Capacitors used to be filled with pcb's and seldom went bad. Now their filled with dialectricts (Can't spell) and yes they over heat. Most generally are the systems that are overcharged. Yes lennox caps. go bad but what about bryants?
I'm sure everyone here knows how to take 2-3 or more capacitors and wire them to get a certain mfd. reading.
its ok to replace a 370vac cap with a 440vac cap but never the other way!!! Also all Lennox require 440vac.
If you combine say a 35mfd with a 10 mfd to get a 45 mfd. do it in parrell and make sure they are both the same vac!
Its got to be how the capacitors are made today that causes all the excessive failure rates. No different than copper evaporator coils corroding out after a few years. The manufacturers tell us its the heat that causes the caps to fail & the
chemicals in homes causes the copper to corrode. If you ever look at the size of the old capacitors that rarely ever went bad & compare them to the modern no pcb caps its laughable. They wouldn't even fit in the cabinets. The heat that is the major cause of failures today never seemed to bother the old ones. I guess it never got hot 20 years ago.
An engineer designs what he would never work on.
A technician works on what he would never design.