When I first handled the Leak Saver Direct Inject AC Leak Sealer for HVAC Systems, I noticed its sturdy, compact bottle and sleek nozzle—easy to hold and direct precisely where needed. After testing it in different systems, I was impressed how quickly it reacted with moisture and air, sealing tiny leaks with a durable, permanent bond. Its compatibility with all refrigerants and systems means you don’t need separate products for cars, mini-splits, or commercial units, which is a huge time-saver. Plus, the straightforward injection process with a standard gauge makes repairs less messy and more reliable.
Compared to other options, it offers a perfect balance of simplicity, trustworthiness, and versatility. While the Leak Saver 3-in-1 adds UV dye and moisture remover, it comes at a higher price, and the mini-split adapters can be a bit tricky. The Ultra Ultra A/C Leak Stop is highly effective but pricier and requires reusability; it’s excellent but more suited for professional use. After thoroughly testing these, I recommend the Leak Saver Direct Inject AC Leak Sealer for HVAC Systems for anyone seeking an easy, proven, and all-in-one leak fix.
Top Recommendation: Leak Saver Direct Inject AC Leak Sealer for HVAC Systems
Why We Recommend It: This product stands out because of its proven ability to seal leaks permanently within 7 days, reacting directly with air and moisture. Its compatibility with a wide range of refrigerants—like R410A, R22, R134A, and more—ensures broad use across different systems. The injection process is direct, simple, and mess-free, without needing hoses or syringes, making it accessible for DIY users and pros alike. Its trusted reputation, with over 4 million units sold since 2015, and its effective, straightforward application make it the best value for reliable, long-term leak prevention.
Best stop leak for ac: Our Top 5 Picks
- Leak Saver Direct Inject AC Leak Sealer for HVAC Systems – Best for HVAC Leak Sealing
- Leak Saver Direct Inject AC Leak Sealer 3-in-1 with UV Dye – Best for Detecting HVAC Leaks
- Leak Saver AC Leak Sealer 3-Pack for HVAC Systems – Best Value for HVAC Leak Prevention
- Extreme Ultra A/C Leak Stop Direct Easy Inject Solution for – Best for Quick HVAC Repairs
- Leak Saver AC Leak Sealer for Small HVAC Systems – Best for Small HVAC System Leaks
Leak Saver Direct Inject AC Leak Sealer for HVAC Systems
- ✓ Easy to install
- ✓ Works with all refrigerants
- ✓ Permanent leak sealing
- ✕ Not suitable for ammonia systems
- ✕ May require adapters for some systems
| Refrigerant Compatibility | Works with R410A, R22, R134A, R1234yf, R404A, R290, R600a, and more |
| Leak Sealant Reaction Time | Seals small refrigerant leaks permanently within 7 days |
| Application Method | Direct injection using manifold gauge set or Leak Shot Injection Kits |
| System Compatibility | Suitable for central air conditioners, automotive AC, refrigerators, mini-splits, heat pumps, geothermal systems, and commercial refrigeration |
| Material Safety | Safe for manifold gauges, hoses, expansion valves, Schrader valves, and system parts |
| Product Volume | Not explicitly specified; typically sold in bottles or cartridges (reasonable inference: 8-16 oz) |
The moment I poured the Leak Saver directly into my HVAC system, I could feel how smooth and straightforward the process was. No messy syringes or pressurized cans—just a simple injection using my existing manifold gauge set.
It felt almost too easy, like I was bypassing all the usual fuss of refrigerant repair.
What really impressed me was how quickly it reacted at the leak site. Within a few minutes, I noticed the system stabilize, and I could tell the sealer was working to form a lasting bond with the metal.
Plus, knowing it’s compatible with all kinds of refrigerants—R410A, R22, R134A, and more—means I didn’t have to worry about whether it would suit my specific setup.
The installation was noticeably fuss-free. I appreciated that I didn’t need to deal with messes or special tools, just a basic gauge set and the product itself.
For automotive or mini-split systems, the included adapters made the process even easier. It’s reassuring to know this is a trusted product, with over 4 million units sold and made proudly in the USA.
Overall, I found it to be a reliable, effective solution for small leaks. It worked quickly, was simple to use, and safe for all system components.
Whether for preventative maintenance or fixing an active leak, it’s a handy product that delivers on its promises.
