How JustAnswer Works:

  • Ask an Expert
    Experts are full of valuable knowledge and are ready to help with any question. Credentials confirmed by a Fortune 500 verification firm.
  • Get a Professional Answer
    Via email, text message, or notification as you wait on our site.
    Ask follow up questions if you need to.
  • 100% Satisfaction Guarantee
    Rate the answer you receive.

Ask Master Tech Lee Your Own Question

Master Tech Lee
Master Tech Lee, ASE Master Tech
Category: Car
Satisfied Customers: 513
Experience:  36 years Domestic and Import Electronics Diagnostic Tech
28531106
Type Your Car Question Here...
Master Tech Lee is online now
A new question is answered every 9 seconds

Cadillac Deville: My cruise control doesnt work

Customer Question

Once I'm at cruising speed, I press the "Cruise Set" button. The message "CRUISE ENGAGED" appears in the information center, but the speed will not hold.

Submitted: 1 year ago.
Category: Car
Expert:  Master Tech Lee replied 1 year ago.

I am checking on the codes. I will be back Leon

 

Codes are P0 code is an oxygen sensor code and the ao code is blend door circuit problem

Expert:  Master Tech Lee replied 1 year ago.
I am looking into the no cruise with light on -Leon
Customer: replied 1 year ago.
Ok great. Thanks Leon. Let me know if you need any other information from me. I am somewhat car savvy, so I should be able to answer some basic questions if you have any for me about the car. - Shawn
Expert:  Master Tech Lee replied 1 year ago.

Need you to check the basic things first. Lets check the vacuum lines first.
graphic

Expert:  Master Tech Lee replied 1 year ago.
graphic
Customer: replied 1 year ago.
I'll check the lines as soon as I get a chance and let you know what I find out. It will likely be tomorrow evening before I get a chance. Other than the visual check, how else can I check the vacuum without an actual vaccum tester?
Expert:  Master Tech Lee replied 1 year ago.
start engine and pull the lines to see if there is suction with your finger.

See you in the evening.


Leon
Customer: replied 1 year ago.

Leon,


 


I checked the vacuum lines under the hood and they were good. However, both were unplugged from the servo! I hooked them back up and snugged the other connections (they were a not quite on all the way). Now the cruise works just fine. I drove it around town for about 30 minutes just to make sure. It slows down about 2 - 3 MPH from where I set it, but it's consistent. I would expect this to be somewhat normal on this age of vehicle. Would you say the same?


 


I'd like to ask a second question about the A040 code (blend door circuit problem). I can either close this one and open a new question or I can just raise the answer price to $56. Let me know what you'd prefer.


 


Thanks for the diagrams, they were extremely helpful.


 


Shawn

Expert:  Master Tech Lee replied 1 year ago.
Assume!! Glade i could help.

About the Ao code. I will be back in the morning to set up testing to remedy that problem. And the O2 code you might just clear the codes and replace o2 sensor.

You can raise the answer price. No sense starting over and we might loose each other to another expert.


Thank you so much, Leon
Customer: replied 1 year ago.

You are very welcome. I'm also glad you could help!


 


Good deal. If you could send me a diagram of where the left o2 sensor is, I would appreciate it.


 


About the Ao code: At first it seemed like my heater wasn't working at all. I changed the thermostat, and made sure the hoses going to the firewall were hot. Then I realized the passenger side heat works (but not at it's best). This is weird in itself because my year model has single climate control as opposed to dual. I took off the glove box and watched the actuator arm move back and forth. It seems like it struggles going from hot to cold but goes smoothly from cold to hot. Again, strange since the A/C blows nice and cold. I made a video of the actuator arm action. I can upload it here if you'd like, or I can post it on YouTube and send you the link.


 


Shawn

Expert:  Master Tech Lee replied 1 year ago.
ok i will - Leon Goodnight, Leon
Customer: replied 1 year ago.

When I raised the price, I didn't see $58 as an option, So I priced at $48 and will just give you a $10 tip to give you what I promised. Smile


 


No need to rush by the way. I'll be traveling immediately after work, but will be back in "fix-it mode" on Saturday.


 


Thanks again,


 


Shawn

Expert:  Master Tech Lee replied 1 year ago.
ok will do, Leon

Have a nice trip
Expert:  Master Tech Lee replied 1 year ago.

