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Troubleshooting · September 18, 2026

Common Causes of AC Refrigerant Leaks

Refrigerant is the lifeblood of your air conditioner. It is never used up during normal operation, so if your system is low, there is a leak somewhere. Understanding where leaks come from helps explain why professional repair is so important.

Why Leaks Matter

When refrigerant escapes, your AC loses cooling capacity, runs longer, uses more energy and can suffer a compressor failure, which is the most expensive repair of all. Simply topping off the refrigerant without fixing the leak only delays the problem and releases more refrigerant into the atmosphere.

Corrosion in the Coils

The most common cause of leaks is formic acid corrosion, which forms tiny pinholes in the copper tubing of the evaporator coil over time. This is especially common in older systems and in homes with certain indoor air conditions.

Factory Defects and Poor Installation

Loose joints, weak solder connections or manufacturing flaws can cause leaks even in relatively new systems. Quality installation by a licensed technician reduces this risk significantly.

Vibration and Wear

Years of normal operation create vibration that can loosen connections and wear on fittings, gradually opening small leaks at joints and service valves.

Physical Damage

The outdoor unit is exposed to the elements, lawn equipment and curious pets. Bent fins or damaged lines can develop into leaks.

How Professionals Fix It

A technician uses electronic detectors, UV dye or pressure testing to pinpoint the leak, repairs or replaces the affected component, then recharges the system to the correct level. This proper approach restores performance and protects your compressor for the long term.

Need Help From a Cooling Specialist?

Whether you need a repair, a tune-up or a new system, Emergency Cooling NJ is here to help homeowners across New Jersey. We offer AC repair, maintenance, installation and 24/7 emergency service in every NJ county. Call us at 862-660-7726.

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