On our A/C, we had about 80-90% of the underside of the "evaporator unit coils" covered with the jelly/mold/scum, which must've accumulated just recently, as the condensate drain had backed up (I hadn't flushed it nor run vinegar thru it this year, to keep it clear). I'm marking the calendar to inspect and clean every month when I change the filters.

I have been inspecting and cleaning the exterior "condensing unit" already, vacuuming the fins, then flushing them using the same Simple Green cleaner that I used on the evaporator unit ( but not this year, since I ran out of the cleaner). I had to take the metal cover off the unit two or three years ago, after the exterior had gotten covered with so many feathers that vacuuming itself wouldn't free them from the surface thru the metal cover. Too many free-range chickens had nested under the deck, located next to the unit.

In my old age, I've grown lazier and complacent, letting necessary home and auto maintenance go, simply because it hurts to move much, and just an "it'll be OK" mindset, I have recently acquired. I'm no longer the proactive mechanic I was, before I began my physical decline.

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01 BMW X5 E53,3.0i-5L40E, 7/13/01
topas-blau,Leder-grau,"resto-project car"

Here:
14 Lexus ES350,3.5L-U660E
09 HHR Panel,2.2L-4T45E
04 Chevy 2500HD,6.0L-4L80E
98 GMC Sierra 1500,5.7L-4L60E

Gone:
66 Chevelle Malibu 2dr ht.,327>441c.i.-TH350>PGlide/transbrake
08 Cobalt Coupe,2.2L-4T45E
69 & 75 C10s,350c.i.-TH350
86 S10,2.8L-700R4
73 Volvo 142,2.0L-MT4
72 & 73 VW SuperBeetles,1.6l-MT4
64 VW,1.2l-MT4
67 Dodge Monaco 500 2dr ht.,383c.i.-A727
56 Chevy 210 4dr,265c.i.-PGlide