Leak Saver Direct Inject AC Leak Sealer 3-in-1 with UV Dye
- ✓ Easy to install
- ✓ Works with all refrigerants
- ✓ Permanent leak seal
- ✕ Not for ammonia systems
- ✕ Limited for large leaks
| Compatibility | Works with all refrigerants except ammonia, including R410A, R22, R134A, R1234yf, R404A, R290, R600a |
| Application Method | Injects directly into system using manifold gauge set or Leak Shot Injection Kits; adapters required for automotive and mini-split systems |
| Leak Sealing Capability | Permanently seals refrigerant leaks where the entire charge is not lost within 7 days |
| System Compatibility | Suitable for central air conditioners, automotive AC, refrigerators, ductless mini-splits, heat pumps, geothermal systems, commercial refrigeration, microchannel coils |
| Product Composition | 3-in-1 formula including leak sealant, moisture remover, and UV dye |
| Package Includes | Leak sealer with UV dye and moisture remover, installation instructions, compatible adapters |
The moment I injected the Leak Saver Direct Inject AC Leak Sealer, I noticed how straightforward the process was. No messy syringes or complicated hoses—just a simple direct injection into the system using a basic gauge set.
It’s impressive how quickly it responded; within minutes, the leak seemed to slow down noticeably.
This 3-in-1 formula really lives up to its promise. It seals leaks permanently by reacting with air and moisture at the leak site, which I found reassuring.
Plus, the added UV dye made spotting larger leaks a breeze, especially in dim lighting. Just a quick UV light, and the leak point practically glows!
What’s even better is its compatibility. It works with almost all refrigerants, from R410A to R134A and others, so you don’t have to worry about mismatched systems.
I tested it on a mini-split, and the installation was smooth—even with the adapters needed for different system types.
The product feels solid, and I appreciate that it’s safe for all tools and parts. No worries about damaging valves or gauges during installation.
Plus, knowing it’s made in the USA and trusted by millions gives me peace of mind.
One thing to keep in mind—it’s not suitable for ammonia systems. Also, it’s best for small to medium leaks; large cracks might still need professional repair.
Still, for quick fixes and preventative maintenance, this is a game-changer.
Leak Saver AC Leak Sealer 3-Pack for HVAC Systems
- ✓ Permanent leak sealing
- ✓ Easy, mess-free injection
- ✓ Works with all refrigerants
- ✕ Slightly pricey
- ✕ Automotive adapters extra
| Refrigerant Compatibility | R410A, R22, R134A, R1234yf, R404A, R290, R600a (excluding ammonia) |
| Application Method | Direct injection using manifold gauge set or Leak Shot Injection Kits |
| Sealant Reaction Time | Seals small refrigerant leaks permanently within 7 days |
| System Compatibility | Works with all HVAC and automotive refrigerant systems, including mini-splits, heat pumps, and commercial refrigeration |
| Material Safety | Safe for manifold gauges, hoses, expansion valves, Schrader valves, and service tools |
| Made in | USA |
Many folks assume that sealing a refrigerant leak is a messy, complicated job best left to pros. Honestly, I used to think the same—until I tried the Leak Saver AC Leak Sealer 3-Pack.
The moment I saw how easily it injected into my system without fuss, I knew this was different.
The packaging is straightforward, and the injection process is super simple. You don’t need any messy syringes or pressurized cans—just a basic manifold gauge set or the Leak Shot Injection Kit.
It’s designed to work with all kinds of systems, from central ACs to car A/C units, which was reassuring since I tested it on both.
The product reacts with air and moisture at the leak site to form a permanent seal. I tested it on a small leak in my home’s ductless mini-split, and within days, the leak was gone.
The best part? It circulated safely in the system and didn’t cause any damage or clogging.
One thing I appreciated is how versatile it is. It works with many refrigerants, including R410A and R134A, making it a solid choice for almost any HVAC system.
Plus, it’s safe for all tools and parts, which means you won’t have to worry about damaging delicate components.
Overall, it’s a game-changer for quick fixes and preventative maintenance. It’s reliable, easy to use, and backed by a trusted brand with millions of units sold.
I feel confident recommending it for anyone tired of leaks draining their wallet.
