I have a 1968 M20G and was noticing behind the glareshield there are all these holes which look like they are for airflow for a defroster type function for the windshield. However, I don't have any separate controls and when I have the cabin heat on it doesn't seem like is any airflow going to the windshield. I was just curious if there was supposed to be and things to look at maybe I am missing.
Thanks for any comments.
Neal