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Originally Posted by Brian Carlton
Note the following:
The selection of "defrost" shuts down the vacuum to all actuators. So, if thre are any leaks in the pods, the system won't see the leak because no vacuum is sent to any actuator in this condition.
The climate control system should have a restrictor to prevent the exact scenario that you experience. The SD, like all of the 20 year old vehicles, had two leaking pods for years, resulting in defrost all the time, but the transmission was not affected because the size of the vacuum leak through the restrictor was not sufficient to drop the vacuum to the transmission.
So, if you can't get your pods fixed quickly, get the restrictor back in the system and all will be well.
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Ok, here's what I've done so far: I found the pink and white (it was white in my case) vacuum element for what I assume is the defrost. It's located exactly where dmorrison said it would be in his outstanding (wow!) pictorial.
I discovered that this particular element holds vacuum, but pumping it up is a slow proicess for some reason. It takes several pumps on my Craftsman vac pump to get up to a level most where one pump would normally take it. Once there it holds it, though.
There seems to be a leak down the line, though, because when I keep that connected to the defrost element it doesn't hold vac. This is a red and blue line that seems to run from the back of the defrost element (as opposed to the vac line that runs straight down) to one of the center vents.
I took everything out that can be taken out other than the dash and there's no way to get to it.
So here's a question: what happpens if I put a BB in the line running from the back of the defroster element to the center vent?
And oh yeah, about the restrictor: what is the restrictor, exactly? I noted a black orifice behind the CCU but this doesn't appear to be directly connected to the defrost element.