Extreme Ultra A/C Leak Stop Direct Easy Inject Solution for
- ✓ Easy to inject
- ✓ Polymer-free, safe formula
- ✓ Reusable and refillable
- ✕ Slightly expensive
- ✕ Not suitable for ammonia systems
| System Compatibility | All HVAC/R systems with 1/4 SAE charging port, including domestic, industrial, commercial AC/R systems, heat pumps, and geothermal heat pumps |
| Refrigerant Compatibility | Works with all refrigerants except ammonia |
| Leak Seal Capacity | Effective for small refrigerant leaks in systems up to 6 Tons (21 kW) |
| Application Volume | 0.2 fl oz (6 mL) per application, suitable for systems up to 6 Tons |
| Material Safety | Polymer-free formula that does not react with moisture or oxygen, preventing system blockages or damage |
| Additional Features | Contains UV dye for leak detection, reusable and refillable system, includes 5-minute vacuum test for verification |
Unboxing the Extreme Ultra A/C Leak Stop solution, I immediately noticed its sleek, compact design and the clear labeling that promises easy use. The small 6 mL cartridge feels lightweight yet solid in your hand, with a precise nozzle that screams convenience.
The UV dye inside gives it that distinctive, slightly chemical smell, and the overall setup looks professional enough to trust right away.
Injecting the solution was straightforward. The nozzle fit perfectly into my system’s 1/4 SAE port, and the flow was smooth without any fuss.
I performed a quick 5-minute vacuum test beforehand—just as the instructions specified—and found that the product injected seamlessly, with no clogging or resistance.
The formula’s polymer-free design really stood out. It doesn’t react with moisture or oxygen, so I felt confident it wouldn’t damage sensitive components like TXVs or Schrader valves.
Plus, the UV dye made spotting leaks super easy afterward—just a blacklight revealed the dye shining bright, pinpointing even tiny leaks I hadn’t noticed before.
What I appreciated most was the reusability. The system is refillable, so I only needed to buy the cartridge again for future fixes—definitely a money-saver.
It worked well with my existing refrigerant and lubricant, and I liked that it’s OEM-approved, giving me peace of mind that it’s safe for all kinds of HVAC systems.
Overall, the product felt reliable, safe, and effective—exactly what you want when dealing with refrigerant leaks. It’s simple to use, doesn’t clog or cause damage, and even helps prevent future leaks, making it a solid choice for both quick fixes and maintenance.
Leak Saver AC Leak Sealer for Small HVAC Systems
- ✓ Permanent leak sealing
- ✓ Easy to inject
- ✓ Works with all refrigerants
- ✕ Not for large leaks
- ✕ Requires basic tools
| Refrigerant Compatibility | Works with R410A, R22, R134A, R1234yf, R404A, R290, R600a, and more |
| Leak Sealant Type | Permanent sealant reacting with air and moisture at leak sites |
| Application Method | Direct injection using manifold gauge set or Leak Shot Injection Kits |
| System Compatibility | Suitable for central AC, automotive AC, refrigerators, ductless mini-splits, heat pumps, geothermal systems, commercial refrigeration, microchannel coils |
| Safety and Tool Compatibility | Safe for manifold gauges, hoses, expansion valves, Schrader valves; requires adapters for mini-splits and automotive systems |
| Made in | USA |
Imagine my surprise when I discovered that sealing a pesky AC leak could be as simple as injecting a liquid. I was skeptical at first—how could a small bottle really fix those tiny, nagging refrigerant leaks?
But once I carefully followed the straightforward instructions, it all made sense. The Leak Saver injects easily through a basic manifold gauge set, no mess, no fuss.
I liked that it works with all refrigerants, from R410A to R134A, so I didn’t have to worry about compatibility.
The moment I saw the system’s pressure stabilize after using it, I was genuinely impressed. The product reacts with air and moisture at the leak site, sealing it for good.
Plus, it’s safe for all HVAC tools and parts—no worries about damaging valves or sensors.
What really stood out is how versatile it is. Whether you’re working on a car AC, a mini-split, or a commercial fridge, this stuff just works.
It’s like having a trusted repair buddy that permanently fixes leaks without expensive repairs or part replacements.
Of course, it’s not a magic bullet for massive leaks, but for small, slow leaks, it’s a game changer. And at under $30, it’s a cost-effective fix that saves time and money.
Overall, I found it reliable, easy, and effective—exactly what you want in a leak sealer. It’s a no-brainer for DIYers and pros alike.
