1. Turn on the AC system.
2. Look for any visible leaks. Oil residue or refrigerant may be visible around a leak, or you may be able to hear a hissing sound.
3. Use a UV dye. If you can't find any visible leaks, you can use a UV dye to help you find them. Add the UV dye to the refrigerant, then use a UV light to inspect the system. The dye will glow where there is a leak.
4. Find the source of the leak. Once you have found a leak, you need to determine what caused it. This could be a damaged component, a loose hose, or a bad seal.
Repair the AC Leak
1. Replace the damaged component. If the leak is caused by a damaged component, such as a compressor, condenser, or evaporator, you will need to replace the part.
2. Tighten a loose hose. If the leak is caused by a loose hose, you can usually tighten it with a wrench.
3. Replace a bad seal. If the leak is caused by a bad seal, you can usually replace it with a new one.
Recharge the AC System
1. Once the leak has been repaired, you will need to recharge the AC system. This can be done by a professional or with a do-it-yourself kit.
2. Follow the instructions on the kit to recharge the system.
3. Once the system is recharged, turn on the AC and make sure that it is working properly.
