Dealing with an AC refrigerant leak in your car or home air conditioner can be frustrating and costly. Left unchecked, AC leaks will cause your system to gradually lose refrigerant and become less efficient at cooling your space. Fortunately, easy-to-use AC leak stoppers are available that can quickly seal small leaks and get your AC back to blowing cold air.
In this guide, we’ve reviewed the top-rated temporary AC leak repair products in 2023. We compared critical factors like leak-sealing ability, compatibility, ease of use, and value. Whether you need a fast-acting stop leak additive or an external AC leak sealer, our recommendations will help you find the best refrigerant leak stopper for your specific AC system and leak type.
With the ability to plug leaks in condenser coils, rubber hoses, O-rings, and other common problem areas, these quick DIY solutions can save you the hassle and expense of a professional AC repair. Read on for our picks of the most effective, affordable, and easy-to-use AC leak stoppers available.
Leak Saver Direct Inject Ultimate 3-in-1 Leak Sealant
This leak sealant is compatible with all systems and refrigerants, excluding ammonia, making it versatile for central air conditioners, car and automotive air conditioners, refrigerators, heat pumps, commercial refrigeration systems, and more. It also works with all refrigerants including R410A Freon, R22 and replacements, R134A, R1234yf, R404A, R290, R600a, among others.
In addition to its sealing capabilities, the Leak Saver Ultimate also includes a moisture remover and UV dye. This allows users to seal their leaks, remove system moisture, and find large leaks using UV dye. The product is easy to inject into the system using a basic manifold gauge set or the Leak Shot Injection Kits offered by the company.
Despite its effectiveness, some users have reported installation challenges due to the fluid tube’s stiffness and issues with the valves at both ends. However, the manufacturer assures customer satisfaction as a priority and encourages customers to contact them if they are unsatisfied with the product.
The Leak Saver, Direct Inject Ultimate, is available on Amazon, with discounts offered when purchasing multiple units. The product is made in the USA and weighs 3.2 ounces.
Leak Saver Direct Inject Refrigerant Leak Sealer
The Leak Saver Direct Inject Refrigerant Leak Sealer is designed to permanently seal small refrigerant leaks in HVAC systems. The sealant reacts with the air and moisture at the leak site, similar to how blood reacts to a cut in the body. This reaction creates a permanent seal, preventing further leakage. The product is also used for preventative maintenance, as its active ingredient circulates safely within the system to seal potential future leaks.
Since its introduction in 2015, over three million units of this sealant formula have been sold, making it a trusted choice among HVAC professionals. It is compatible with all refrigerants and oils except ammonia and can be used in various systems, including Split Systems, Heat Pumps, Commercial Unit Coolers, and Refrigeration Systems.
The product is easy to inject into the system using a basic manifold gauge set or the Leak Shot Injection Kits. A standard 134A to 1/4” charging adapter is required for automotive systems, while mini-splits may need a 5/16” to 1/4” charging adapter.
The Leak Saver Direct Inject Refrigerant Leak Sealer is made in the USA by HVAC professionals and weighs 3.2 ounces. Its dimensions are 6.5 x 9.6 x 0.6 inches, and carry the model LS-05. The manufacturer guarantees customer satisfaction, offering a free replacement if the product fails to seal a leak when installed by certified HVAC techs.
Customer reviews indicate that the product has successfully sealed leaks in various applications, although some users have reported that it did not work in their specific cases. Despite this, many customers have expressed satisfaction with the product’s performance and ease of use.
Leak Saver Direct Inject UV – Refrigerant Leak Sealer
The Leak Saver Direct Inject Refrigerant Leak Sealer is a highly effective solution for sealing small refrigerant leaks in HVAC systems. The product reacts with the air and moisture at the leak site, similar to how blood reacts to a cut in the body, thereby creating a permanent seal. This sealant formula was updated in 2022 and is designed to work with most HVAC systems up to 5 tons.
Since its introduction in 2015, over three million units of this sealant have been sold, making it a trusted choice among HVAC professionals. It is compatible with all refrigerants and oils except ammonia and can be used in various systems, including Split Systems, Heat Pumps, Commercial Unit Coolers, and Refrigeration Systems.
HVAC professionals manufacture The product in the USA and is easy to install without messy syringes, hoses, or pressurized cans. It can be injected directly into the system using a basic manifold gauge set or the brand’s Leak Shot Injection Kits. However, a standard 134A to 1/4” charging adapter is required for automotive systems, and mini-splits may require a 5/16” to 1/4” charging adapter.
Customer reviews indicate that the product is generally effective, although success rates can vary depending on the specific application. Some users have reported successful use in home and auto A/C units, while others have found it less effective for certain leaks. Despite this, many customers are satisfied with the product and would recommend it to others. The company also offers a satisfaction guarantee, promising to provide another unit at no cost if the first fails to seal a leak, provided certified HVAC techs install it.
The product dimensions are 6.5 x 9.6 x 0.6 inches, weighing 3.2 ounces. The item model number is LS-05. Please note that products with electrical plugs are designed for use in the US, and international users may require an adapter or converter.