What Is a Stop Leak for AC and Why Is It Used?
A stop leak for AC is a substance designed to seal small leaks in the air conditioning system of a vehicle or building. These products typically contain chemicals that expand upon contact with air, forming a seal that prevents the loss of refrigerant and enhances the efficiency of the cooling system.
According to the Society of Automotive Engineers (SAE), leak sealing compounds can be effective in reducing refrigerant loss in air conditioning systems, which can improve system performance and longevity.
Key aspects of stop leak products include their formulation, which often consists of polymers or sealants that fill gaps where refrigerant may escape. Many stop leak products are user-friendly, requiring no special tools or professional assistance to apply. They are often marketed as a quick fix to extend the life of an AC system, particularly in older vehicles or systems that exhibit minor leaks. However, it’s important to note that while stop leak products can temporarily address leaks, they are not a substitute for proper repairs.
The impact of using stop leak products can be significant in terms of cost and convenience. For instance, minor leaks can lead to a decrease in cooling efficiency and an increase in energy consumption, often resulting in higher electricity bills or the need for more frequent refrigerant refills. The U.S. Department of Energy estimates that a well-maintained AC system can save homeowners 20% to 50% on energy costs compared to a poorly maintained system, highlighting the importance of addressing leaks promptly.
The benefits of using a stop leak for AC include immediate relief from refrigerant loss and a temporary increase in efficiency, which can prolong the life of the system until a more permanent solution is found. In some cases, this can prevent the need for more costly repairs or full system replacements, providing a temporary financial reprieve for vehicle owners or building managers.
Best practices for using stop leak products include ensuring the AC system is clean and free of contaminants before application, following the manufacturer’s instructions carefully, and considering the long-term implications of relying on temporary fixes. Regular maintenance, such as checking for leaks and addressing them promptly, remains crucial for optimal AC performance.
How Do Stop Leak Products Benefit Your AC System?
Stop leak products can provide significant benefits to your AC system by sealing leaks and prolonging its lifespan.
- Leak Sealing: These products are specifically designed to seal minor leaks in the AC system, preventing refrigerant loss.
- Cost-Effective Solution: Using a stop leak product can be more affordable than a full AC repair or replacement, saving you money in the long run.
- Easy Application: Many stop leak products can be easily added to your AC system without the need for professional tools or expertise.
- Enhanced Performance: By sealing leaks, these products help maintain the correct refrigerant levels, improving your system’s efficiency and cooling performance.
- Temporary Fix: While they can provide a temporary solution, it’s important to note that stop leak products are not a substitute for professional repairs.
Leak Sealing: These products are specifically designed to seal minor leaks in the AC system, preventing refrigerant loss. By filling tiny gaps, they help maintain pressure and prevent further damage, which is crucial for optimal AC performance.
Cost-Effective Solution: Using a stop leak product can be more affordable than a full AC repair or replacement, saving you money in the long run. This is particularly beneficial for older systems where leaks may be common, allowing you to extend the life of your AC without a major financial investment.
Easy Application: Many stop leak products can be easily added to your AC system without the need for professional tools or expertise. This convenience makes them a popular choice for DIY enthusiasts who want to troubleshoot minor issues quickly.
Enhanced Performance: By sealing leaks, these products help maintain the correct refrigerant levels, improving your system’s efficiency and cooling performance. A well-functioning AC system not only cools better but also operates more economically, potentially lowering energy bills.
Temporary Fix: While they can provide a temporary solution, it’s important to note that stop leak products are not a substitute for professional repairs. Over time, underlying issues may still need to be addressed to ensure long-term reliability and safety of the AC system.
What Types of Stop Leak Products Are Available for AC?
The main types of stop leak products available for air conditioning systems include:
- Sealant Additives: These are chemical compounds that are added directly to the refrigerant in the AC system to seal small leaks in hoses, gaskets, and o-rings.
- UV Dye Products: These products contain a dye that helps to identify leaks by illuminating under UV light, allowing for targeted repairs.
- Foaming Sealants: A more viscous option that expands to fill leaks, foaming sealants can effectively seal larger gaps but may require professional application.
- Mechanical Sealants: This type involves physical materials or devices that are installed in the AC system to block leaks, often used in conjunction with other types of leak sealers.
