[DMCForum] Re: Air system/mode switch question

["content22207" <brobertson@xxxxxxxxxxxx>]

Vacuum lines are coded with a colored strip. Use the chart on Page
N:08:15 of the Workshop Manual to figure out which diaphragm controls
what. Pages N:08:03-09 are easy explanation of various door positions.
You want the red line to face level vents (panel vents). You can use a
hand vacuum pump to activate the diaphragm manually during diagnosis
(remember that the loose hose will be a small vacuum leak with the
engine running unless you plug it). Normal position of the FLV door is
closed.

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "Walter Coe" <Whalt@xxxx> wrote:
> Brian,
> 
> The a/c has several vacuum-actuated flapper doors, and it
> sounds like the one for your dash & door vents is not
> opening.
> There are a couple of things that can cause this.  First
> determine if it is a vacuum problem.  Does the mode switch
> hiss?  Do you hear the various flapper doors open & close
> when you turn the mode switch thru its full range?  Put the
> blower speed to "0" so you can hear better.  Momentary air
> noises are normal.  But a constant hiss from the mode switch
> is a leak.  Did you hear the doors move?  If not then either
> the mode switch is broken or a vacuum line is phuct.  If you
> did hear them move (which means that at least some of the
> actuators are getting vacuum) then most likely you have a
> broken vacuum actuator that controls the dash vents.  The
> arm on it is made of plastic, and they are known to break.
> Exact replacements are very expensive.  I would make a new
> arm first.
> 
> Let us know what you find.
> 
> Walt    Tampa, Florida

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