1996 Chrysler Concorde Chrysler Concord ATC control

Tiny
AFCUSHMAN
  • MEMBER
  • 1996 CHRYSLER CONCORDE
Heater problem
1996 Chrysler Concorde 6 cyl Two Wheel Drive Automatic

My wife's ac/heater has not been performing since late this summer. The ac only gets cold at random times, and the heater only get hot at random times. When it does work, it seems to be on high. I had water pump problems and replaced that and the thermostat. I have also performed a diagnostic test on the atc system. No codes were present. I then performed a code test on the car with my obd code reader. Still no codes were present. I have also tested the in car ambient control fan/sensor. It holds the tissue in place. Finally, the only thing I notice is that when I hit the auto button to engage the atc, it flashes a couple of times and goes out. When I worked, it would stay lit up.
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Wednesday, January 14th, 2009 AT 8:06 PM

3 Replies

Tiny
JACK42
  • MEMBER
When you scanned the OBD codes, does your scanner do "B" codes or is it a reader for "P" codes which is engine versus body. Ifit wont communicate, the controller could be bad, especially if you hit bumps and it changes things. Have you checked all connections?
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Sunday, January 18th, 2009 AT 7:27 AM
Tiny
AFCUSHMAN
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I'm certain my Actron Pocket Scan Plus OBD II Car Code Reader is good, as it is brand new. As for which type of codes it reads I am not sure without looking in my book. I'm at work right now, so I can't do that. All connections seem to be intact. But I have also run a diagnostic test through the actual heater/air unit. I followed the intructions in my car manual and am certain I did it correctly. Even when I ran this test I am still not getting any error codes. The blower operates fine. The only problem I have noticed is that when I try to engage the automatic temperature control mode, it won't stay engaged. The auto light just flashes. Further more it won't heat properly. I hope this answers your question, and adds a little depth to my question.
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Monday, January 19th, 2009 AT 1:48 PM
Tiny
JACK42
  • MEMBER
This may require more than just a code reader. A scan tool with the capability to go into the body control to read what may be missing, beyond codes. Sometimes the controller wont see a problem, but you can see it with a scan tool. If the light is flashing it obviously has a problem. Will it go into auto mode if you set the temp full cold or full hot?
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Tuesday, January 20th, 2009 AT 7:24 AM

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