White flaky substance at rear AC?

[Gadgtfreek]

Any ideas? It is all dry, so it happened sometime in the last week to 10 days, as I haven't been in the back.

 

[Cruising68]

Looks like it got wet with something. Does your rear ac still get cold and your heat work back there?


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[2020FordRaptor]

Has it rained lately in your area?

 

[Gadgtfreek]

We had heavy rain on the weekends of the 21st and 28th. I wasn't able to find much other than a comment about a condenser coating. Nothing out of the other vents, just where the rear unit is.

We have had a lot of freezing weather the last 14 days too. To me it looks like hard water dried and left scale.

 

[2020FordRaptor]

Just a shot in the dark, but maybe when it was raining it was dirty rain and when you opened the tailgate it got in?