AC air coming out of defrost vents

[Steve Sherman]

Bruce:

This may be some small part of the problem.  The first mile or so of my
commute is on dirt roads, which supply more than enough bumps.  Sometimes the
bumping will cause the air to switch to the dash. (Much less now that I have
switched controllers to my "spare")  However most often it does not, and even
hitting the controller directly does not have an effect in most cases.

While I fully agree with your design comments, I have checked (by mouth) and
all the the 4 lines in the controller do seal when they are not activated.  So
Unfortunately I don't think this is what is going on in my case (at least this
time).

Steve

Bruce Toski wrote:

> The small pintle check valves located in the four 4 ? electromagnetic
> solenoids located inside the controller which is mounted behind the glove
> compartment are not spring assisted.  This oversight, IMHO, causes erratic
> operation of the vacuum solenoids.  Next time air comes out the defrost,
> kick, .............er, tap the controller and see if air starts coming out
> of the chest vents.........
> This is assuming there are NO vacuum leaks in any of the vacuum air valves
> that control air flow throughout the system.  Curious to know if this
> helps.......
>
> Bruce Toski
> 2361 SW 36th Terrace
> Fort Lauderdale, FL 33312-4291
> Phone (954) 583-4191
>
> 72 and 73 Audi 100LS sedans
> 86 and 91 Audi 5000/100 sedans
> 74 Mazda REPU (Rotary Engine PickUp)
> http://clubs.yahoo.com/clubs/audi100c1series