Red Angel 49496 A/C Stop Leak – 2 Ounce
The Red Angel 49496 A/C Stop Leak is a product manufactured by BlueDevil Products. It is designed to repair and seal leaks in automotive air conditioning systems, specifically condensers, evaporators, connection hoses, gaskets, and O-rings. The product is activated at the leak point, ensuring it does not crystallize with existing oxygen or moisture in the system.
The Red Angel A/C Stop Leak is safe and contains no solid or particulate matter that could clog the A/C system or harm a recovery unit. Instead, it forms a chemical weld, sealing leaks in R-12 or R-134a systems. This product is guaranteed to provide a permanent seal, making it a reliable solution for A/C leaks.
In addition to its primary function of repairing leaks, the Red Angel A/C Stop Leak also continues to lubricate and condition working parts after the AC leak repair is achieved. This makes it an excellent preventative measure against future leaks.
The product is available on Amazon and sold by American Air USA LLC. It comes in a 2-ounce package and is priced at $24.90. Customers can enjoy fast, free delivery with Amazon Prime, and the product is eligible for free returns.
Customer reviews indicate that the product has effectively sealed leaks, with one user stating that their A/C remained cold and leak-free three months after application. However, the reviewer recommends using this product as a last resort after all other options have been exhausted.
InterDynamics Car Air Conditioner Refrigerant Stop Leak Kit
The InterDynamics Car Air Conditioner Refrigerant Stop Leak Kit is a professional-grade product designed to seal metal and rubber leaks in various components of car air conditioning systems. The kit uses R-134a refrigerant and is specifically designed for motor vehicle AC systems. It comes with a recharge hose and is safe for all R-134a systems.
The product is powered by corded electricity and features a touch control system. It is installed using a split system method. The kit includes a 3 oz container with a self-sealing valve, making it easy and efficient. The product is lightweight, weighing only 8.8 ounces, and comes in multi-color.
InterDynamics, the manufacturer of this product, was established in 1992 and has since been committed to providing high-quality products. Customers highly rate this particular product for its ease of use, value for money, and accuracy. Many users have reported that it effectively sealed leaks in their car’s AC system, resulting in cold air and improved performance. However, some users have noted issues with the included hose, stating that it is short and may leak during use.
It’s important to note that this product is designed for use in the US and may require an adapter or converter for use in other countries due to differences in outlets and voltage. The manufacturer offers a warranty that can be requested from customer service.
Despite its effectiveness, potential buyers should be aware of the product’s safety information, as it carries a warning for cancer and reproductive harm.
BlueDevil Products Red Angel 00222 A/C Stop Leak & Conditioner
The BlueDevil Products Red Angel 00222 A/C Stop Leak & Conditioner is a specialized product that repairs leak points in automotive air conditioning (A/C) systems. The product, also known as Red Angel “One Shot,” is intended for retail customers seeking a quick and easy installation. It comes with an attached coupler, making it a complete delivery system. This aerosol product is specifically designed for R-134a systems only, and each unit includes a refrigerant charge.
The product can repair leak points in various components of the A/C system, including condensers, evaporators, connection hoses, gaskets, and o-rings. It contains no solid or particulate matter that could clog the A/C system or harm the recovery unit. The product contains 2.5 ounces of refrigerant and is easy to use.
The Red Angel A/C Stop Leak & Conditioner is guaranteed to provide a permanent seal and will not clog or damage the A/C system or recovery unit. It is also safe for shop equipment and is non-clogging. The product now includes UV dye for leak detection.
However, it’s important to note that this product is hazardous to humans and animals and should be kept out of reach of children. It should not be inhaled or come into contact with the skin. Protective eyewear should always be used when handling this product. It should not be punctured or incinerated and should be kept away from prolonged exposure to sunlight, heat from radiators, or other heat sources.
Customer reviews indicate mixed results, with some users reporting successful sealing of leaks and improved A/C performance, while others experienced issues with the can or connections, resulting in product loss. Some users also said that the product did not work for them. Despite these mixed reviews, many customers found it worth trying due to its potential to save significant repair costs.
ComStar A/C Zero-Leak, Permanent”Stop Leak” for A/C Systems
ComStar A/C Zero-Leak is a specially formulated product designed to permanently stop small leaks in air conditioning systems. It works effectively on evaporators, condensers, gaskets, and seals. The product is environmentally friendly and can be used in various settings, including automotive, commercial, and residential air conditioning applications.
One of the key features of ComStar A/C Zero-Leak is its non-hardening and polymer-free nature. This means it does not form hard particles when it comes into contact with moisture in a system, thus eliminating the risk of clogs. It is compatible with POE-based, PAG-based, and mineral-oil-based mobile AC lubricants.
The product comes in a 4-ounce plastic container and can be left in an operating system for preventive maintenance. For larger systems over 12 tons, an appropriate ratio of approximately 1 oz per every 6 tons over the original 12 tons is recommended.
