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Q: Defogger Defroster doesn't work on 2004 Chevrolet Impala

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
The heat and AC work from all vents except the defroster defogger main vent. The blower runs but nothing comes out of the main vent. Any repair suggestions?
(1) Answer
Hi, sorry to see you didn't get an answer to your question, were you able to find out what was causing the problems with airflow to the main vent? Was it one of the motors for the vent flap?