So i installed new ac vacume hoses and its syill not blowing through the font vents. Anyideas?

 

I had the same thing happen to my 78. Check the vacuum lines from the back of the manifold. The smaller hose tees off to the evap canister and one hose goes through the firewall. This is the one that controls the diverter that defaults to defrost if you lose vacuum.

Hope this helps.

 

I had a similar problem but my vacuum line was disconnected behind the dash- actually behind the ashtray and radio. All better now.

 

All the hoses seem to be good. I think my evap can mightbe bad or something.