OK for about 3 years now my heater/ac has been coming through my defrost vents. Well today I decided I want to fix it so I been researching and have found 2 hard vacuum hoses that I don't know what they go to and might be my cause.

This starts at the driver side disconnected and runs under the lip where the hood rest.


and then goes down into a harness on the passenger side next to the heat box and all the wires from the heater box goes down into this harness also.


I also have on disconnected behind the carburetor close to the passenger side.


That goes to this like sensor on the firewall.


Then I have this one that goes to the orb in the fender and my cruise control.


Can anyone tell me where these should go???

 

The last picture is the main vacuum source for the cruise control and vent/ac controls.On my van that one is connected to a stud in the manifold aft of the throttle body and it has a check valve before the "t".
Hook it up to manifold vacuum and see what happens.

 

I finally figured it out took like 3hrs of reading on this site to do it though . Picture 1/2 from my original post is the HVAC control hose. I had to buy a check valve(GM# 14056648) picked one up at the dealer 1hr ago; 1' of 7/32" vacuum hose; 7' small vaccum hose forgot size; now what I did to fix it. The check valve T's to the PCV vacuum hose (picture 2) and then to my HVAC control hose picture 1 and then goes to my vacuum canister picture 1&3. After all this was connected it still didn't want to really work very well took a long time to move the diverter. The purple hose under the dash was also kinked; un-kinked it now everything is great!! I still need to get a new purple hose anyone know where to get these? Thanks for everyone great info on the site .

Picture 1


Picture 2


Picture 3

 

can anoyne tell me where to get the colored hard lines under the dash at? The purple one to be exact? mine is colapsed.