How to find a small refrigerant leak?

Author: Dr. Graciela Barton  |  Last update: Monday, July 14, 2025

Prepare a solution of soapy water, using about one liter of water and 0.5 teaspoon of dish soap. Spray the joints of the refrigerant lines with the solution. Look for large bubbles at the joints. Bubbles will indicate a Freon leak.

How to locate a refrigerant leak?

Use Soapy Water

The soap bubble method is one of the most convenient ways to detect a refrigerant leak. All you need is a soapy water solution and a spray bottle. Spray the soapy water on the suspected leak point. If there's a leak, the leaking refrigerant will cause the water to bubble.

Can a small Freon leak make you sick?

Freon itself is not particularly poisonous, so a slow leak isn't going to harm anyone. It can suffocate you, but moderate exposure is not very harmful Refrigerant Poisoning: Symptoms, Treatments & Prevention.

Where is the most common place for a Freon leak?

3 Frequent Air Conditioning Refrigerant Leak Sites
  1. Capillary Tube. The capillary tube is the simplest example of a throttling device. ...
  2. Flare Fittings. Flare fittings can be found anywhere a capillary tube or other section of metal tubing attaches to an air conditioning component. ...
  3. Evaporator Coil.

What is the best method of detection for refrigerant leaks?

Soap bubble method: This is the cheapest method of detecting refrigerant leaks. It involves applying a soap solution to potential leak points and watching for bubbles. If there are any leaks, bubbles will appear. Ultraviolet method: This is otherwise known as the fluorescent dye method.

5 WAYS to FIND a Refrigerant LEAK!

What is the most common source of refrigerant leaks?

The most common reasons for refrigerant leaks include:
  • Flare is too small.
  • Ridge on the flare.
  • Sealant on threads.
  • Leaking and/or missing Schrader caps.
  • Missing TEV adjustment cap.
  • Leaking neoprene o-rings.

What is the most basic but effective method of detecting leaks?

The most basic type of leak testing is the submersion or dunk test (also referred to as bubble testing), in which you pressurize the part, submerge it in water, then look for gas bubbles. Most commonly, compressed air is used for dunk testing and will test the part at various pressures and time frames.

How much does it cost to find a Freon leak?

If you simply need a top off of refrigerant, you can expect to pay anywhere from $160-$375. If you need a repair for the leak itself, you can anticipate a higher bill. For refrigerant leak detection and air conditioning repair you may pay anywhere from $550 to $1,600.

What are signs of Freon leak?

Signs you may have a Refrigerant Leak:
  • Hissing Sounds. There may be a hole or crack in the coils that the refrigerant runs through, which can produce a hissing sound when the system is running. ...
  • Not Cooling. Check the air coming from your vents. ...
  • Increase in Humidity. ...
  • Higher Electric Bills. ...
  • Frozen Coils. ...
  • Exhaust Odor.

What is the most common location for compressor leaks?

The most common ones are:
  • Couplings, hoses, tubes and fittings.
  • Filters regulators and lubricators.
  • Pipe joints.
  • Pressure regulators.
  • Point of usage devices.
  • Disconnections.
  • Thread sealants.
  • Valves.

Can I stay in my house with a refrigerant leak?

Freon leaks can be hazardous. Direct exposure to AC refrigerant can cause health problems such as headaches, dizziness, and respiratory issues. If you suspect a refrigerant leak, it's crucial to ventilate the area and seek professional help from HVAC professionals to prevent further damage and health risks.

What happens if you breathe in a little Freon?

Severe lung damage may occur. Survival past 72 hours usually means the person will have a complete recovery. Sniffing Freon is extremely dangerous and can lead to long-term brain damage and sudden death.

Can you smell a refrigerant leak?

Freon is generally odorless in small quantities, making it difficult to detect leaks based on smell alone. However, when a leak occurs, a faint, sweetish odor may be noticeable. Some people describe this smell as similar to acetone, nail polish remover, or even chloroform.

Can you fix a refrigerant leak yourself?

You need to have the experts find the cause of the leak, fix it, and restore more refrigerants. Trying to restore refrigerant alone won't resolve the underlying cause of the leak.

Does Freon leak inside or outside?

If you suspect a freon leak, head outside to the exterior AC unit. The evaporator coil is in the back of your AC unit and leads directly into your home. If this coil is physically cold and there are visible signs of frost, your refrigerant levels may be leaking.

How to find a refrigerant leak?

Prepare a solution of soapy water, using about one liter of water and 0.5 teaspoon of dish soap. Spray the joints of the refrigerant lines with the solution. Look for large bubbles at the joints. Bubbles will indicate a Freon leak.

Does turning off AC stop Freon leak?

Because the system is pressurized, Freon will continue to leak from the air conditioner even when it's off. A technician will inspect your system, repair leaks, and recharge the system with refrigerant.

Is a Freon leak an emergency?

Check to see if the HVAC unit is blowing warm air. If you discover you have a Freon leak, evacuate the building and contact your HVAC technician for immediate repairs.

How long will Freon last with a leak?

If a leak is present, the refrigerant will simply leak out as soon as it is replaced. So, the coolant will last no more than a few weeks to a few months, depending on the severity of the leak. There may also be more than one leak, which could cause the refrigerant to disappear sooner.

Is it worth it to fix a Freon leak?

Refrigerant leaks are more common in air conditioners that are five years old or more. Repair the issue if the system is relatively young. It probably has a fair amount of life left, especially if it's less than 10 years old, so repairing a leak should be worthwhile.

Can you seal a Freon leak?

Yes, HVAC leak sealers work when you want a quick temporary fix for small leaks. As long as you plan to get professional repairs in the near future, sealers provide an excellent solution. Just be sure to use a product that works well with your HVAC system.

What's the easiest way to find a leak?

Checking your water meter is among the best ways to determine if you have a leak. Start by turning off all the water in the home. Observe the water meter and see if it's moving. If the meter continues to move despite all water faucets being turned off, you have a fast-moving water leak.

What is most effective for locating the general area of a small leak?

The most effective methods for locating the general area of a small leak are: Ultrasonic leak detectors, and. Electronic leak detectors.

What is the simplest and cheapest method of leak testing?

Bubble Testing is a fast, simple, and inexpensive test that can be done using the immersion or film solution techniques.

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