Auto Temp II

["Mark Blitman" <markblitman@xxxxxxxxxxxxx>]

brad..i believe you have isolated the problem..took the car out tonite and
put temp lever to 85 and depressed LO-Auto button and blower would not come
on after car warmed up....so my guess is the cold engine lockout switch on
the water valve is not unlocking at 125 degrees and therefore vacuum is not
flowing to master switch...so apparently what i have now is a regular
a/c-heater set up with no ATC...i will get a new Water valve in the morning
and let you know results...thanks!
----- Original Message -----
From: <roadhogg@xxxxxxx>
To: <mailing-list@xxxxxxxxxxxxxxxx>
Sent: Wednesday, December 25, 2002 1:48 PM
Subject: Re: IML: Auto Temp II


> Mark.  This is my understanding of how the system works.
>
> In the Auto positions, the system will not start until the engine coolant
reaches about 120F.  There is a temp sensor built into the water control
valve that is located in the heater hose under the hood, near the firewall
and the right side of the car.  There are three vacuum lines going to this
valve.  You can see a picture of it here.
> http://www.nybclub.org/m&r/AutoTempDemoModel/image9.htm
> This temperature activated vacuum switch turns on the master switch that
is located on the top of the airbox under the dash.
> http://www.nybclub.org/m&r/AutoTempDemoModel/image6.htm
> It is the turquoise one on the left in the pic.
> If I were to troubleshoot this issue, I would start by bypassing the
vacuum switch under the hood to see if it is faulty.  I understand these are
available new.  Then, check the master switch under the dash pad.  Once you
confirm that these are ok, it is still doesnt work, please let me know, I
might be able to help further.
>
> ----- Original Message -----
> From: Mark Blitman <markblitman@xxxxxxxxxxxxx>
> Date: Tuesday, December 24, 2002 2:04 pm
> Subject: IML: Auto Temp II
>
> > hi gang and merry x-mas to all..has this ever happened to you? i
> > depress the LO or HI-Defrost button on my '74 Imp to get the fan
> > working for a few seconds and then I depress the LO-HI- Auto
> > button and I hear the blend door close(or is it opening?) and then
> > the A/C works normally....
> >
> > Otherwise..if i just depress the AUTO button the a/c will come on
> > but with no fan..and if i lift the hood i will see ice on the
> > expansion valve....
> >
> > is this weird or what?..i guess i should be thankful its working
> > although it would be interesting to know what it is doing..thanks.
> >
> > mark blitman
> > '74 Imperial
>
>
>