The air conditioning will not redirect fully to the dash vents.

Find out if there are any Electronic Air Temperature Control (EATC) on-board diagnostic tests for your truck, as there are for some Fords:

https://www.askmehelpdesk.com/cars-trucks/faq-how-troubleshoot-repair-maintain-hondas-selected-other-vehicles-46563-11.html#post1999642

Just performing the diagnostic tests can often solve any control problems.