When to replace 30 year old A/C

[JerryC]

Spectroline dye for HVAC will not wash off with water. No way, no how.

I don't know what it was. They looked for it with a certain kind of light (blacklight, UV?) and there was none to be found. The coil looked new after ~3.5 years when they took it out. They covered it under warranty I didn't pay a cent for it, or the recharges they did since the new unit was installed.

 

[LS6 Tommy]

There have been quite a few times I used U/V dyes and found no traces of leaks on systems that were pretty porous. That doesn't mean I think dyes are no good...

Tommy