Updated June 12, 2019 by Quincy Miller

The 10 Best AC Leak Stoppers

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This wiki has been updated 12 times since it was first published in June of 2016. Calling out an appliance repair person is expensive, so it may behoove you to try one of these AC leak stoppers first if your unit is giving you problems. They can deliver an instant and economical fix for many car and household air conditioning issues. Just be sure you know what you're doing before trying to use any of these, however, as escaping refrigerant can be hazardous to your health. When users buy our independently chosen editorial selections, we may earn commissions to help fund the Wiki. Skip to the best ac leak stopper on Amazon.

10. BlueDevil Products Red Angel

9. Interdynamics AC PRO MRL-3

8. AC Leak Freeze 00284

7. Cliplight Super Seal Advanced 944KIT

6. Red Tek ProSeal22

5. FJC 9140 Stop Leak

4. Nu-Calgon A/C Easy Seal

3. Interdynamics A/C PRO ACP-105

2. Interdynamics High Mileage

1. Leak Savers Direct Inject

Editor's Notes

May 24, 2019:

Not every option listed here is suitable for both home and auto use, so make sure to double-check that whichever one you're considering is suitable for your intended application before buying. Likewise, while most are universally compatible with refrigerants and oils, that's something you should be absolutely certain of before installation.

The method of installation should also be carefully considered. Some can screw directly into your system, while others require a connection hose (which may or may not be provided — Red Tek ProSeal22 requires you to supply your own, for example).

Beyond that, there are a variety of features that you should think about. One important consideration is whether you want the sealant to mix with the oil; the advantage to this is that it's certain to form a seal, while the danger is that it might solidify prematurely, causing a clog that derails your whole system. Nu-Calgon A/C Easy Seal is one of the few that doesn't mix with the oil, if that's your preference.


Quincy Miller
Last updated on June 12, 2019 by Quincy Miller

After getting his bachelor’s from the University of Texas, Quincy Miller moved out to Los Angeles, where he soon found work as a copywriter and researcher, specializing in health and wellness topics for a major online media brand. Quincy is also knowledgeable about home improvement, as he’s had extensive experience with everything from insulation to power tools to emergency room trips, sometimes in that order. Sharing a home with three dogs and a couple of cats has forced Quincy to learn as much as he can about pet supplies, animal nutrition and, most importantly, the best ways to tackle the mountains of fur that accumulate in every corner of your home.


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