Importance

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Abstract

A central control unit having an air-distribution control formed as a control knob that has a FLOOR LEVEL setting, a DEFROSTER setting, and a MID-LEVEL setting therebetween. A method includes the steps of: actuating with the control knob a first air flap disposed in a fresh-air duct; supplying air to at least one fresh-air nozzle in the mid-level area; controlling with the control knob a supplementary air flap disposed in a warm-air supplementary duct via the first air flap that is directly coupled to the supplementary air flap; supplying the fresh-air nozzle with air by the supplementary air flap; positioning the control knob such that in the MID-LEVEL setting the first air flap is in an open position for fresh-air admission and the supplementary air flap is in a closed position relative to a heater core; positioning the control knob such that in a setting between the MID-LEVEL and DEFROSTER or FLOOR LEVEL settings the first air flap is in the open position for fresh-air admission and the supplementary air flap is in the open position relative to the heater core; and positioning the control knob such that in the DEFROSTER setting or the FLOOR LEVEL setting the first air flap is in the closed position for fresh-air admission and the supplementary air flap is in the closed position relative to the heater core.

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First Claim