TSI Supercool 28399 HVAC Leak Stop Syringe with Application Hose, 2 fl. oz. (60 mL)

Long story short, this product is so much easier to inject using an HVAC dye injector. A nice metal one is available for $30 on Amazon. I have no idea why it doesn't ship with one or that the manufacturer doesn't recommend it. They really should! The syringe it comes with sits near the edge of structural failure and needs modifications to even work! Short story long, my uncle fixes people's HVAC on the side for cheap. He swears by this stuff as the first response to slow leaks. However, the directions/videos on how to use this product are a joke. They show technicians just injecting the stuff easily and quickly in 30 seconds. This is not going to happen if you use the syringe. The pressure inside an R410a system is near 150 PSI. For me to use the syringe, I had to first stop the plunger from bending by sticking pieces of extra plastic around it so it would not bend. I had to use a washer on the front to stop the caulk gun from destroying the syringe front. Then I needed an extra clamp to help close and hold the caulk gun handle. Even then, I could only inject about a hair's width worth every 5 minutes. If I clamped it and let it sit, the system would eventually pull some out of the syringe, and I could repeat this. Before I could get this to work, the check valves were both locked up. I had to extend the Schrader valve trigger on the front valve and poke out the rear check valve because the tubing had excessive pressure that had them locked up. This was extremely dangerous. When it release it sounded like a gunshot and sent the Allen wrench I poked it with flying out of sight. I nearly got a hydraulic injection wound from a stream of this blue stuff! Do not try this! Once I was able to get the blue stuff flowing again, the issue was that the syringe would always come loose because it only needs one turn to start leaking, so about 3/4 of the product ended up on the ground as I messed with it. I ordered another tube because they are only $20. I also ordered a metal HVAC dye injector for $32 off Amazon. It just opened it all the way, squirted the blue stuff in, closed it, and bled out the air until blue came out the tube end. I connected it and turned it a half turn every 10-15 seconds until it was empty. So much easier, no waste, and much safer! Please just spend the extra money to inject this, especially if it has a chance of working. $55 is much cheaper than $500 or $5000.

I was getting ready to sell my house and had just replaced the downstairs outside A/C unit. $3000. 2 weeks before sale, I got a leak in my HVAC. Had an HVAC tech come out and service it, he thought it just needed freon. Took less than 2 days for all that to leak out and downstairs ceased cooling again. Had him come out again and he said it would be another $3000 to replace the HVAC. I wasn't trying to pay 3 grand so the next owners of my house could be super comfortable so I searched and found this product. Followed the directions to a tee and within a few hours, the downstairs unit was holding steady at 69 degrees and is still working fine to this day according to the new owners. Total lifesaver and easy on the wallet.

I've used this product twice now. Let me just say garbage plastic please redesign this looked very bad when my customer was watching me. Finished the pump down and then the plunger snaps in half with little effort 😕 Theeennnnvit wouldn't go into the unit! So I had to fill my hoses with it and open my gauges to inject the system. Running tho was a tiny micro leak plan to check next year to see if it lasts

I read the instructions and the reviews and agree that it would be impossible to inject into a pressurized system. I tried it…and could not get it to flow. I then used my recovery machine to pump the Freon out of one of my shorter lines and send it to the ac unit collection tank. Once my line was at a vacuume, I tried to inject the fluid. It injected into a vacuume line but took a lot of effort to flow it. But got it done. Once I had the fluid in the line…I left the line closed off and turned my unit on in heat mode. As the unit ran, i slowly opened the line valves to put pressure back into the lines. Very slowly so I would not stall the ac motor. Once the line I injected was fully open, I ran the unit in heat mode for 15 minutes to circulate the fluid across 5 lines totaling 200 ft. Then I let it run in cooling mode for 30 minutes. After that..I rechecked my system using a leak gas analyzer and the very slow leak I had which prompted me to buy this product was gone. Don’t know how long the leak fix will last but at least I can get thru the summer with out having to dismantle, reflate, re nylock , retorque connections. Plan to put in it heat mode for a few minutes every day over the next week to make sure my reversing valve does not have problems. My advice is if you don’t have a recovery machine to move Freon out of one line , you should watch a few YouTube videos about how to pump down your system. Pump down lets you move Freon out of the lines and back into the ac unit. Pump down works well on systems with short to medium line lengths. I have 200 ft do pump down will not work for me. Also, don’t forget to reopen slowly the cakes you used to pump down your system.

Used this as a stop-gap until I could have the HVAC system replaced. A real pain - very difficult to inject with a caulking gun and the syringe tip broke off after most of the sealant was injected making a mess, but a year later the system seams to be cooling just as well as it did after the recharge and sealant injection.

I have seen lot of comments for this product and the only thing i can say it does work for me. I had a leak on my ac coil and after injecting this product by following the instruction, now the leak is gone. I don't know how long it will hold but for now it is working fine. It is been working fine for the past week.

My father (an HVAC tech) says this is the most difficult leak seal product he has ever used. We bought this to fix a leak in my 2010 R-22 American Standard (Trane) system. According to my dad, All I had to do was connect it to the low pressure side and "it should just suck it down". This was not the case. There seems to be a one way valve in the end of the hose that connects to the syringe. It seems to have been stuck. I had to stick a long thin rod into that end of the hose, and force it open, then connect to the syringe, fill the hose with sealant, then connect to the low pressure port. Even after all that, I was only able to push 1/10 of the tube into the system before I had to put it into a caulk gun, and right before the last 1/10 of the tube went in the syringe blew out from the stress (see picture).

HVAC guy told me I had a leak in the coil and I was hopeful this would work and I could get through the summer. But unfortunately this product did not help. I am buying a new coil. Everything was easy enough to DIY and add to the system. I did have to use a caulking gun to force the liquid into the system. Remember if you are low on refrigerant and then you do this, you will need to recharge the system. If it does not work then the cost of the recharge is out the window with the cost of the sealant!! Recharge is about $100 per pound. I added 3 pounds to a 6 lb system so I had a decent leak and it was a $330 trial and error--not in my favor this time.