Join Date: Mar 2002
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vacuum operated duct door what? (update w/pic)
The cables that operate the vent/heater/etc... in my YJ eventually got stubborn enough to bend the wire. After straightening out the wire, I took a look at the plastic piece-o-junk that serves as the YJ's stock ventilation control and watched it flex all over the place when I tried to operate the levers. If I had assembled it back stock, it was gonna break. Like yesterday.
Anyway... decided to go with the CJ style cables and fab up something on the dash. I'll post pics when done. But right now I'm looking at this vacuum-operated plunger mounted on the fresh air intake ducting that pushes and pulls on a bellcrank that disappears in the duct roughly right above the glovebox. The vacuum line was routed to a plastic (of course) switch on the back of the dash control assembly that looks like it was depressed when the selector was in "off" and maybe half-depressed when the selector was in "defrost".
Does anybody have any idea what the purpose of all this was? I'm guessing there is a door in the ducting that is operated by the bellcrank, but why is it linked to vacuum? And what does it do? If I just disconnect it, which position should I leave it in? Should I rig a way to still operate it?