Conditioned air systems and vacuum stuff.

[exilous]

Well I finally decided to put the AC in my dump truck. I took the regular heat box and its parts out and modified the firewall and put the conditioned air boxon. thats as far as I got. My main question here is that the truck used to have the manual hand vents. And I know that the A/c kick vents has a vacuum pump thing on the passenger side. I dont use A/C very often I tend to use it only on those God awful hot days. So I wanted to know if I don't take the kick panel vents out of the a/c truck can I just block off the vacuum line that would normally go to it so I can keep my manual vents? I don't see how it would be a problem, and the other one is the vacuum pump that sits right where the passenger wiper arm is what does that do? And do I need it in my conversion from non-A/C truck to A/C truck? And help on this conversion would be much appreciated. I should have some pics up of the firewall and the box installation.

[VileZambonie]

Do you mean the vacuum reserve canister? Yes you need that. The manual vents won't be an issue

[exilous]

I know that I need the vacuum ball, I was wondering about the vacuum controlled kick panel vents. I will get some pictures of everything that I am unsure whether I need or not. I will get those up tomorrow morning if everything goes my way.

[HAULIN IT]

I'm having trouble with this:

I don't see how it would be a problem, and the other one is the vacuum pump that sits right where the passenger wiper arm is what does that do? And do I need it in my conversion from non-A/C truck to A/C truck? And help on this conversion would be much appreciated. 

There isn't a "vacuum pump" in the system. As Vile questioned, are you talking the reservoir? If so, yes you need it for proper HVAC door operation. There really isn't anything you "don't" need...sure you can get away with not changing the vents, but why? It's about a hour job.
 You could probably get away with not using the idle compensator, but why? GM engineers designed a system & it works pretty good. My thoughts, Lorne

[exilous]

I may have called it a vacuum pump cause I couldnt think of the name, I think they are called servos? Here are the ones I am questioning
This is the one that controls the passenger side Kick panel vent seeing as how there isnt one on the drivers side i figured I would just post this one. and I would prefer to keep the manual vents because I don't use A/C very much in my new truck as it is. It will just be there for the extremely hot days.

This servo is in the cowl directly in front of the passenger seat right before the hood. Do I necessarily need that as well?


Those are the only two I was asking about, I left everything else untouched besides transferring it from one vehicle to another.  I don't see a problem with losing those 2 because the vacuum line that goes to both of them is only a a "T" and I can trace it all the way back and plug it up. But if anyone thinks I neeed them before I scrap the truck and get rid of them let me know. Thanks again.

[VileZambonie]

You need to be able to switch from fresh air from recirculate. I would just put them in since it's not that big a deal.

Max AC is an old way of saying recirculate

Norm AC is fresh air

[exilous]

which one controls the recirculate and which one controls the fresh air? So if I am assuming right I can put the cowl vent servo into my truck and I can just use the manual hand vent to do that recirculate or whatever right?