18-09-2020, 01:07 PM
Haven't worked on on the blower or fascia controls myself but hopefully these previous threads will be of some help. I believe there are cables that control a variety of flaps. It could be none of them are being held open.
https://www.306oc.co.uk/forum/showthread.php?tid=19788
https://www.306oc.co.uk/forum/showthread.php?tid=19788