Vacuum line routing from canister (HVAC/cruise)

[hgeranium]

Not my picture, but this is the style canister that I have. I understand that there is the big line that goes to the intake manifold, then a line for CC and a line for HVAC. My question is: from those two HVAC vac lines (that come through the firewall, positioned vertically from each other), are there supposed to be two separate vac connections? And are they supposed to both come from the canister? If that's the case, I must be missing a pretty crucial splitter or T connection.

 

Also, where is the vacuum source for the heater control valve supposed to come from? I noticed that the line was completely broken off and was the source of my heat coming out of the defrost and air going to defrost upon acceleration once I hooked it up to the canister by 'borrowing' the line meant for the CC servo. I'm worried it's supposed to come from a place in the dashboard or something. If so, I'd rather rig something up to properly get it hooked to the canister.

 

This is where I'm more confused. I need vacuum for the CC servo, two(?) for the HVAC, and one for the heater control valve. But there are only two vac lines (apart from the supply line) that come from the canister. Does anyone have a picture of the vacuum routing on theirs? I haven't been able to even find a vac diagram that showed the heater control valve's vacuum source. Like I mentioned, I figure I'm missing a crucial splitter to spread the vacuum love around, but can't find any good reference pics.

 

I've seen the official diagram, which is sort of useful but doesn't answer the questions about how many lines I need and the question about the heater control valve. I want to end up redoing all of the lines with fresh hose and stick it under the coolant bottle.

[eaglescout526]

19 minutes ago, hgeranium said:

are there supposed to be two separate vac connections?

No. 
 

 

19 minutes ago, hgeranium said:

And are they supposed to both come from the canister?

Nope. One line goes to the valve and the other goes to the HVAC. One vac line supplies vacuum to all of the HVAC including the heater valve. I believe the purple one is heat and black is vacuum. 
 

Now here’s where this is interesting. You can hook this vacuum reservoir up wrong. One side is meant to be stronger than the other. Meaning if you hook the HVAC up to the wrong side, you’ll lose vacuum under acceleration to the HVAC learned this the interesting way haha. 

[hgeranium]

Just now, eaglescout526 said:

No. 
 

 

Nope. One line goes to the valve and the other goes to the HVAC. One vac line supplies vacuum to all of the HVAC including the heater valve. I believe the purple one is heat and black is vacuum. 
 

Now here’s where this is interesting. You can hook this vacuum reservoir up wrong. One side is meant to be stronger than the other. Meaning if you hook the HVAC up to the wrong side, you’ll lose vacuum under acceleration to the HVAC learned this the interesting way haha. 

That makes so much more sense! To confirm, the CC side of the canister goes to the servo, then the other side goes to one of the lines to the firewall and the other firewall line feeds direct to the heater control valve?

[hgeranium]

3 minutes ago, eaglescout526 said:

Now here’s where this is interesting. You can hook this vacuum reservoir up wrong. One side is meant to be stronger than the other. Meaning if you hook the HVAC up to the wrong side, you’ll lose vacuum under acceleration to the HVAC learned this the interesting way haha. 

Very good to know lol. I will be extra cautious when setting everything up again. Thank you so much!

[eaglescout526]

3 minutes ago, hgeranium said:

That makes so much more sense! To confirm, the CC side of the canister goes to the servo, then the other side goes to one of the lines to the firewall and the other firewall line feeds direct to the heater control valve?

Correctamundo!

And you’ll know when you set it up right or wrong. CC will work like normal but the vents for HVAC will stop blowing correctly. 

[hgeranium]

Just now, eaglescout526 said:

Correctamundo!

 

Good looking out, sir! I'm excited to pick up some fresh vac line tomorrow morning and fix it up.