Mercedes-Benz E 500, Owner'S Manual

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3 Bi-Level ventilation - Heating
This setting is used if the inside of the windshield
begins to fog up, ice up or when wet snow is falling.
As soon as the windshield has cleared, reset to PI
or 0 -
In the heating mode, warm air is supplied to the
windshield, foot area, and to outlets (8). Addi­
tionally, air may be emitted periodically from out­
lets (6), depending on the interior temperature.
In the cooling mode, cool air is supplied to the
windshield, foot area, and outlets (6) and (8).
Note:
In warm, humid climates, prolonged use of this
setting may create condensation on the outside of
the windshield, directly above the defroster ducts.