Leak Saver Direct Inject Small System with UV Dye - Refrigerant Leak Sealer - Detects Large Leaks - Ideal for Most Small Home Appliances and HVAC Systems up to 1 Ton - Proudly Made in The USA

Two years ago my 19 year old Lennox a/c would not turn on. Service technician had to add 6+ lbs of r410a refrigerant. We discussed getting a new system. Two months later it was not cooling as well and required another 3 lbs. $1,300 for service calls but I got through the summer.Over the winter my furnace died so a few months later I was not ready to spend another 10k for new a/c system.As a DIY guy I educated myself with YouTube videos.I bought this sealer and charged the system myself.Had a very respectable 20 degree delta T which it maintained all summer.This spring we had a couple of 80 degree days with really cool nights so a/c wasn’t needed but I decided to check the system. Hoped for the best but expected to be disappointed.I hooked up my gauges and was pleasantly surprised to find everything was good.I am very pleased and impressed.Thank you for keeping me cool and buying me some time.

You have to be handy to use this, and it is difficult to get it to inject into your system, but a week out from using it we appear to be holding temperature. Since our only other option was replacing a $10,000 sub zero fridge from 1997 this seemed like a good “Hail Mary”. I recommend that you only use it in cases where the only other option is to throw the appliance away however. The better approach is to properly fix the leak. For us it just wasn’t worth pouring a big sum into a 25 year old appliance.

Works as agreed

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.

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!!!!!

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.

Updated to five stars. I had a batch with bad depressors for the access valves and the product didn’t get into the system. The manufacturer made it right and that’s cool. I’ve used quite a few of these and have had great odds with it.

I injected this into the heat pump and ran it a few days, but the refrigerant went empty. I pulled unit apart and found leak. It was pretty big. I ended up just brazing the whole shut. Sensor clamp rubbed a hole in the lineset. Everything good now. I have used these in the past, and they have worked. I do hvac for a living.