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Want to DIY clean evaporator coils; sealed up strangely?

9.3K views 12 replies 8 participants last post by  beenthere  
The OP acts like this is the first time he/she notices this "spray foaming." Makes me wonder if filters have been changed. Why would anyone do that foaming stuff anyway?
The tech just assumed it was a dirty coil? OP said "something" ( I guess the low side line) iced up on the outside unit. Meaning the same line at the coil iced up, thawed and dripped onto the furnace.
Wonder if there is a freon leak and it's at the coil.