im wondering where this goes and what it does (first picture) the line coming from it goes to a y fitting with one end going to my canister and the other just left open, should it be hooked to something ? (second picture)

 

also im trying to get my hvac working, the line that comes from the firewall seems to go to this (picture below) there is another spot below it which is left open, can someone tell what this is for and should something be hooked up to it ? Thanks

 

The second picture looks like a heater core diverter valve and that vacuum opens and closes the flow to the heater core. Does your heat work? Oh wait nevermind thats the canister. I dont have a clue what those may be. Has this car been in a wreck?

 

no, i had a 350 put in, my hvac wont switch vents, the line coming from the passenger side firewall which is said to be the hvac vacuum looks like it runs to that box in the second post but the port below it has nothing there, im wondering if i hook a vacuum to that open port maybe my hvac will work ? and im just trying to figure out what the part in the first post is and where the vacuum goes for it, one end goes to canister and the other end im not sure...

 

Well its not going to hurt anything if you try so just try it out. Nothing I hate more than trying to figure out how vacuums run.

 

no it wouldnt, but it would save me a trip to buy vacuum hose, somebody must have this setup, its a 1984 camaro Z28 WITH AC, any help on these two things much appreciated

 

anyone ? it has 3 wires going in to it, with a vacuum on the other side that goes to a y fitting, then one end goes to the canister and the other is left open... does it need a vacuum, or can i just plug it ? Thanks

 

ok, ive figured out that its a torque converter lockup vacuum pressure switch, ive recently changed the torque converter on my car, can someone tell me if it is needed, and if so what type of vacuum it needs, Thanks

 

This one goes to an elbow on the intake manifold right behind the carb on mine. Just a generic manifold vacuum source.

 

thanks ive figured everything out except the vacuum for the TC lockup vacuum pressure switch, what will happen if i leave it unplugged and what type of vacuum does it require ? Thanks

 

Connect the TCC lockup to manifold vacuum (below throttle blade.)
The vacuum source for the HVAC should be connected to a manifold port, but with a check valve that traps vacuum in a reservoir ball mounted underneath the battery, or purge canister location.
The line that is tied into the Purge Canister line should be connected to ported vacuum (above the throttle blade) so that the tank fumes are only sucked into the TB during part throttle.

 

Thanks, i have a holley carb with only one manifold vacuum open, can both the hvac and TC share it ? as it is now the line that goes to the canister also goes to the TC valve

 

anyone ?