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Topic Review (Newest First)
11-04-2010 08:41 PM
fast68 one is for full time intake manifold vacuum source to run the HVAC control panel.

when you have it right you will be able to hear positions change via vacuum sounds noises in the heater boxes with engine running/idling, unless the control assmebly is broken or leaking vacuum badly

the other is for flow valve in heater core hose

pretty easy simple

the latter one you dont need, ignore it, plug it with a small screw

do away with the valve in the hose

10-29-2010 05:56 PM
LATECH Hook a hose to manifold vacuum and then to a one way check valve then put A Tee in line . hook one to a vacuum storage canister and the other to the feed to the HVAC control. There are 2 hoses I know. One of them comes from the HVAC controller to the hot water control valve for the olds motor.The other one is the supply for the control.Try it one way and check for dash vent and defrost and foot vent etc. If it doesnt work switch the hose and check again.
10-29-2010 05:02 PM
whojohnjones ok I should just tell the problem..I have removed all the olds 307 and all emissions i have two vacuum lines from the dash for vents..maybe a gm person knows alot about this. how would I hook up vacuum lines to 350 engine
10-29-2010 04:41 PM
Originally Posted by whojohnjones
can't seem to locate em there
The library as someone suggested may have a motors manual you can check out or copy the page so you dont have to worry about greasin the pages or returning the book 4 years late and paying a fine.
Try an emission motors manual if they have one. If not you may have to go to autozone to get them to print it off for you.
Also your local buick dealer will probably have it. Talk to a service manager he might be kind enough to oblige.
10-29-2010 03:35 AM
1ownerT Maybe your local library.
10-29-2010 01:33 AM
crownver This is as close as I can get.
10-28-2010 08:50 PM
whojohnjones can't seem to locate em there
10-28-2010 08:32 PM
LATECH I think has them for free.
I remember the vac system on the E4MC carbs . They were like a chinese jigsaw puzzle. good luck
10-28-2010 07:25 PM
vacuum diagram

anybody know where could I find a free vacuum diagram for a 1983 Buick parkavenue?

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