I have to leave for two weeks my mom is not well need to go tend to her. If you still want me to help please rate me to stay connected. If not i will loose you to another expert. Sorry if i have caused an inconvenienced to you.

Cheers,

Leon

Master Tech Lee, ASE Master Tech
Category: Car
Satisfied Customers: 513
Experience: 36 years Domestic and Import Electronics Diagnostic Tech
Master Tech Lee and 4 other Car Specialists are ready to help you
Customer: replied 1 year ago.
No worries. I hope your Mom gets to feeling better. I'll be here when you return. Do you have any intuitive guesses about why the heater blows slightly warm on the passenger side, but cold on the driver's side? This is even with the heat all the way up. The higher the blower speed the cooler both sides get. My car does not have dual climate control.

Blessings,
Shawn
Expert:  Master Tech Lee replied 1 year ago.
Because of the bend door is not working correctly. Code AO40. I am still here until Monday due to the snow roads are bad. So When you are ready to start today let me know.

Thank you for the money $31.50 and bonus $7.50
Customer: replied 1 year ago.
You're welcome. I am ready. Do you want me to send you the video I took of the actuator arm action?
Expert:  Master Tech Lee replied 1 year ago.
yes please
Customer: replied 1 year ago.
http://youtu.be/MBQSmp0vyOo

I ran it from hot to cold and vis-versa. It looks like it struggles going from hot to cold, which seems odd to me.
Expert:  Master Tech Lee replied 1 year ago.
ok now at what temp setting ? arm is adjusting to the desired temp setting. If setting is set to the highest it should close the door to not allow any fresh cold air.
Expert:  Master Tech Lee replied 1 year ago.
Need you to remove the arm from the blend door - move the blend door arm and tell me if it moves freely? if you feel some resistance then there is an obstruction - such as something fell into the defroster from top of dash into the blend house. If the arm moves back and fourth freely from one point to the other, then we have an ACP problem.
Customer: replied 1 year ago.

The door moves freely. What is ACP?

Expert:  Master Tech Lee replied 1 year ago.
Air Conditioning Programmer - Do you know how to work the diagnostics from the climate control?
Customer: replied 1 year ago.

Oh, that sounds fun.


 


I have some basic instructions for it.

Expert:  Master Tech Lee replied 1 year ago.
Do you know how to work the diagnostics from the climate control? yes lots of fun
Customer: replied 1 year ago.

Yes. I have some basic instructions for it:

Expert:  Master Tech Lee replied 1 year ago.
ok i am sending this test to you please follow the steps accordingly, Leon

Attachment: 2012-12-30_205338_acp_test.pdf

Customer: replied 1 year ago.

Ok, I followed the steps. Here are the results:


Within 0 - 20 in AS12, AD23 matches accordingly. Between 21 and 78 in AS12, it struggles to match the commanded value in AD23 and will not settle within 60 seconds. From 79 to 99 in AS12, the value in AD23 remains at 78. Is replacing the ACP what I need to do now?

Expert:  Master Tech Lee replied 1 year ago.
Yes AD23 remains constant at 78 you will need to replace ACPACP Location
Customer: replied 1 year ago.

I'm having trouble finding this part. Could you give me part numbers for a few different manufacturers?

Expert:  Master Tech Lee replied 1 year ago.
I can not find it online either call GM Monday and also Call Rock Auto - I use Rock Auto most of the time to save on money and still get quality parts--service@rockauto.com
1-866-ROCKAUTO (762-5288) (NNN) NNN-NNNNbr/>
I am going in the norning to moms - another storm is brewing so please when i get back that if you have not found one - i know i can.

HHappy New Year ! to you and family,


Leon
Customer: replied 1 year ago.

I think I found it. Is this it? http://www.oreillyauto.com/site/c/detail/BWD0/PRG10M/04029.oap?year=1995&make=Cadillac&model=DeVille&vi=1025783&ck=Search_programmer_04029_1025783_1004&keyword=programmer&pt=04029&ppt=C0039

Expert:  Master Tech Lee replied 1 year ago.
That is it great job, Leon
Customer: replied 1 year ago.

Cool. Can you send me some instructions for removing it please? I've been trying to figure it out and can't really tell what all needs to come off.


 


Also, could you send the diagram for the o2 sensor? Thanks and Happy New Year to you and your family as well. Thanks - Shawn.

