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 Big Dave Your Own Question

Big Dave
Big Dave, Shop foreman, Lead Technician
Category: Car
Satisfied Customers: 54
Experience:  6ASE certifications,Electrical,AC,Engine, Steering/suspension,brakes, diagnostics,12years experience
Type Your Car Question Here...
Big Dave is online now
A new question is answered every 9 seconds

1996 Buick Park Avenue: defroster..blow..the fuse panel under dash

Customer Question

1996 Buick Park Avenue w/AC; AC works great from the defroster vents and the floor vents; the adjustable vents on the dash will not blow any air; the fuse panel under dash looks good; HELP
Submitted: 8 years ago.
Category: Car
Expert:  Big Dave replied 8 years ago.

Evening Greg


I have some good news for you. The problem is not electrical. The issue you are describing is due to a lack of vacuum to the a/c control head. Usually a vacuum line under the hood gets disconnect or broken, causing a loss fo vacuum to the control head. The air blowing out of the defrost and floor vents is a default mode.


Locating the line is not difficult. By looking along the firewall you can find the small hard black plastic vacuum line that supplies the control head. Follow it to where it is broken or disconnected. Repair with a small piece of rubber vacuum line and/or reconnect to vacuum.


Feel free to post again if you need further assistance with this.


Thank you


Dave

Customer: replied 8 years ago.
Reply to Big Dave's Post: looks like the engine compartment vacuum line is okay; I dropped the glove box and can see a white plastic arm that moves slowly as if vacuum activated; where does the vacuum line attach at the interior of the car OR should I still be looking in the engine compartment [the line is the one that is tapped off the brake vacuum assist, right?]
Expert:  Big Dave replied 8 years ago.

Evening greg


The vacuum line goes from a vacuum source in the engine compartment to the a/c controll head. Remove the control head, and disconnect the vacuum harness on the back of the control unit. There should be vacuum to the black line while the engineis running. If not follow that line and look for the break or the lack of connection.


With no vacuum there is no function. If there is vacuum we can check the individual vacuum motors. We need to start at the beginning. and it allstarts with a vacuum supply.


Not exactly sure where the line is. I dont have the diagrams in front me. I am doing this from memory.


Let me know what you find.


Dave


Customer: replied 8 years ago.
Reply to Big Dave's Post: Thank you for the reply! I only just now got the message. Is the AC control box in the interior under the dash? What is the best method to remove it? I will pay for your help if it helps me make the repair.
Expert:  Big Dave replied 8 years ago.

Morning greg


First thing you need to do is remove the shield underneath the passengers side of the dash. Once you have that removed you gain access to the vacuum harness connector. remove the connector start the vehicle and listen /feel for vacuum at the black hose.


Thank you

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