Pinhole in A-Coil in home HVAC just 1 year old

[Matthew Dodrill]

I have an issue with an A-coil it took a little over a year for the Freon to empty out. it was determined that their is a pinhole.  I have had 2 HVAC companies come and look, both want to replace the A-coil.  The whole system is just over 1 yr old.  My question is can I put in a coolant sealer in the line the same as what they put in cars in the home AC line?   No one will answer the question here. I only get its "too hard to solder the aluminum" when I start asking about putting nitrogen gas in the line before soldering.