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Tesla Vision fails as owners complain of Model 3 cameras fogging up in cold weather
(www.notebookcheck.net)
This is a most excellent place for technology news and articles.
I mean how hard is it to give us tiny wipers on them. Cmon now.
It's probably internal fogging because the units aren't well sealed.
They aren't normally sealed in most integrations, but will often have heater wires around them or embedded in the windshield that will heat up the windshield/sensor enclosure, just like the defog on a rear window or mirrors.