ac vacuum source please

[Low82C10]

i did not know that in order to switch the ac selector around you had to have a vacuum source. well i have a 82 swb i just got done putting a 5.3 and put the heater hoses on and my heater works but only blows on the floor and since i didnt have that little radiator deal in the box on the firewall heat was coming out of there also. so my question is, where do i get a my vacuum source from and where does it go to? i did a search for a diagram for the vacuum for my year but came up with nothing.

[DnStClr]

Here's a diagram for the vacuum lines, the source is going to come from the intake manifold ( constant vacuum) and then go to the heater/vac control, but the source from the 5..3L might be different.

[Low82C10]

thanks helps out a lot, my question is wouldnt the source go to the vacuum reservoir? my vacuum reservoir has to outlets one which goes inside the cab.

[DnStClr]

Sorry. You're right- it goes to the vacuum reservoir that looks like a ball. The diagram doesn't do a good job of showing it does it?

[sonicbluezx3]

How about for a diesel? Would I need to just hook up to the vacuum pump on the back of the engine?

[DnStClr]

Yes. On the vac pump, since there is no vacuum supply created by the diesel engine.

[sonicbluezx3]

Okay that's what I thought. Is there supposed to be a reducer of some sort? The outlet of the vacuum pump is a lot larger than those individual vacuum lines running into the cab.

[DnStClr]

yeah, I don't know exactly what the fitting looks like, but here's a link for some examples
http://www.plews-edelmann.com/plastic-and-soft-rubber-fittings/