Funny, I had exactly the same problem today. I'm wondering if someone put plain water into the system, although only my dealer and I have added fluid (and I know it wasn't me.) When the temperature got slightly above freezing today, it worked fine. I took that as an opportunity to purge the system and add a little washer fluid. I'll know whether it worked in the morning.
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2017 X5 35d (Performance Center delivery March 2017)
2019 230i X-drive
2022 M3 base
2000 328i sedan (UUC suspension - still the favorite), 2006 M3 slick top - Alpine White/Cinnamon
SOLD! 2008 E90 M3 SOLD! 1991 325iX (both great), 2019 Miata RF - various others not as memorable but gone.
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