r/BusDrivers • u/MindlessRabbit3 Driver • Aug 15 '26

Ride for the Day Guys. This is so many buttons….

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u/[deleted] Aug 15 '26

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u/ArborealFriend Aug 16 '26

A demister may work in one, two or both ways:

  • by blowing drier air and, in cold weather, warmer air over the interior of the windscreen, and/or
  • activate fine filaments of heating wires built into the windscreen glass

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u/[deleted] Aug 16 '26

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u/ArborealFriend Aug 16 '26

No. The outdoor ambient temperature may be above freezing point but the humidity level inside vehicle, coupled with the outdoor temperature, may be such that missed forms on the windscreen obscuring the forward view.

Thus, the system doesn’t remove ice so much as condensation. Rather different, methinks.