TSI Supercool 39241B-YF Total Leak Stop and U/V Dye

Dye is highly visible and I was able to rapidly pinpoint the leak in my AC system. Worked like a champ. I am highly pleased. Please remember that you should not cross contaminate different coolant types. This one is for R-1234yf

I was pretty skeptical but after $3000 in repairs and trips to fours different mechanics (two dealers and two independents) this little can fixed my air leak. My 1234xy would last 2-3 weeks before. Now it is going on 9 weeks and is still going. Worth it and bought another.

The quick connection is garbage and will not have a complete seal. Now I can't tell the difference from what is a leak or the explosion of dye from the poor quality connection. I had to press down on the connector to maintain a seal in order to put it into the system.

This product was a life saver. Highly recommend

I tried using this on a 2017 BMW 540 that needed to have it's A/C recharged twice last summer. The quick connector that attaches to the low pressure port seems really cheaply made (it's plastic) and is difficult to attach. I thought that it was broken but eventually got it on... I think. One tip is to try to rotate the connector and try different positions on the low pressure port. Another tip is that your A/C compressure MUST BE RUNNING! I had to add just a little bit of refrigerant til my compressor kicked on, then I added the stop leak, then I added the rest of the refrigerant. Since there's only 1oz of product, it's difficult to determine how much product goes in or should still remain in the tube. The directions could use some clarification. However, I believe that some product did make it in, but only time will tell.