the water the shopvac sucks out is going to be grimy and gross. You don’t want to risk spilling this water inside your home. It’d be much better to attach the shopvac to the bottom and dispose of the water outside.

      For more information, check out our guide for unclogging an AC drain line here: https://gabesguides.com/hvac/how-to-unclog-clogged-ac-drain-line/

  1. I have read different amounts of vinegar from 1/4 cup, 1/2 cup to 1 cup… it is confusing… will it Hurt to use more or less?

    1. Hi Ruth,

      You won’t hurt your AC drain line by pouring too much or too little vinegar. However, the more vinegar you use the more effective the cleaning will be, which is why we suggest a cup, especially if you live in a humid climate that promotes mold and mildew growth.

      If you suspect your drain line is clogged, depending on where the clog is, you could overfill the drain line by pouring too much vinegar, but that should not cause any damage to your system, only a small mess.

      Instead of pouring vinegar into a clogged AC drain line, check out our step by step directions to unclogging an AC drain line here: https://gabesguides.com/hvac/how-to-unclog-clogged-ac-drain-line/

    1. Hi Ruth,

      Yes. You’ll want to wait 30 minutes to an hour to allow the vinegar to kill the bacteria before turning the AC back on. I’ve updated the article to clarify this, thank you for your question.

  2. I’ve been doing this for some time but continually have to clean the pump every 6 months or so due to buildup, is there some other way to prevent this issue?

    1. Hi Alfredo,

      Your AC drain line is a white, T-shaped PVC tube that’s generally located inside a utility closet or your garage, but in some cases, it will be in the attic. Depending on your AC system, it might be hidden by a removable access panel.

  3. Mine is located in the attic, but there’s a clear tube that dips and goes up, very close to where i pour the vinegar. I noticed half of the vinegar got stuck there so I waited 30 min then poured a cup of water to push the vinegar out of there. Will that water now sitting in that clear tube cause any issues? Thank you for your help and time.

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