Diversitech Master Care Leak Armor, HVAC/R Leak Sealant 2oz Permanently Seals and Prevents Leaks in A/C and Refrigeration Systems from 1.5 to 5 Tons

UPDATE: After 2 years, my AC system is still running strong. I have not had to add R22 this year, and I have had zero problems with my air conditioner. Whatever small leak I had was definitely fixed by this product.Easy to install, if you follow the directions and understand how your split AC system works. Like most people here, I had a slow Freon leak that meant every 2-3 years my air conditioner would ice up despite my filter and coils being clean. My dad owned an HVAC company and as a kid I worked with him, so I have a basic understanding of how a split system works, and I can always call him for tech support. Let me just tell you, that if you call an HVAC tech to charge your AC, they are obligated to find your leak first, and try to repair it. Depending on your installation, this could take hours (at $100+ per hour), and they might not find your leak. There are many reasons why they might not find your leak. You could have a microscopic leak that leaks very slowly at a fitting or at the Schrader valve at your charging port only when it is very cold outside. In the summer months with the AC running, the leak my be very small due to the expansion of the copper tubing or rubber O-rings. Additionally, your refrigerant (R22 in my case) carries oil with it throughout the system to lubricate the compressor. Your leak may be small enough that when the compressor is running and the oil is circulating, it will plug the leak. When the compressor stops, it starts to leak slowly under a lower pressure that may be difficult for a sniffer to find. UV dyes work well, but you have to be able to trace all of your copper supply lines from the condenser to the coil. That is time consuming (at $100+ an hour) and difficult if you have a finished basement or an installation where your lines are in a place that is difficult to see.What's an HVAC tech to do? He is obligated to stop you from discharging R22 into the atmosphere. He has a stack of customers waiting for him to get their AC back up and running, and they are all as desperate as you. He's got a family to feed and a business to run. If you have an older R22 unit, he's probably going to recommend that you replace it along with your furnace. He's not trying to rip you off, but he's trying to do what's best for you in the long term. You will be shocked by the bill. A new unit is expensive, R22 now costs over $23 a pound a wholesale, and you have to be licensed to buy it. There are many people and government regulations to blame for that, but it's not your HVAC guy's fault. A quality new 5 ton unit for my house with a higher SEER rating will cost me $7000 at Wholesale cost with me and my dad doing the installation ourselves. Where I live, we run our AC 3-4 months a year. If you go to the DOE website, you will see that for me there will NEVER be a payoff in terms of money saved in efficiency vs installation costs of a high SEER unit over the course of it's expected lifetime.What to do? If you have access to refrigeration gauges and R22, you need to charge your system to it's appropriate level. Once you have done that, you follow the directions that come with this kits (and watch the videos). Make sure you purge the line and charge this can properly. Install this can and run your system for at least 10 minutes (my dad said let it run for at least a half an hour). I know that some people have said that they experienced a compressor lock up after installation. I don't know why this would have happened as a result of this product, if your system was properly charged and you installed it according to the directions. I installed this product two weeks ago and my AC is blowing nice and cold. My leak was so slow that it will be another year or two before I am able to determine how well this stuff seals leaks. I will probably end up replacing my system in the next few years, but in the meantime, my AC is still working great and it only cost me a couple hundred dollars including the R22.

My ac unit needs 1-2 pounds added every year and my ac guy wanted to charge me $350 to add this to my ac system. These ac local guys are complete ripoffs. There are honest guys out there, but seriously, I sent him on his way and bought this, following the instructions, turn the ac unit off and leave off about 15 minutes. Then take what you have been sent in this kit out to the outside unit and locate the low side screw fiting. Remove the cap covering it, attach the hose to the can. Tighten. Then screw on the hose with the can attached to your low side fitting. Tighten. Now you need to bleed the air in the line to the top of the can so loosen the hose to the can and your ac unit will vent out. You only need to do this for a second to purge the air out of the line you attached. Tighten back quickly. Leave the can upright and turn the t handle in to pierce the can and then open the t handle to allow the ac unit to charge up the can. You'll hear the refrigerant from your ac system go in the can. (The kit doesn't add refrigerant so ignore the ac guy who tells you to leave this to the professionals, your only adding uv dye and leak sealant only). Once the refrigerant entering the can noise is gone. Turn the t handle clockwise to seal off the can again. Go back inside and turn on the ac unit. Set it cold because you want to run it a minimum of 10 minutes. Go back to Your can, flip it upside down, then open the t handle again allowing the sealant to escape in your ac system. It's yellow in color, and the clear line will turn yellow as it flows out. After 5 minutes to 15 min you'll see the line turning clear again. Once you see this close the t handle clockwise again and remove the line from your ac unit. If Your can still has sealant, you'll have to repeat. If you've done this 3-4 times and it's not taking the sealant, you have more problems then a leak. Could be Freon too low, compressor, ac refrigerant filter clogged, or kink in your refrigerant lines. Good luck. Good hvac guys who won't rip you off are hard to find...

It worked! Both A/C units working all summer long after we were told replacement was inevitable. It was easy to install. Called the A/C guys in to charge my units that had already leaked out from last fall. Installed in less than ten minutes after they pulled out of my driveway! Saved myself over $25K+ in replacement costs on two 4 ton units and an exchanger 3 stories up. Let alone the price of freon which is now astronomical. Costed me $700 last year to get my units recharged and no more iced up exchngers! Thank goodness! Still operating a 30+ year old Rheem unit and a 15+ year old Carrier. Only problem is now I'll keep these old less efficient units operating longer instead of upgrading to something quieter and more efficient. I guess now I can do it when I choose to do it. When I do install new ones I can add this as insurance to protect against any future leaks! Protect against spending $ on recharges and waiting in the heat for a repairman down the road! I am very happy with the results!

Did not plug freon leak but caused the TXP valve to fail.about 6 months after Cliplight was installed. Unit was a Trane 5 ton heat pump.about 8-9 years old. I live in Florida. AC guy wanted @ 2000.00 to replace the TXP valve so put in a whole new AC/heat pump system..