What is this thing?
 

I am cleaning up the friewall of all wires/and uneccessary stuff, what can I get rid of in this pic? I don't plan on using stock ac/heat but it has to stay until I get the aftermarket kit. What is the ball thingy in the middle of the pic? What else can I remove butstill retain the heat/defrost portion of it?
http://i154.photobucket.com/albums/s...k/IMG_0721.jpg

Re: What is this thing?
 

It stores vacuum that operates the vacuum actuators for the ducts.

Re: What is this thing?
 

So I need to keep it for the heat to work right?

Re: What is this thing?
 

Yes, or the heat will just go to the floor and not to the window. There should also be line going to the manifold.

Re: What is this thing?
 

On my 78, that canister is more squared off than that one, but it serves the same purpose. Currently all the hoses are plugged and tie-wrapped out of the way, because I don't know where they should go. Any pix of the end points of the two lines coming off that canister?

Re: What is this thing?
 

our trucks dont have vacuum actuators for the heat and defrost. its probably for emmission or cruise control. my bet woud be emmission.

Re: What is this thing?
 

Pyro is correct, it stores vacuum for the vent, floor and defrost vacuum motors. The temp is adjusted by a manual cable (blend door).

Re: What is this thing?
 

There is nothing you can remove in the pic and retain heat/defrost. You need the blower motor, resistor block, heater core and vacuum canister. What kind of aftermarket unit are you installing? I'm looking one for my dads' truck.

Re: What is this thing?
 

Vintage air has a bolt in kit but you need heat only controls for it.