I fixed my intake manifold oil leak, and now the air only blows out of my floor vents. It doesn't matter what setting, a/c, heat, vent, defroster, ect, it only blows out of the floor vents. I'm guessing theres some valve or something that determines the airflow, but I have no idea where its at to check it.

 

vacuum is used to move that stuff. Check on the passenger side of the intake that is where the tube is and it runs into the wiring harness. Maybe you forgot to hook it back up or it got pinched or cracked?

 

Check vacuum as stated. When you have a leak it defalts to this position.

 

http://shbox.com/1/4th_gen_tech2.html#HVAC_vacuum

 

I just checked and that vacume line was off. Thakn you.