im having this issue where it seems my vent for my floor arent opening. if i turn the **** on my controls to just the floor it will come out the front windshield defroster instead and if i turn it to the upper vents and the floor it comes out the upper vents and the front windshield defroster other then that everything else works. any idea what might be the issue?

 

do a search for "no floor heat" there is a how to on this.
your damper for the floor vent is broke at the arm where it connects to the vacuum actuator.
not to hard or expensive to fix.

 

i did the search and the only this i could come up with is the vacuum actuator for the blend door is shot :P

 

here ya go...

https://blazerforum.com/forum/2nd-ge...or-heat-17808/

two diff fixes in this one.