Chrysler Repair: 1999 Chrysler Concorde ATC: code 26, 1999 chrysler concorde, automatic temperature control

Question
QUESTION: I'm having a problem with the automatic temperature control. I cannot get it to go back into automatic. It stays in manual all the time and I also noticed that the compressor isn't kicking on when I hit the A/C button. Do you think it could be a bad compressor? It was working fine but when it went into manual it stopped.

ANSWER: Hi Ron,
I just noticed your question in the "pool", sorry for the delay.
I would suggest that you take advantage of the self-test capability of the ATC control. With the ignition in the run position, simultaneously press and hold the floor, mix and defrost buttons (the right three buttons, respectively:lower, upper, upper), the display will begin to blink, then release the buttons. Then wait while the unit does its diagnosis and watch for any two digit numbers to appear in the readout. After the first number, press the 'panel' button to display another code, if present, etc. Let me know the numbers, if any, and we can go from there. On the AC it may just be low on refrigerant, so check that out at an AC shop rather than think something is wrong with the compressor. The compressor clutch will not operate if the pressure in the system is too low.
Roland

---------- FOLLOW-UP ----------

QUESTION: I did the self test and came up with the number 26. The compressor was low on refrigerant. But it looks like there is a leak in the AC system. I'll have that checked out at the shop though.

Thanks,
Ron

Answer
Hi Ron,
The 26 code is about the in-car temperature sensor which is located on the lower left corner of the ATC control panel where there is an opening and also a small fan that blow cabin air over the sensor. So it could be the fan (test for movement of a thin piece of light weight paper held close to the opening). With the engine running the little fan should be operating. If not then remove the console and replace the fan. If the fan is good and the code 26 persists, then you either have to get a used unit at a wrecking yard or buy a new control because the temp sensor may not be available separately. But check with a dealer on that matter. Because of the mal-behavior of the control panel it may be that your control is bad anyway. To get to the control for removal just remove the snap-on bezel (gently pry edge with a wooden stick) for the center console which gives you access to screws for removal of the unit. If there is an ash receiver in the unit, remove that first before the bezel.
Roland