Since posting that thread, I learned that the only ones which used the Instrument Panel Integration Module are the LeSabres with the automatic climate control. I apologize that I did not come back and update this thread. I 'think' its fair to say that the Limited was the only LeSabre that you could order an automatic climate control. The LeSabre with the automatic climate control really has very little programmable functionality in the head unit. All of the logic was shifted to the IPM (ironically, more is typically charged on Ebay sites for the digital controller) but in reality there'* more happening in the analog unit head unit. On the LeSabre'* with the automatic climate control, the IPM sits above and in front of the accelerator pedal. Dropping the lower panel provides quick access.

I only have one LeSabre with the automatic climate controller. With what I know now, I really do not want another one & here'* why...Anytime the Recirc button is pressed the AC compressor turns on. The only way to get it to turn off is to press the vent button and make a manual adjustment to drop it out of Auto. In the winter, when its really cold, this leaves owners with (2) undesirable options, add chilled air to the cabin with the AC compressor or from outside air.

It turns out this one becomes a bit of a rabbit hole. There is constant that can be adjusted in the PCM program that says when the outside ambient air is below the setting, the AC compressor is disabled. However, it turns out there is a catch. Up until 2004, the PCMs that were installed were Service Number 12583826. And in this PCMs, the logic is reversed in these PCMs (the AC compressor is disabled above the setpoint, it must be an overlooked bug in the Assembly code). Starting in 2004, the PCM was changed to Service Number 12583827. The good news is the logic is correct in those PCMs and can also be adjusted. I installed a 12583827 into my 2003 LeSabre and after setting this constant, the AC compressor is disabled below (a desirable) 40 deg F. However, there is a slight catch, the O2 sensors operating range and the O2 heater resistance changed (the field wiring itself remained the same). I chose to leave the 03 original O2 sensors intact and I moved the O2 logic & settings to the (now installed) 12583827. I've ran it this way for a couple of months and all appears to be working fine. My personal view is this level of change is not for everyone and if that is the case, then its probably best to just press the vent button and get it out of auto and be content with having to bring in fresh air when its frigid cold outside. Of course, I would have preferred to have left the original 12583826 installed but I also wanted to have the feature working to disable the AC compressor below a reasonable ambient temperature.

I apologize that I did not update this thread. You did an excellent job of disassembling the dash. I disassembled one as far as you did but you were more logical than me, it was about 100 degrees F when I did it.

I'm on my PC now and I see the one you took apart has the automatic HVAC climate control. I see the IPM, its in your 3rd photograph. Slightly to the right of the screen, it has one mounting screw removed,.

Thanks all for the additional info!

I learned a few things!

the ac comp wont run below like 45 degrees or so (F)
theres nothing wrong with using the ac comp when its colder, its just drying the air. the auto ac hvac system is still adding heat to the air as long as your temperature selection is warmer than outside, even when in vent. so its going to give you dry, slightly heated air

Recirc will fog up the interior in the uber cold since the moisture from breathing is circulated back out and it starts to condense on the windows