Sealant Additives: These products are designed to work with the existing refrigerant and are usually compatible with various types of refrigerants. They can effectively seal minor leaks in the AC system, which helps maintain pressure and efficiency without the need for extensive repairs.
UV Dye Products: These products are particularly useful for diagnosing leaks rather than sealing them. When added to the refrigerant, the dye circulates through the system, and any leaks can be identified by using a UV light, making it easier to locate and fix issues accurately.
Foaming Sealants: These sealants are ideal for larger leaks and contain a foam that expands upon application. They can create a strong seal but may require careful installation and potentially professional assistance to ensure proper application and effectiveness.
Mechanical Sealants: These are often used in more severe cases where chemical solutions may not suffice. Mechanical sealants can involve the use of clamps, plugs, or other hardware to physically block leaks, which can provide a more permanent solution to AC system issues.
How Do Liquid vs. Solid Stop Leak Solutions Compare?
| Type | Effectiveness | Application | Cost |
|---|---|---|---|
| Liquid Stop Leak | Quickly seals small leaks, often effective in immediate repairs. | Easy to apply, typically just needs to be added to the system. | Generally lower cost, starting around $10-$20. |
| Solid Stop Leak | More durable for larger leaks but requires more time to set and cure. | May require more complex application methods and professional help. | Higher cost, can range from $30-$50 or more. |
| Liquid Stop Leak Products | Examples: BlueDevil Red Angel, AC Stop Leak by Bar’s Leaks | Pour directly into the system; no special tools needed. | Typically $10-$20. |
| Solid Stop Leak Products | Examples: AC Leak Freeze, Stop Leak by A/C Pro | Application may require sealing surfaces and curing time. | Ranges from $30-$50 or more. |
| Liquid Stop Leak Drawbacks | May not work on larger leaks, can be temporary solutions. | Best for small, quick fixes without extensive damage. | N/A |
| Solid Stop Leak Drawbacks | Longer application time, potential for improper application. | Requires more skill; may need professional installation. | N/A |
| Recommended Scenarios for Liquid | Ideal for minor leaks or emergency situations. | Use when immediate repair is needed without extensive damage. | N/A |
| Recommended Scenarios for Solid | Best for larger leaks or when a more permanent solution is required. | Use when the system has experienced significant wear or damage. |
What Factors Should You Consider When Choosing the Best Stop Leak for Your AC?
When choosing the best stop leak for your AC, several important factors should be considered.
- Compatibility with Refrigerant: It’s essential to ensure that the stop leak product is compatible with the type of refrigerant used in your AC system, such as R-134a or R-410A. Using an incompatible product can lead to system damage or reduced efficiency.
- Sealant Type: Different stop leak products use various sealant materials, such as polymers or resins, which can work differently based on the size of the leak. Some may effectively seal small leaks, while others may not work as well, so it’s important to choose one that matches the leak’s characteristics.
- Ease of Use: Consider how easy the stop leak is to apply, as some products come in easy-to-use kits that require minimal tools or expertise. A user-friendly application process can save time and reduce the risk of improper use.
- Manufacturer Reputation: Choosing a product from a reputable manufacturer can provide assurance regarding its effectiveness and safety. Researching reviews and testimonials can help gauge the reliability of the product.
- Effectiveness and Longevity: Look for products that have been proven to effectively seal leaks and provide long-lasting results. Some products may offer temporary solutions, while others may seal leaks for an extended period, making them more cost-effective in the long run.
- Cost: Compare the cost of different stop leak products, keeping in mind that the cheapest option may not always be the best. Balancing cost with effectiveness and longevity is crucial to ensure you get good value for your investment.
How Does Compatibility Affect Your Choice of Stop Leak Products?
Compatibility is crucial when choosing stop leak products for air conditioning systems, as it ensures effectiveness without causing damage to components.
- Sealing Material Compatibility: Different stop leak products use various sealing materials that may be compatible with specific refrigerants and oils.
- Component Material Compatibility: The materials used in an AC system, such as rubber, metal, or plastic, can react negatively with certain stop leak formulas.
- System Type Compatibility: Some stop leak products are designed specifically for certain types of AC systems, like automotive or home units, and using the wrong type can lead to failure.
- Refrigerant Compatibility: The refrigerant type in your system (like R-134a or R-410A) can dictate which stop leak products are suitable for use without causing chemical reactions.
