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Henry C.
2025-09-05 10:16:47
There's not much more I can say about a product that truly works. I replaced my outdoor compressor with R407C, a direct replacement for old R22 system. The coil was in the attic and almost impossible to reach comfortably. It is 25 + years old. This year, I was losing pressure, so I gave this a try. BOOM ! leak stopped immediately. I added more gas and at 90 degrees out, I'm pushing 68 indoors.Contrary to HVAC guys, this product works and at $37 a squirt, any other conversation is used car talk !And so simple to do, I bought 2 more for other systems I have. TRY THIS FIRST, SAVE THE BS
Lobusmaximus
2025-08-12 14:36:15
I'd been trying to locate a small Freon leak with soap sprays, oil residue searches, & Freon sniffers on the 7-year old split unit heat pump in my shop. It would run for 4 to 5 months of cooling & heating, then suddenly shut down with low pressure indicated. It tended to run longer cooling than when heating. I was leary of stop-leak products in general because of bad experiences in car systems; the stuff plugged up everything (like thermostats) as well as the intended target. The R-410A systems run at very high pressures compared to old R-22 systems so I expected to find a fitting not quite tight enough to hold the refrigerant. No luck. I viewed the clear tubing holding the stop leak & UV dye with suspicion--didn't look strong enough to hold the high pressure. The connectors fit perfectly (I already had the adapter on the low-pressure line needed to connect the low-pressure hose); they were just like an extension of the charging hose. I decided to do the injection & recharge in one go. I set up liquid injection into the low-pressure line to make sure the contents were diluted promptly. When I opened the tank charging valve the yellow fluid in the clear tubing vanished immediately followed by boiling R-410A. I watched while the scales moved smoothly up to the 68.8 oz charging spec with the system running on cooling. Everything worked fine for about an hour then the system shut down. Turned out there was more residual R-410A than I expected & the system stopped (high pressure cutoff) when the fluid temperature came up to the 100 deg F outside temperature. I decided to let the system pressure equalize--give the leak a chance to expel some of the stop leak fluid. Air & moisture was suppose to cause it to harden & plug the leak. Sure enough, the next day the AC came on & the air coming out of the evaporator was a chilly 50 deg F. It has worked great both as a heat pump & AC since then. I haven't tried to located my UV light to see if any dye escaped. I expect that will be easier to find if significant R-410A escapes in a few months. Follow the instructions; I recommend this for small leaks--don't waste R-410A (or any other refrigerants) trying to plug large leaks. The dye-only version is probably your best approach in that case.
JK in VA
2025-08-01 11:33:33
This is the second batch of Refrigerant Leak Sealers that I've used. I was losing a lot of freon from 2 systems. The initial treatments stopped the leaks almost completely. After a couple of years, one system started to leak a little. Another treatment stopped that as well. Now it's several years later and another treatment has boths systems working great and leak-free. The HVAC company charges $100-$150 per treatment for a very similar product. My builder-grade AC systems are almost 20 years old. Ours is the only home in our development that hasn't had to replace the AC systems. You do need a a basic manifold gauge set or injection kit, but it's simple to use.
twinsmom
2025-06-30 12:37:49
After reading reviews I thought I’d give it a try. HVAC guys said system was shot. Not bad for 26 years of use though. Followed directions and left system run for over an hour after injection and refilling. Air coming out of vents read 58 degrees. Later it read 65 degrees and next day was 72. Couldn’t find leak with uv light but didn’t have full access to everything. It was worth the try. It just didn’t work for me.
Robert
2025-06-27 13:59:37
I tried this on two mini splits that had slow leaks before I found Nylog. The first seems okay.The second one must have had bad product. It was a 2 year old system that was a little low. I shot in this leak saver and it was very slow going in and made a farting sound. Much different than the first one I used. The gas was very slow going in. Unit ran for about a half hour and the compressor started making a loud banging sound every few minutes. The sound kept getting worse. By the next morning it was making a grinding sound and was working poorly. I know when you disconnect service hoses you will get some splash as found on the first unit with UV. The second unit that had the problem showed small bits of solid yellow under UV. Not splash. I disassembled the system and shined UV in the lines. I got NO UV indication in the lines. That means the Dye/ leak saver must have been solid upon install. If it was liquid it should have been distributed through the whole system after a few hours running.The unit is trashed and I had to buy a replacement so now I am out the 30 bucks spent on this product, 600 for a new unit and some expensive R410A. Plus labor and parts to fix the wall. I figure good luck getting anything back from leak saver and am not going to waste my time.STAY AWAY FROM THIS PRODUCT!!!!!
Eric
2025-05-24 18:50:23
Had a leak last year. Used this after refilling to try to last for another summer and so far it held up a year later! I have stopped using the heating cycle to prevent useless thermal stress and extend it as far as possible.I tried to cheap out buying this and a manual pump and adapters and whatnot. TLDR: Don't cheap out and get the Co2 injector too.
Hussain
2025-04-16 18:48:18
It does not work
Philip Smith Customer
2025-04-08 12:56:03
Worked as sold. Easy to install
jeff yiu
2025-03-20 17:13:37
Had small leak and this solved the problem
T Pedibone
2025-02-03 14:14:11
didnt work for me!
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