This was quite common on F30 on cars that sit without running the AC.
You can run a cleaning foam like this https://www.amazon.com/Lubegard-9603.../dp/B0007PHD0S
It should be injected through the drain pipe underneath, found next to the transmission, it's a dark gray valved tube.
-Abel
- E36 328is ~210-220whp: Lots of Mods.
- 2000 Z3: Many Mods.
- 2003 VW Jetta TDI Manual 47-50mpg
- 1999 S52 Estoril M Coupe
- 2014 328d Wagon, self-tuned, 270hp/430ft-lbs
- 2019 M2 Competition, self-tuned, 504whp
- 2016 Mini Cooper S
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