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Quick Fixes For A Leaking Window Air Conditioning Unit

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If your window air conditioning unit is leaking, the drain pan, filter, or condensate line may be to blame. Assessing each area will help you determine which repair needs to be made. Turn the power off to your unit before completing any of the following inspections and repairs.


  • scrub brush
  • mild detergent
  • water hose
  • epoxy 
  • small paintbrush
  • filter
  • flashlight
  • shop vacuum cleaner
  • pipe brush

Drain Pan

The drain pan collects condensation from your air conditioner. If it is clogged or damaged, water will continue to drip each time that your unit is on. Remove the cover to your unit by gently prying it off. The drain pan will be located underneath the metal coils. Slide the pan out and empty it outside. Clean it out with soapy water, a scrub brush, and a water hose.

If the pan is cracked, it can be patched with a small amount of epoxy. Squeeze a thin line of epoxy over the damaged area and smooth it out with a small paintbrush. Once the epoxy has dried, replace the pan. 


If the filter inside of your unit becomes clogged, air won't be able to flow freely through the vents. As a result, ice may begin to form on the coils. As the surface melts, water will drip out of the unit and you may notice that your air conditioning unit is no longer blowing cool air. Pull the cover off of your unit and slide the filter out of its holder. In many models, the filter is located directly behind the cover. Clean the filter off with a scrub brush and soapy water. If the filter is extremely dirty, replacing it will give you better results. 

Condensate Line

The condensate line drains excess condensation to an area outside of your house. If it has debris stuck inside of it, water will back up and could cause a mess inside of your home. Locate the end of the condensate line and shine a flashlight inside of it to spot any dust or dirt that is stuck inside. Use a pipe brush to loosen the debris. Attach a shop vacuum cleaner hose to the end of the line. Turn the power on for a minute as the vacuum empties the line. 

Turn your unit back on after any of the repairs are made. If cool air blows out and you don't see any water dripping, the work that you completed was successful. Keep your unit clean and prevent clogs by removing dust from the coils several times a year and changing the filter regularly. For more information or help with repairs, contact a local HVAC company like One Hour Air Conditioning & Heating (West Pasco)