Customer reviews indicate that the product effectively seals leaks and maintains cold air conditioning. However, some users have reported difficulties getting the product into the system, suggesting the need for charging hoses and a bit of ingenuity. Despite this, many customers have expressed satisfaction with the results, noting that their air conditioning systems remained leak-free and cold after using ComStar A/C Zero-Leak.
Diversitech 972KIT SuperSeal Sealant Total,1.5-5T
The Diversitech 972KIT SuperSeal Sealant Total,1.5-5T, is designed to seal air conditioning system leaks. It is sold by IAQSupplyHouse and fulfilled by Amazon. The product was made available on June 9, 2010, and is manufactured by Cliplight. The package dimensions are 6 x 3.25 x 2.75 inches, weighing 2 ounces.
The product is priced at $50.00, saving customers 21% from the typical price of $62.95. This price is determined using the 90-day median price customers pay for the product on Amazon, excluding fees paid during limited-time deals.
The Diversitech 972KIT SuperSeal Sealant Total,1.5-5T, has a best sellers rank of #58,284 in Industrial & Scientific and #111 in Industrial Thread Sealants. It has an overall customer rating of 3.8 out of 5 based on 219 global ratings.
The product does not add refrigerant to the system but adds UV dye and leak sealant. Users have reported mixed results with the product. Some users have found that the product can save them a lot of money if they educate themselves and follow the instructions carefully. However, others have reported that the product did not work for them, even when they followed the instructions correctly.
It’s important to note that the effectiveness of this product may depend on the specific issue with the AC unit. The product may be ineffective if the problem is more complex than a simple leak, such as low Freon levels, a clogged AC refrigerant filter, or a kink in the refrigerant lines.
A/c Leak Freeze 00284 – 1.5oz w/ 1/4″ Adapter
The A/C Leak Freeze 00284 is designed to permanently seal leaks in air conditioning and refrigeration systems. It is suitable for both residential and commercial HVACR applications. The product is compatible with all standard refrigerant gases, including R11, R12, R13, R14, R22, R23, R123, R124, R134a, R141b, R404a, R407c, R410a, R502, R503, R507, and R600.
The A/C Leak Freeze is polymer-free and has been tested to ensure it does not clog the A/C compressor or recovery unit. It is not activated by moisture or oxygen, making it an ideal preventive maintenance and leak protection solution. The product can seal leaks up to 0.05 mm and comes with a 1/4″ adapter.
The application process involves attaching the reusable adapter to the low side of the system, injecting the product quickly once the system is running, and recharging the system after the injection. Depending on the system pressure, different methods of application may be used. For low-pressure systems (40psi and under), the product can be pushed in with the syringe plunger. For medium-high pressure systems (80psi and under), the syringe can be placed in a standard caulk gun and slowly ratcheted into the system. For high-pressure systems (above 80psi), the system should be pumped down to reduce pressure on the low side before using either of the previous methods.
The product has received positive user reviews, with one customer noting that their refrigerator ran more relaxed and quieter after applying A/C Leak Freeze. However, it’s important to note that if the system loses a pound of refrigerant within two weeks, A/C Leak Freeze may not seal the leak. Also, the product might not work effectively if the hole or leakage is more significant than 0.5mm.
The product weighs 6.4 ounces and has package dimensions of 8.8 x 6.9 x 1.2 inches. The manufacturer part number is 00248, and the item model number is 8542048369. As of May 7th, 2022, it is unclear when or if this item will be back in stock.
Simbow Freon Leak Detector with LED Light
The Simbow Freon Leak Detector with LED Light is a versatile, portable tool to detect refrigerant and halogen leaks. This upgraded 2021 model is compatible with various devices, including R134a, R410a, R22a, R600a, R290, CFCs, HCFCs, and HFCs. The battery-powered detector requires four AAA batteries, which are not included in the package.
The device features an industry-style design and comes in a WJL6000+LED color. Its dimensions are 1.37 x 1.37 x 6 inches, and weighs 0.45 pounds, making it compact and lightweight. The detector operates at a humidity level of 95 percent and can function in temperatures ranging from 30 to 125 degrees Fahrenheit.
The Simbow Freon Leak Detector is equipped with both audible and visual alarms for gas leakage indicators. It also includes a dual-color visual display of battery voltage. The device offers seven adjustable sensitivity levels, with a maximum sensitivity of 0.21oz/yr, and can respond within three seconds after a warm-up period of six seconds.
The detector has a UV lamp and flashlight, useful for illuminating dark and small places. The UV lamp is used with a fluorescent agent. A flexible probe around 7.9 inches allows detections in challenging and hard-to-reach areas. Once a leak is detected, a siren sound and quick flash will be activated.
The package includes the detector, a carry bag, and a user manual. The sensor is part of the SIMBOW HVAC TOOLS FAMILY, which also includes other essential tools for A/C work, like a Refrigerant Scale with a capacity of 220 lbs. The product is currently out of stock, and there is no information on when it will be available again.