Just an FYI, according to the manual, if the airflow is set to foot, it still pumps air out the windshield defrost outlets:




I know it doesn't answer your question, but I thought you might just be interested in knowing that. I found that out by hearing air coming out of the windshield defrost vent when the Auto A/C system lowered the fan speed after hitting the desired temp (with the airflow setting set to foot). For some reason, the airflow was louder at the defrost vent at low fan settings than at higher settings.. go figure..