I've had these hoses lying around since I did my engine swap, and I just realized that they must be from my HVAC system, I'ts been stuck on defrost since the swap and a search of the same problem says no vacuum is the culprit.
My problem: how do you mate these hard plastic little hoses to anything with vacuum?


They're coming from this bundle (in yellow)

 

It's kinda hard to tell from the pics, but if im not mistaken the longer hose hooks up to the top of your heater controll valve, which maybe you ditched in your swap. The shorter hose on a TPI car goes into a bit of a T with one tube hooking up on the bottom of the plenum, and one going to one of the hookups on the back passenger side of the plenum. That said I have no idea how to make them work with the setup you have now.

 

Thanks Lax,

Does anyone else have any thoughts on how to get this going with a carbed setup??

 

I'm thinking maybe you could put a fitting in the bottom of the air cleaner and hook it up to the shorter of the two hoses, seems to me that would accomplish the same thing as it does being hooked to a plenum. Do you still have your heater control valve?? If not how did you re-route the hoses?

 

One is for the HCV as said and the other is manifold vacuum for the HVAC controls.
Which one does what is sort of hard to tell w/o the ends on them. Hook one up to a manifold vac. port on the carb and see if it makes the controls work (makes the 'pfshhht' sound when going from vent to floor). If it does, there other is/was for the HCV.

 

Excuse my ignorance, but what is the heater control valve? Where is it and what does it do?

 

Heater control valve is yet another part added to prematurely fail leaving you screwed on the side of the road.

It's a vacuum operatedd valve that when the climate control is turned to 'cold', it (the control) passes vacuum to the valve which in turn bypasses the heater core (for cooler air I suppose since these cars have such a **** poor HVAC system).

It looks alot like this...

 

Thanks Deadbird!- I definitely don't have that valve in place any more....
I managed to get one of those little plastic hoses attached to vacuum, and after I was smart enough to cap off the other one (15 minutes later) my vents switched, but not completely - It puts some air to the floor when it's on "HTR" but it also is blowing a lot through the top vents.