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 Mike Giddens Your Own Question

Mike Giddens
Mike Giddens, Ford Master Certified
Category: Ford
Satisfied Customers: 70
Experience:  Over 14 years experience, Ford Master Certified in Chassis Repair, Sync System, Hybrid
Type Your Ford Question Here...
Mike Giddens is online now
A new question is answered every 9 seconds

2004 Explorer: I recently changed..blend door..cold air at all vents

Customer Question

My 2004 Explorer has plenty of heat at the floorboards but no heat at mid-level or defroster. I recently changed out the blend door and actuator so I know that's not the problem. All the pneumatic actuators move when you select the different heat (defrost, floor, mid) but I still only get cold air at all vents but the floor. I have checked all the vacuum lines and all the doors seem to be working properly.
Submitted: 4 years ago.
Category: Ford
Expert:  Mike Giddens replied 4 years ago.
Hi, my name is XXXXX XXXXX let me see if I can help you. a couple of questions: 1. Which blend door and actuator did you replace? 2. Does this unit have automatic or manual ac? Do you have good airflow from all vents in all modes?
Customer: replied 4 years ago.
Mike,
I replaced the primary blend door and blend door actuator about 6 months ago. The door is working fine still and had heat from all vents until about a week ago but now we only get heat from the floorboards. It has manual AC. Great airflow from all vents when I select each "zone". All vacuum lines are connected and I can see or hear each door open and close when I select each zone I currently have half the dash removed).
Expert:  Mike Giddens replied 4 years ago.

graphicIs this the blend door actuator you changed #5?

 

 

 

 

Customer: replied 4 years ago.
Yes, it sure is. I purchased an aftermarket blend door (metal) from heater-treater and installed that at the same time. The aftermarket door has a metal arm and bolt on the receiving end (passenger side) and I can see the arm moving freely as I chance the temperature so I know that it's working fine.
Expert:  Mike Giddens replied 4 years ago.

Look at the plenum chamber on top of the evaporator case. Take a close look at all of the actuators for movement and make sure that none of them are broken. The vacuum actuators will still move in and out but if they are broken off of the connectors, they won't open the doors. Bare with me I am just trying to figure this out with my schematics.

Customer: replied 4 years ago.
All the connectors on the actuators are fine. Where is the Plenum exactly?
Expert:  Mike Giddens replied 4 years ago.

The plenum sits on top of the evaporator case right in the center of the dash behind the radio and ac control head. #6. I went back and looked through the blend door operation diagram and everything you are describing, including the actual pinpoint test, points to the temperature blend door actuator. If you want I could send the diagram then you can see how the air flow operates in this system. Let me know.

 

graphic

Customer: replied 4 years ago.
If you could send that diagram it would be appreciated. I plan to remove the metal bar on the receiving end tof the belend door (pass side) that has the bracket that I mentioned to you, The arm that is attached to the receiving side may not be allowing the door to make a free swing as is it causes a stop point, something that the OEM doesn't have

Expert:  Mike Giddens replied 4 years ago.

graphic

 

 

This is the air disribution schematic I was talking about. Numeber 8 being the temperature blend door. Yes check that door closely to see if it is binding. That would not allow your heat to come through.

 

 

Mike Giddens, Ford Master Certified
Category: Ford
Satisfied Customers: 70
Experience: Over 14 years experience, Ford Master Certified in Chassis Repair, Sync System, Hybrid
Mike Giddens and 10 other Ford Specialists are ready to help you
Customer: replied 4 years ago.
Mike,
I also traced the HVAC system and drew the conclusion that the only possibility could be the Blend door. The aftermarket one that I installed had a lever on the receiving side (passenger side) where it came through the ducting. Well the problem was that it was acting like a stop and determining how far the door could open, I removed the arm and it now works like a champ. Thanks for the help and happy holidays!
Expert:  Mike Giddens replied 4 years ago.
I am so glad I could help you. If you need anymore help please contact me and Happy Holidays to 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:

 
 
 
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
< Last | Next >
  • AlvinC answered a question about my Ford truck that only someone with an in-depth knowledge of his subject would have known what was going on. Rich D USA
  • Because of your expertise, you armed me with enough ammunition to win the battle with the dealer. They are installing a fuel filter and fuel pump at no charge to me. Molly USA
  • I needed help with my car on Saturday morning....got a response in 5 minutes, and it was the perfect solution. Thanks again to your service. Jason V. Kirkland, WA
  • I do know, after going though this with JustAnswer, that I can somewhat trust my mechanic but I will always contact you prior to going there. BR New Jersey
  • 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
 
 
 

Meet The Experts:

 
 
 
  • Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
< Last | Next >
  • http://ww2.justanswer.com/uploads/FO/fordguy4u/2011-12-17_222940_HPIM1257.64x64.JPG Ron's Avatar

    Ron

    ASE Certified Technician

    Satisfied Customers:

    20942
    23 years with Ford specializing in drivability and electrical and AC. Ford certs and ASE Certs
  • http://ww2.justanswer.com/uploads/MU/muddyford/2012-6-13_1204_1.64x64.png Chris (aka- Moose)'s Avatar

    Chris (aka- Moose)

    Ford Technician

    Satisfied Customers:

    22382
    16 years experience with Ford.
  • http://ww2.justanswer.com/uploads/JM/jmcdo28/2012-2-23_01655_resized.64x64.jpg John Mc's Avatar

    John Mc

    Ford Technician

    Satisfied Customers:

    5493
    19 years Ford Lincoln Mercury experience
  • http://ww2.justanswer.com/uploads/wmarti7/2009-4-18_04332_Avatar.jpg Chuck's Avatar

    Chuck

    ASE Certified Technician

    Satisfied Customers:

    1684
    33 Years Experience,Ford Senior Master,ASE Master,L1 Advanced Engine Performance
  • http://ww2.justanswer.com/uploads/CR/crzydrvr00/2013-11-3_12123_246347.64x64.jpg Richard's Avatar

    Richard

    ASE Certified Technician

    Satisfied Customers:

    1518
    12 years at a Ford Lincoln/Mercury and Jaguar dealer as a technician and shop foreman.
  • http://ww2.justanswer.com/uploads/BA/baddad1/2014-4-1_23659_avatar.64x64.jpg Mike V.'s Avatar

    Mike V.

    Auto Service Technician

    Satisfied Customers:

    789
    25 years experience on all makes and models, Licensed NYS Inspector.
  • http://ww2.justanswer.com/uploads/lostrider/2009-9-26_23144_php4VNWAA_c1PM1.jpg lostrider's Avatar

    lostrider

    Ford Technician

    Satisfied Customers:

    2940
    ASE Master Technician, Ford Senior Master Technician,Diesel certified, ASE Master, 22 yrs FORD exp.