Why Does Your AC Leak Gas? Top Causes & How to Fix It

Posted on : 11-Apr-2026

There is nothing worse than turning on your air conditioner on a scorching summer day in Delhi, only to find it blowing warm air. One of the most common reasons behind a sudden drop in cooling is an AC gas (refrigerant) leak.

Unlike a car that consumes fuel, an AC system does not "consume" gas. The refrigerant runs in a closed loop. If the gas level is low, it means there is a leak somewhere in the system. But why do these leaks happen? Let's dive into the most common causes and how you can spot them.

1. Corrosion on Copper Coils

The metal components of your AC, particularly the copper coils, are constantly exposed to moisture, humidity, and atmospheric chemicals. Over time, this exposure can lead to a specific type of rusting known as "formicary corrosion." This creates microscopic holes in the copper tubes, allowing the high-pressure gas to slowly escape.

2. Wear and Tear from Vibrations

Your AC compressor generates a lot of vibration while running. Over the years, this constant shaking can loosen the joints and connections within the copper piping. Once a joint becomes loose, the refrigerant can easily leak out.

3. Poor Installation

If the AC was not installed correctly from day one, you are likely to face gas leakage issues. Improperly tightened flare nuts, poor welding, or bending the copper pipes at sharp angles during installation can create weak points that eventually give way under pressure.

4. Accidental Physical Damage

Sometimes, the cause is purely accidental. While cleaning the indoor unit, moving furniture, or doing construction work nearby, the delicate refrigerant lines can get damaged. Even a tiny pinhole caused by a sharp object is enough to empty the gas over a few days.

Signs Your AC is Leaking Gas

How do you know if your cooling issue is actually a gas leak? Look out for these warning signs:

• No Cooling: The AC blows room-temperature or warm air instead of crisp, cold air.

• Hissing Sounds: A distinct hissing or bubbling noise coming from the indoor or outdoor unit usually indicates gas escaping under pressure.

• Ice on the Coils: Low refrigerant causes the evaporator coils to freeze over. If you see ice buildup inside your AC unit, turn it off immediately.

• High Electricity Bills: Because the AC struggles to cool the room, the compressor runs non-stop, leading to a sudden spike in your power bill.

What Should You Do?

Never ignore a gas leak! Simply "topping up" the gas without fixing the actual leak is a waste of money, as the new gas will just leak out again. Moreover, running an AC with low gas can permanently burn out your expensive compressor.

Need Expert AC Repair?

If you suspect a gas leak in your unit, it is time to call in the professionals. At Delhi Daily Service, our expert technicians use advanced tools to pinpoint the exact location of the leak, repair it using high-quality brazing, and then refill the refrigerant to the exact factory specifications.

Whether you need a quick repair or a deep jet machine service, we provide the most reliable AC service and maintenance in Rohini and across Delhi.

Contact Delhi Daily Service today to book your inspection and keep your home cool and comfortable all summer long!