[DML] Re: Proper operation of mode switch

["content22207" <brobertson@xxxxxxxxxxxx>]

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








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