Such control units select various modes of operation, which may include heating, ventilation, maximum air conditioning, normal air conditioning, windshield defogging or defrosting, use of {TAIL ~ floor}, panel and windshield air outlets, {HEAD ~ recirculation} of inside air, intake of outside air, and OFF, for example 
Such control units select various modes of operation , which may include heating , ventilation , maximum air conditioning , normal air conditioning , windshield defogging or defrosting , use of { TAIL ~ floor } , panel and windshield air outlets , { HEAD ~ recirculation } of inside air , intake of outside air , and OFF , for example
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