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Totally agree on the leak detectors. If I check an evap. coil, I usually pump the system down outside and pump the indoor up with nitrogen to about 350 psi. Most are factory tested higher than that (400-450) Then you can use leak detector (gas) that has a tendency to be bright yellow and you can...

Well if the unit is apparently older, then how could blower speed be a problem? If it works for years before then something beside blower speed could be the problem. There are several other things I would check before cfm on a blower. 1. Even though you change filters doesn't always mean your...

I would have to look that one up but in my 20+ years as a tech. i've never seen a furnace temp. so hot that it burns the plastic on an evap. coil. There should have high temperature limits inside the furnace that will protect the coils

I would check on the warranty of the coils. If the system is only 8 years old it is possible, if registered, the coils have a 10 year warranty. Granted this system is probably R-22 system and you cannot purchase anymore R-22 systems, you should still be able to get a coil. 8 years old is awful...