Pages N:01:03-09 of the Workshop Manual show graphically which diaphragms should be activated for each HVAC mode switch setting. Text at the bottom of each page also explains quite well. Page N:08:15 documents vacuum hose routing -- if you still have factory hoses simply follow their colored stripes ("pipe traces"). A hand vacuum pump is invaluable for trouble shooting vacuum operated devices. Will verify that all HVAC plumbing is indeed vacuum tight from the engine compartment Tee forward (remember: my leak was under the console). Can also use it to manually operate each ductwork diaphragm individually. Bill Robertson #5939 >--- In dmcnews@xxxxxxxxxxxxxxx, "ryanpwright" <yahoo1@xxxx> wrote: > > > What is the proper operation of the mode switch? In other words, where > should I get air on the various settings? > > Here's the deal: I get A/C just fine on the three A/C settings, but > there isn't much of a difference between them. The airflow is boosted > slightly when on max. Mid and low appear identical. When the > temperature is switched to hot, "vent" directs air at my feet, > "heater" doesn't seem to direct air anywhere, and "defrost" seems to > direct more air toward the windshield but not as much as I'd expect. > If I switch the temperature over to cold, all of this changes > completely! > > So I dug into it tonight. The dreaded previous owner screwed up my > vaccumn lines. I did my best to sort them out, following the diagram > here (http://www.usadmc.com/dmcstore/images%5C730.gif). There was an > extra T where one shouldn't be, another with a missing hose, etc. > Anyway, I think it's all as it should be now, but the situation hasn't > changed any. > > I've: > > 1. Rebuilt the mode switch. There are no vaccumn leaks that I know of > either up front or at the engine - doesn't mean they aren't there, > just that I don't know of them. :) > > 2. Sealed (as best as I could) that foam behind the heater box with > some duct tape. > > 3. Tried to sort out the vaccumn lines, I THINK they're correct, but > who knows. > > Any thoughts? > > -Ryan To address comments privately to the moderating team, please address: moderators@xxxxxxxxxxx For more info on the list, tech articles, cars for sale see www.dmcnews.com To search the archives or view files, log in at http://groups.yahoo.com/group/dmcnews Yahoo! Groups Links <*> To visit your group on the web, go to: http://groups.yahoo.com/group/dmcnews/ <*> To unsubscribe from this group, send an email to: dmcnews-unsubscribe@xxxxxxxxxxxxxxx <*> Your use of Yahoo! Groups is subject to: http://docs.yahoo.com/info/terms/