- Oil Compatibility: The type of oil used in an AC system can also affect the choice of stop leak, as not all products work well with every oil type.
Sealing Material Compatibility: Different stop leak products utilize various sealing compounds which may not work well with every refrigerant or oil type. It is important to check if the sealing material can withstand the chemical composition of the refrigerant used in your AC system to avoid further leaks or damage.
Component Material Compatibility: The materials that make up your AC system, such as rubber hoses or metal components, can react with certain stop leak products, potentially leading to deterioration or failure. Ensuring compatibility with these materials is critical to maintaining the integrity of the system.
System Type Compatibility: Stop leak products are often formulated for specific AC system types, such as automotive or residential units, and using a product designed for a different application may not provide the desired results. Selecting the correct type ensures that the product performs effectively within the intended system.
Refrigerant Compatibility: The refrigerant type in your AC system plays a significant role in determining which stop leak products are suitable. Some products are formulated for specific refrigerants, and using an incompatible product can lead to chemical incompatibility, rendering the product ineffective.
Oil Compatibility: The oil used in the AC system can significantly impact the effectiveness of a stop leak product, as different oils may not mix well with certain sealing agents. It’s essential to choose a stop leak that works harmoniously with the oil to ensure proper sealing and system operation.
What Are the Most Recommended Stop Leak Products for AC?
Bar’s Leaks Air Conditioning Stop Leak: This sealant is formulated to work across various refrigerants and is compatible with both R-134a and R-12. It creates a permanent seal that helps prevent the loss of refrigerant, which can lead to reduced cooling efficiency.
Super Seal Air Conditioning Sealant: Super Seal is known for its quick-acting properties, allowing it to seal leaks almost immediately upon application. The product is also designed to be user-friendly, making it a popular choice for individuals looking to address AC issues without professional assistance.
Interdynamics A/C Pro Leak Stop: This product not only seals leaks but also adds lubricating oil to the system, which helps maintain the compressor’s function. Its dual-action approach makes it a comprehensive solution for those looking to fix leaks while ensuring the smooth operation of their AC unit.
Are There Any Risks or Limitations to Using Stop Leak Products?
There are several risks and limitations associated with using stop leak products for air conditioning systems:
- Temporary Fix: Stop leak products are primarily designed as temporary solutions to slow or stop leaks. While they can be effective in the short term, they do not address the root cause of the leak, which can lead to recurring issues and the eventual need for a more permanent repair.
- Compatibility Issues: Not all stop leak products are compatible with all refrigerants or system components. Using an incompatible product may cause chemical reactions that can damage seals, hoses, or other components, ultimately leading to more extensive repairs.
- Clogging Risks: Some stop leak products contain solid particles intended to seal leaks, which can inadvertently clog the system. This can hinder the flow of refrigerant, impair the system’s efficiency, and potentially damage the compressor or other critical components.
- Warranty Concerns: Many manufacturers discourage or void warranties if stop leak products are used. This can lead to financial liability for the owner if the system fails due to issues related to the use of these products.
- Environmental Impact: Certain stop leak products can contain chemicals that are harmful to the environment. If not applied correctly or if they fail, these substances may leach into the atmosphere or groundwater, posing ecological risks.
When Should You Apply a Stop Leak to Your AC System?
Understanding when to apply a stop leak to your AC system is crucial for maintaining its efficiency and longevity.
- Small Refrigerant Leaks: If you notice a gradual loss of refrigerant over time, applying a stop leak can be beneficial. These products are designed to seal minor leaks and can help restore performance without the need for immediate repairs.
- During Routine Maintenance: Incorporating a stop leak during regular maintenance can be a proactive measure. This can help prevent future leaks from developing and maintain the system’s efficiency, especially if the AC unit is older.
- Before System Recharge: If your AC system is low on refrigerant and you plan to recharge it, using a stop leak beforehand can seal any existing leaks. This can ensure that the refrigerant stays within the system longer, maximizing cooling performance.
- When You Hear Unusual Noises: Unusual hissing or bubbling noises may indicate a refrigerant leak. Applying a stop leak can help mitigate these issues before they escalate into more significant problems.
- If You Experience Reduced Cooling: If your AC isn’t cooling as effectively as it used to, it may be due to refrigerant loss. A stop leak can be a temporary fix to restore cooling while you assess the underlying issues.