Heater And Fan Comes On My Itself

[SC1993]

The Heater and Fan will come on my itself , and you can not turn it off. the ATC unit has no light on it. I ran the ATC diagnostic after I turn the car off and it displayed a 36. Is this code telling me the the ATC unit is Bad??

[fdrepairshop]

unit is bad, change the resistor block as well

[autoengine]

Same thing has happened to my 98 Concorde. The fan settings/display on the dash now goes black after about 1 hour of driving, but then comes back on again the next time I start er up. When the display does this bad number, the controls still function -- one just has no visual verification. Any idea what be up?

[stouffer]

How do you perform the ATC self-diagnostic on this unit to get the codes?

[dpetdog99]

Originally Posted by stouffer

How do you perform the ATC self-diagnostic on this unit to get the codes?

1. Make sure your car is running. Turn the heat knob to 75 degrees. It doesn't matter where the fan setting is at but I think it's best at the lowest position.

2. Press the floor, mix and defrost button at the same time. Hold them for a few seconds until the display starts to blink, I think you'll hear a beep also. They are the first, second and last buttons in the top row.

3. Wait for the thing to do its thing. When it's done, it will show codes, if there are any. Press the panel button to see if there is more than one code, the panel button will change it. If you have any codes it will be displayed where the temperature reading normally is.

I get a code 36 when I do it. It is an ATC head communication failure code. I have a spare, but as long as my ATC works for now I'll leave this one in.

Good luck with it.

If you want to see the codes go here http://www.automotiveforums.com/vbul...d.php?t=168327.
I wrote in all of the codes.

Have a good one!!

Dan

[m98person]

hey, dpetdog, what exactly is the ATC head?
i also get ATC head failure code (36), but not sure what it is...
i noticed sometimes that i will have it set to blow out hot air (round 80) and it will blow out freezing cold air (after engine is hot enough...)

[dpetdog99]

Originally Posted by m98person

hey, dpetdog, what exactly is the ATC head?

The ATC head is just the unit in the dash. Where all the buttons and knobs for temp and fan are.

Have a good one!!

Dan

[liquetis]

Hello everyone,

I joined this forum yesterday "Christmas day" because I was having intermitten problems with the climate control panel. It was displaying all the traits everyone has listed here and more. I was getting code 31 when I ran the diagnostic.

I had my father look at it and he noticed that when the plug in the back (8 pin) was wiggled the problems listed here would recreate them selves. So I took it apart like I have done many times before. The only difference this time is that I took the small circut board out of the aluminum back casing and looked at the conection for the 8 pins on the back of the circut board. There were definately cracks in the solder for at least 5 of the 8 pins. I fired up the soldering iron and added some rosin core solder to each of the 8 connections reinforcing them quite a bit. This has resolved the apparent problems. However I have yet to run diagnostics on the panel again because it seems to be working just fine now.

I hope this can help someone before they spend hundreds/thousands on another ATC.

Michael

[dpetdog99]

Originally Posted by liquetis

Hello everyone,

I joined this forum yesterday "Christmas day" because I was having intermitten problems with the climate control panel. It was displaying all the traits everyone has listed here and more. I was getting code 31 when I ran the diagnostic.

I had my father look at it and he noticed that when the plug in the back (8 pin) was wiggled the problems listed here would recreate them selves. So I took it apart like I have done many times before. The only difference this time is that I took the small circut board out of the aluminum back casing and looked at the conection for the 8 pins on the back of the circut board. There were definately cracks in the solder for at least 5 of the 8 pins. I fired up the soldering iron and added some rosin core solder to each of the 8 connections reinforcing them quite a bit. This has resolved the apparent problems. However I have yet to run diagnostics on the panel again because it seems to be working just fine now.

I hope this can help someone before they spend hundreds/thousands on another ATC.

Michael

Cool. That sure is something to think about before buying a new/replacement unit for the car. Hopefully it saves someone some big money if this happens to them.

Have a good one!!

Dan

[AWP9521]

Originally Posted by dpetdog99

Cool. That sure is something to think about before buying a new/replacement unit for the car. Hopefully it saves someone some big money if this happens to them.

Have a good one!!

Dan

If you do have to replace the ATC Panel, try to get a working used one from a wrecking yard if you are unsucessful trying to repair the one you have. If you go to a dealer for one you better hang on to your wallet, I got quoted 450 bucks for one from a dealer!

Sorry about your LHS, I checked out the pics you had posted, glad everybody was unhurt. I had a 95 Concorde that got taken out by a Civic because some "nice lady" let the driver make a left and pull between a lane of stopped traffic on a 7 lane road (3 each direction and center left turn lane) and right into my path. I had no time to react when seeing the nose of the car come through because the next thing I saw a split second later was the airbag! Neither person had any injuries but both vehicles were totalled.