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Old 02-20-2009, 05:26 PM
Donno's Avatar
Donno Donno is offline
Join Date: Apr 24, 2006
Location: Sechelt
Posts: 128
Vacuum lines - thermostatic door

I've been cleaning up the vacuum lines on my 86 GW with a 360. Where is the vacuum suppose to be hooked to for the air diverter door in the air cleaner housing? Is it connect to the side of the air cleaner or the bottom? Currently it's connected to the bottom and does not seem to be opening once warmed up.

86 Grand Wagoneer
BJ's 6" lift, Fenders cut, 35X12.5 M/T's
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Old 02-20-2009, 09:37 PM
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djongeward djongeward is offline
Bleedin' Gasoline
Join Date: May 21, 2008
Location: Imperial Valley, CA
Posts: 1,818
There should be two vac valves connected togeather with their associated delay valves. These are routed to the back of the air cleaner and then into the vacume system. I think the cold door stays open if their is no vac but not sure. When the system is working, they regulate between and keep the air a consistant temp.

There is a good write up on this in the standard Haynes manual. The shop manual has better vac diagrams.

There are some variations in the setup. I'm referencing my 89 info.
89 Grandwagoneer, built 360, COMP cam set, port matched Edelbrock SP2P, 475 cfm Holley ORA, Thorleys, MSD6a, extra cooling and oiling.
76 Cherokee S Chief - rebuilt stock, Holley, Performer, MSD Dizzy.
89 GW parts waggy
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