Product review (5 stars): but so far I'm happy.
I had a buzzing noise coming from an outdoor Trane Air condition unit.  The unit also releases steam when it is on. I was told the unit is under defreezing process, but that was incorrect explanation. I turn off and look for solutions online. I end up watching a YouTube video from a gentleman in Taxes who has an exact problem I'm having and suggested a simple fix.  The problem was capacitor, I ordered two from Amazon and took me 10 minutes to replace it.  That is it, I  have one extra as a backup.  Too early to write a product review, but so far I'm happy.