How to Repair an Air Conditioner Freon Leak

Air conditioner installed in a window.
What You'll Need
Water Hose
Spray Nozzle
Leak Sealant or Compound

Air conditioners work hard and there is a variety of reasons that it may begin to leak freon. Whatever the cause, it’s important to fix it so that your air conditioner continues to produce cool air. This type of repair should be part of the regular maintenance associated with an air conditioner unit and performed at least annually, either prior to the first use of the season or when it has been put away for colder months.

It should be noted that most newer air conditioner units no longer use freon as a cooling refrigerant because of the harm that it does to the environment. An older air conditioning unit that you own that still uses freon should eventually be replaced in favor of a more green and environmentally-friendly model. For now, a freon link should be addressed immediately to prevent any further environmental damage.

Step 1 - Remove Unit from Window

Remove the air conditioner unit from the window and place it on a hard, firm surface such as wood or concrete. Do not place the air conditioner on the ground or an earth surface with leaves or dirt.

Step 2 - Remove the Outer Cover

Man repairing an air conditioning unit

Use the screwdriver to take off the outer housing of the air conditioner. Place the housing cover to the side where it will not become damaged with the screws that you removed.

Step 3 - Remove Debris and Bacteria from Drain Tray

While you have the air conditioner open remove all debris and spray the air conditioner with water using the water hose and spray nozzle. All of the debris that collected in the drain tray near the vent coils should be removed.

Step 4 - Locate the Freon Leak and Seal

Remove any air filters insider the air conditioner unit and locate the air compressor. Evidence of the area where the leak took place should be easy to locate. Apply a stop leak compound that can be purchased from an auto supply store. The leak sealant or compound should be applied as instructed on the can.

Step 5 - Replace the Cover and Test the Air Conditioner

hands in front of an air conditioner

Place the cover back on the front of the air conditioning unit and place it back into the window unit. Operate the unit and observe for any further leaks. If the air conditioner continues to leak, remove the cover and spray the inside with a leak sealant again. If this does not rectify the situation, call a qualified repair technician to service the unit.