Weird A/C behavior

Wallace White wallace at
Fri Aug 23 09:40:46 EDT 2002

Doyt -

Again, sorry I'm coming to the party late. Yes, the plastic bracket used
to be a mounting for the servo / piston. They break so commonly that
Audi has a retrofit kit for them consisting of a heavy steel bracket
that mounts over everything. See below:

- Wallace
   '87 5kcstq 189k

Doyt W. Echelberger wrote:
> OK, I spent some mopre time this morning in the pretzel position under the
> dash, examining the view through the inner (lower?) trap door behind the
> glove box.  There isn't any "cage" around the vacuum solenoid.There was a
> cage there at one time because I remember it. The solenoid is attached to
> the upper outer trap door and is loose, wobbly, and apparently just hanging
> there. A rubber (plastic?) vacuum hose attaches to the loose end of the
> solenoid, and I don't mean the end that is attached to the upper outer trap
> door.
> I can't see anything for this solenoid to do except dangle.
> That would be a useless way to have engineered it, so something must be
> missing, like a way to attach it to something solid.
> The diagram at Scott's web site doesn't show any outer end attachment of
> the solenoid, as far as I can see.
> On my car, I  see 2 lever arms, one on each side, connecting the inner trap
> door to the outer trap door.   I also see a central pair of supports that
> are not part of either door, but appear to be attached to the body of the
> car. The solenoid dangles above this support, and it's vacuum hose goes to
> the solenoid through a space between the two sides of the support.
> OK, I think I understand. The solenoid WAS at one time fixed to the central
> support. That way, the lever arm of the solenoid would open and close the
> outer door. And since the inner and outer doors are connected by a spring,
> they could act on each other.
> My next experiment will be to devise a bracket to hold the solenoid to the
> central support fixture.  I am going on a 300 mile trip right now, and
> can't do that until I return.
> More later.  This is moving along, somewhere, somehow.
> Keep in touch.
> Doyt Echelberger
>  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>...
> At 07:16 AM 8/16/2002 -0400, you wrote:
>> When I took a few hours to clean out the leaves (by opening the
>> under-dash
>> hinged door behind the glove box) I found the hose to the vacuum solenoid
>> disconnected and dangling, and the solenoid was loose in it's plastic
>> support cage. I used epoxy to attach the solenoid to it's cage and to
>> hold
>> the hose to the solenoid. This fix didn't change anything in the way it
>> worked, so I'm going to go back under with a flashlight and see if I have
>> any new insights while upside down, curled up like a pretzel. And I'll
>> try
>> the "Econ" and letting up on the throttle trick. Be assured, you will all
>> hear of any success.
>> Let's stay with this until we get it working right.  Thankfully, the
>> default position does cool the cabin fairly well on my car, most of
>> the time.
>> Doyt Echelberger
>> 87 5ktq in hot and humid Ohio

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