How to Find an Air Conditioning Leak 1 Method 1 of 3: Locating the Refrigerant Lines. Look behind your home to see if you have an outdoor condenser. … 2 Method 2 of 3: Testing with Soapy Water. Fill a spray bottle with a soapy water solution. … 3 Method 3 of 3: Using an Electronic Leak Detector. Power on your electronic leak detector. …
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