Not sure what the technical cause of the failure is but all you really need to know is that the AC evaporator leaks over time and the AC performance will degrade until it stops working entirely.I need to make a decision on an extended warranty soon and want to know what exactly fails on these units. Bad solder joints, for instance? Should I worry if the A/C is only used occasionally? Thanks.
The average cost for an evaporator replacement is about $2000. You just have to ask yourself if you can stomach that repair bill outside of a warranty or if you can live without AC if it does fail.
There is another thread where people have stated they've had no issues with their original evaporator but I'm on my third and I don't even use the AC year-round.