Weird A/C behavior

[Kneale Brownson]

--
That vacuum servo in the evaporator box only adjusts the amount of air
going into the HVAC system from either outside or inside the cabin.  I
suppose if the vacuum leaked there, it could reduce vacuum available to run
the other parts of the system.  But if the servo is just moving itself
because it's detached, I wouldn't think it would have any effect on which
course the air took subsequently in the system.  That's managed by the
heater core box flap controls and the servo motors under the dash behind
the radio, I think.

At 07:16 AM 08/16/2002 -0400, Doyt W. Echelberger 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
>
> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>At 05:09 AM 8/16/2002 -0400, Larry Leung wrote:
>>Paul, Doyt,
>>
>>I have a combination of your problems. I have the ability to get cooled
>>air through the dash vents,
>>but after awhile it blows out the defroster and floor (though not too
>>strongly). I have found two things
>>restore things to the dash (basically Paul's trick, turn the CC to ECON,
>>back off the throttle (raise the
>>vacuum), air out the dash vents again, turn back to A/C), or raise the
>>set temperature to the point the
>>fan doesn't run at full speed. I BELIEVE that it's a vacuum problem,
>>however I have yet to trace all the
>>leaks in the car's system (i.e. I don't quite pass the dipstick test) so
>>I'm not sure. Perhaps it's a leaking
>>servo under the dash. The problem is it's WAY too hot to work on the car,
>>especially under the dash
>>under the greenhouse in the hot sun. Ugh. Anyone have any other ideas?
>>
>>LL - NY       l.leung at juno.com
>>
>>
>> >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>>
>> > Date: Thu, 15 Aug 2002 22:38:31 -0400
>> > To: "Paul R. Luevano" <paul at clarity.net>
>> > From: "Doyt W. Echelberger" <Doyt at buckeye-express.com>
>> > Subject: Re: Weird AC Behavior
>> > Cc: quattro at audifans.com
>> >
>> > Paul, it does my heart good to read your story.  The A/C of my 87
>> > 5ktq has
>> > been doing that with increasing frequency for the past two years.
>> > This
>> > summer it has gotten to where it almost never blows out the dash
>> > vents when
>> > set on "Auto."
>>.......................snip.............................
>> > Check out Scott's stuff at the address below and let me know if you
>> > can
>> > make yours work.
>> >
>> > http://www.sjmautotechnik.com/AC.html#recirc
>> >
>
> >Doyt at buckeye-express.com>
>
>> >  >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
>> > At 08:45 PM 8/15/2002 -0400, Paul wrote wrote:
>> > >OK, so it has been hot .............snip...............
>> > >
>> > >Over the last few days, I have observed a very weird occurrence.
>> > When set to
>> > >"Auto" the AC will stop blowing from the dash vents.  This can
>> > happen after
>> > >several minutes or after just a few seconds.  It seems to blow out
>> > of the
>> > >defrost vents, but very weakly. Here is the weird part, if I switch
>> > it to
>> > >"Econ", it blows out of the dash vents with a vengeance.  I can
>> > then
>> > >switch back
>> > >to "Auto" and it will repeat, lasting from several seconds to
>> > several minutes.
>> >                       paul at clarity.net
>
>
>
>
--