RE: IML: 70 autotemp

["Dick Benjamin" <dickb@xxxxxxxxx>]

There are two vacuum operated switches mounted on the front of the air
plenum.  One is yellow and controls the compressor; the other is green and
controls the whole system.  When you push the "OFF" button, the green switch
should not be getting any vacuum.  

Find these two switches - they look like mushrooms, and each has one color
coded vacuum hose and a two wire push-on connector, also color coded on the
wires to match the switch.  

I suspect someone has bypassed your master switch (the green one) by
unplugging the push on connector and jumpering between the two contacts in
the connector. I've done this myself when I'm troubleshooting the system or
to work around a bad switch or vacuum leak. If this has been done, the
system won't shut off.  

The only other cause for this symptom is going to be much harder to track
down, and more expensive to fix, so try this one first.

Dick Benjamin

>>>>>I have an autotemp 1 system that does not shut off when I 
>push the off button! Boy does it get hooootttt!!!! You would think that 
>would not be possible considering it is an AUTOtemp system. My refridgerant

>charge only lasted three months before it all leaked out. My FSM says that 
>if the system does not shut off when the off button is pushed it could be: 
>1) Check valve #2 ;or 2)push button control is bad. I tested the Check 
>valve and it is good, besides the fact that I replaced it 6 months ago. So 
>that leaves me with option #2 but shouldn't the system detect all the heat 
>and do something about it even though I have no refridgerant? Could a 
>sensor be bad? But I don't think refridgerants and sensors have anything to

>do with the inability to turn off. I have also tested the petentiometer 
>dial and it is good, and I have replaced the water valve and water valve 
>thermostat. Please help. You would think that a heater that does not shut 
>off in the winter would be a good thing.
>
>Keith     70 LeBaron








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