I have a hole in my evaporator. As a result, after a few months of charging up the AC (it's R134a), it will blow cool but not cold. I have no interest in replacing the evaporator, both due to the cost and the invasiveness of the repair. So, I was thinking about trying an AC sealant.

I found interesting info at

http://aircondition.com/knowledge_base/LeakSealers.html

Has anyone had any experience in doing this? Any preferred methods/brands? Anything to watch out for/downsides?

Thanks!

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I would certainly install a good inline filter immediately upstream ( suction side ) of your compressor before you try anything which claims to seal holes...
I hope that it works.. but really doubt that it will...

All these products react with moisture.
When you open your system after adding this stuff it could cause clogs and restrictions.
Furthermore mechanics use "sniffers" to detect sealants and either will not touch it or will kill you in cost.

I know you don't want to replace the evaporator. You may even get away with it. But you need to know your taking a risk. This could cause you a lot more money in the long run replacing the condenser, liquid lines, etc...

Danny

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It will also cause the poor shop that ends up working on the thing after the sealant doesn't work to have hundreds of thousands of dollars worth of damage to their recovery/recycle equipment. The guys in the shop are just trying to pay their bills and buy shoes for the baby just like everyone else. Please don't do this to them.

It also will likely destroy the ENTIRE system. Now you have a bad evaporator. After using this snake oil you will have an ENTIRE system that will be ruined.

Replacing an evaporator is a big job, but not impossible. Get the manuals, take your time and you can do it.

Good luck,