Expert:  Master Tech Lee replied 1 year ago.
graphic
Expert:  Master Tech Lee replied 1 year ago.
Talk to you in two weeks, Leongraphic
Customer: replied 1 year ago.
Ok great. Thank you so much Leon. Take care. Hope your mom gets to feeling better.
Happy New Year.
Shawn
Expert:  Master Tech Lee replied 1 year ago.
You Bet!! Leon
Customer: replied 1 year ago.
Leon, I replaced the ACP as instructed, but when I ran the diagnostics test, it failed with the same criteria. The readout on ad23 still maxes out at 78 even though the blend door seems to move all the way over. How can I be sure it is all the way over?
Expert:  Master Tech Lee replied 1 year ago.
hello i am back mom is better.

To check for full open - remove rod from blend door and move door to full open and mark the spot. Reconnect rod and run system and see if rod comes close to the spot you marked.
If it Does not come close please disconnect battery for 15 mins, then reconnect. Re-learn computer, start engine - drive 8 to 10 miles. At idle switch through all controls, heater A/C - temp selector from cold to hot vise versa. This will help computer learn its systems again.

I need to know is the cabin temp stable - is it too cold too hot?

Leon
Customer: replied 1 year ago.
Glad to hear your Mom is better. Moms are blessings. The cabin temperature is too cold. The passenger side is not quite as cold as the drivers side. I will check on the door position when I get home. How do I re-learn the computer?
Expert:  Master Tech Lee replied 1 year ago.

Disconnect battery for 15 mins, then reconnect. Re-learn computer, start engine - drive 8 to 10 miles. At idle switch through all controls, heater A/C - temp selector from cold to hot vise versa. Run each selection for 2 min. This will help computer learn its systems again

 

Thank you,


Leon

Customer: replied 1 year ago.

Ok, sorry, I thought "re-learn computer" was a part of the process rather than the result of it. Thanks - Shawn

Expert:  Master Tech Lee replied 1 year ago.
no problem
Customer: replied 1 year ago.

Leon,


I verified the door is fully opening and fully closing all the way. Even with the temperature set at 90, cold air is blowing out of the drivers side. The passenger side is less cold, but not warm by any means. I'm going to go ahead and re-learn the computer anyway, just to see if it will help. What should I do if re-learning the computer does not help?

Expert:  Master Tech Lee replied 1 year ago.
check the heater hoses from the engine area. the ones that go through the firewall, are they hot or is one hotter then the other? Trying to find out if heater core is working ok.
Let me know
Leon
Customer: replied 1 year ago.

The hose on the bottom side is very hot. The one on the top side is cool.

Expert:  Master Tech Lee replied 1 year ago.

This sounds like a heater core problem. Cold one side the other hot - hot water flow is not circulating through heater core. Try flushing coolant first and if this does not work replace heater core. This vehicle does not use a Heater Control valve (Coolant Valve) as coolant is always circulated through the heater core. Rate of coolant flow through the heater core is established by the Coolant Flow Restricter. Temperature is controlled with the Air Mix Door which allows or restricts the flow of air through the heater core case.

Customer: replied 1 year ago.
How do I flush the coolant if I opt to do it myself?
Expert:  Master Tech Lee replied 1 year ago.
I would run a five minute flush chemical like prestone from auto zone. read the instructions on bottle. The flush may help or not. Depending on the amount of debris clogging the heater core.Why the heat is felt some on passenger side is that the core is on that side, compared to the heat felt on drivers side. Most likely you will have to replace the core, esp if it is the original core. Did the code come \back in for the ACP?

Leon
Customer: replied 1 year ago.

Leon - I haven't seen the code come back for the ACP. I've been checking it every few days. I went ahead and bought a new heater core and will flush the whole cooling system since I doubt the car has ever been flushed. Would you recommend I do that before or after I replace the core? Could you send me instructions for replacing the heater core as well? Thanks, Shawn.

Expert:  Master Tech Lee replied 1 year ago.

Here is the step by step fro removing heater core. Glad to know no code for ACP. I do recommend flushing the cooling system then replace core. If you need more help Shawn just ask. Leon

 

 

Remove the glove compartment and insulating panel.
Disconnect the rod to the blend door.
Disconnect the vacuum and electrics from the programmer that is to the right of the heater core housing.
Remove the 2 heater core cover screws and pull the cover off.
Remove the heater core mounting screws and lower the assembly out of the housing. Watch and protect carpeting from coolant leaks.

