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Code B11ca comes up as only fault.  Took out glove box and watched movement of the pass. actuator. It moves freely, but in large movements with steady hold on control buttons hot or cold(not smooth and steady). NO clicking or sticking.@John/Horace this has the original heater core and NO under dash work has been done on it. MY understanding of the earlier models with ATC that only fan speed was affected by ATC, as desired temp is set by the operator (could I be wrong?).

Yeah scanning for codes is the best start. My wild guess would be cabin air temp sensor( 55111178AD) or heater core temp (long wire style probe harness) sensor, neither are super pricy, although access might be crappy. You have parts car you can pull from still, so if ATC that would help.    Did this journey have the heater core swapped out ? If so probe could have been disturbed.    

You are replying to a 15 year old thread. Look at the dates before replying. 

3 year old thread.

Well, with the 5 DJ's I've had this is a new problem to encounter. Car has ATC but when TEMP is set to full high, I get full heat out any set position. When I lower the TEMP even one degree on the infotainment screen the temp goes to full cold even though the display shows desired TEMP setting.  I suspect the HVAC module in the center stack behind the infotainment screen and when the sun comes up will hook up my alphaobd program and see if I can find the problem using that.  In the meantime if anyone has suggestions, I'm open to read/try them. 

@ERLdI'd the car run fine

Now just so you are aware....don't think that it will magically let you open the car if you accidentally lock the fob in it. The button on the tailgate ONLY works if the key is located from the tail lights rearward. DO NOT leave the key in the car and hope to be able to open it with the button. I tested this just now before someone in my family does it thinking they will still be able to open it just to make sure. The fob WILL be locked in the car and only opened by another fob or the emergency key.

9/29/2026 update:  Thanks for all the replies/suggestions. on Monday 9/21/2026.   I wrote a polite 635 word  e-mail to the dealership general manager laying out the omitted filter of the latest  oil change and the over torqued lug nuts preventing the tire rotation on 9/16, with scanned copies of the last three service tickets for oil change/tire rotations,   I stopped by the service department about 16:00 the same day to present a DVD with my dash cam video and printed copy of the e-mail. The service manager (not the assistant SM I spoke with on 9/16) said they can't watch the DVD as none of their computers have a DVD drive and policy will not allow foreign thumb drives to be connected.  I showed him the printed copy of the e-mail and he said his GM had already shared it with him and tasked him with correcting the issues. He asked if I had the time today, and he had the oil change with filter performed.  The service manager asked me to bring the vehicle back when I could leave it to address the rear lug nuts and perform the tire rotation, I dropped it off 08:30 on 9/29 and picked it up at 17:05.  The service ticket was $0.00  and listed five lug-nuts and one lug that had to be drilled.

well I started using a new spray wax and I really like it,,,   bought off amazon... Griot’s Garage Ceramic 3-in-1 Wax, SiO2 Spray for Cars, Trucks, and RV’s, Provides Protection and Water Beading on Paint, Wheels, Plastic, Rubber Trim, Chrome, and More,  then I used a microfiber rag and some car wash soap along with a  Synthetic clay bar Sponge that I had bought a long time ago but really didn't use very often and gave the journey a good wash using both at the same time removing old crap or wax and then air dried the journey with my leaf blower ,and then then just used the spray wax like I normally do when I use regular detail spry and then reapplied another coat later on after a few hours,,MAN the journey feels like a baby's butt smooth and slick and has been staying clean as well,I really  like the new wax so much I re-bought the same wax but in a gallon jug ,better price over the long haul,,I am NOT into doing wax jobs (since I am a 73 yr old man) that wears me out so this ended up being something I thought you all might want to try....... Synthetic Clay Bar Ball, SPTA Clay Bar Block, 1Pc Hand Clay Bar Pad for Car Detailing, Clay Bars Pad Auto Detailing, Clay Bar Sponge for Car Detailing    

The FINAL SAY GOODBYE TO "OLD RED"!   The family came at noon today with the young man who will be driving "old red". When he finishes high school this June he is going into the MARINE CORPS, sadly to me as INFANTRY(a GRUNT) as I was an "airedale aviation jet engine MOS. So I came down a little to $750 and the deal is DONE, which ALL were VERY PLEASED. I will miss "old red" as I did form an emotional attachment to him from all the work I had put into him over the last 6 years. My friend will be doing the brake work for them, so he although not ending up with the car for parts, will make a little money instead...again ALL parties HAPPY! Old Red will leave my driveway  for the final time mid week once paperwork is completed.