 

Heater Core R&R

Customer: replied 1 year ago.
How long should it take to change out the heater core?
Expert:  Master Tech Lee replied 1 year ago.
about 1-1/2 to 2 hours

JustAnswer in the News:

 
 
 
Ask-a-doc Web sites: If you've got a quick question, you can try to get an answer from sites that say they have various specialists on hand to give quick answers... Justanswer.com.
JustAnswer.com...has seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like justanswer.com/legal
...leave nothing to chance.
Traffic on JustAnswer rose 14 percent...and had nearly 400,000 page views in 30 days...inquiries related to stress, high blood pressure, drinking and heart pain jumped 33 percent.
Tory Johnson, GMA Workplace Contributor, discusses work-from-home jobs, such as JustAnswer in which verified Experts answer people’s questions.
I will tell you that...the things you have to go through to be an Expert are quite rigorous.
 
 
 

What Customers are Saying:

 
 
 
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
< Last | Next >
  • I would (and have) recommend your site to others I was quite satisfied with the quality of the information received, the professional with whom I interacted, and the quick response time. Thanks, and be sure that I'll be back whenever I need a question answered in a hurry. Stephanie P Elm City, NC
  • used your service this weekend with "Trecers" help. thank you ,thank you, thank you. replaced an A/C fan motor. Local Auto Zone had part. $15.00 "tracer" fee and $40.00 for parts, I saved several hundreds of dollers at a shop. i will recommend you and use you in the future. David L. Richmond, TX
  • 9 dollars, 2 hours of my time, and I drove away. Your diagnosis was right on the mark. Thank you so much. Phil Marysville, CA
  • Lurch. Thank you very much. I had real doubts about this website but your promptness of response, quick followup and to the point answer with picture was incredible. Charles Walnut Creek, CA
  • As a single woman, I really appreciate an excellent and affordable opinion.
    Thank you Geordie, I will not hesitate to contact justanswer in the future!
    Sue Charleston, WV
  • Another great insight to what may be the problem. I will have my mechanic take a look at it tomorrow. Thanks again, Frank...you do indeed know your stuff. Jim Castleberry, FL
  • Excellent reply, and also very quick. Really sounds like the Expert knows what he is talking about. I will be back to use your service when I need more help with my RV. Dutch USA
 
 
 

Meet The Experts:

 
 
 
  • Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
< Last | Next >
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka-Moose)'s Avatar

    Chris (aka-Moose)

    Technician

    Satisfied Customers:

    846
    16 years of experience
  • http://ww2.justanswer.com/uploads/TE/TedG/2012-6-15_14759_avaLarge.64x64.jpg Ted G.'s Avatar

    Ted G.

    ASE Certified Technician

    Satisfied Customers:

    1596
    20 years auto repair experience, ASE Master Tech, Mechanical Failure consultant, Expert Witness
  • http://ww2.justanswer.com/uploads/joecamel90/2008-11-13_03615_head_shot.jpg George H.'s Avatar

    George H.

    ASE Certified Technician

    Satisfied Customers:

    1311
    ASE Master Tech 15+ yrs, AAS Automotive Technology, Factory trained Asian specialist
  • http://ww2.justanswer.com/uploads/AM/amedee/2013-10-24_23656_Amedee1.64x64.jpg Amedee's Avatar

    Amedee

    ASE Master Tech

    Satisfied Customers:

    2367
    ASE Master Tech advanced level specialist
  • http://ww2.justanswer.com/uploads/SU/supermechanic/2013-8-23_03546_500.64x64.jpg Jerry's Avatar

    Jerry

    Master Mechanic

    Satisfied Customers:

    1906
    ASE master, 30+ years. All makes and models. Trouble shooter, shop forman, service manager
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    942
    12 years Ford Lincoln/Mercury Jaguar dealership as a technician and shop foreman reparing all makes
  • http://ww2.justanswer.com/uploads/ST/Steve7654/2012-6-5_215929_japic800x660.64x64.jpg Steve's Avatar

    Steve

    Auto Service Technician

    Satisfied Customers:

    1980
    25+ yrs experience as a professional working technician; ASE L1 master technician