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 GM Tech (Cam) Your Own Question

GM Tech (Cam)
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27664
Experience:  GM Grand Master Technician 2007. 11 years experience.
Type Your Chevy Question Here...
GM Tech (Cam) is online now
A new question is answered every 9 seconds

hvac venting control - 1996 Silverado...screw..main control arms..flow

Resolved Question:

HVAC venting control - 1996 Silverado. need some pics and part #s. There is a screw missing from one of the main control arms that directs the flow of air. Specifically, the arm that shuts the door to the defrost discharge is off the lever that actuates this little "door". anybody have that exploded view and parts list I can have?
Submitted: 4 years ago.
Category: Chevy
Expert:  GM Tech (Cam) replied 4 years ago.

Greetings and Welcome to Just answer.

There is no screw missing, rather the arm has simply come off the door shaft. This is common. IF the parts of the actuator rods are all there you can install it.

Object Number: 258020  Size: SH

Customer: replied 4 years ago.
is there a snap ring to hold it in place? Why does it keep comming off? How can i fix the problem, and not just correct the symptom? I am a diesel mechanic so I have understanding.
Expert:  GM Tech (Cam) replied 4 years ago.

A touch of silicone or glue should work. It is simply a poor design.


Customer: replied 4 years ago.

bummer. those darned engineers again..... That pic you sent isn't quite what I'm looking at but its close. Please correct me if I'm wrong... no disassembly required, it is just a difficult place to get at, up under the dash in about the center of the cab. (going by memory of last fall.)


Expert:  GM Tech (Cam) replied 4 years ago.
Just above the fuel pedal, yes.
Expert:  GM Tech (Cam) replied 4 years ago.

HOld on, if the eyelet end came off the lever on the door itself then a small flat retainer may work to hold it on.


Customer: replied 4 years ago.

and a little to the right... just about center... possably eve a little to the right of the center of the bell housing "hump".


no, the door end was still connected to the door, it is the other end that connects to the actuating lever that was off last time



Expert:  GM Tech (Cam) replied 4 years ago.

Nope. left side above the fuel pedal.


Customer: replied 4 years ago.
could maybe be that far over... it is hard to bend and reach up in there... I got long arms that don't like to bend that way. I don't think there was a cover, the actuating arm is just tucked up in a very confined space, but exposed. the arm that came off closes the door on the left side, the smaller of the 2 openings for air to pass through. is that making any sense?
Expert:  GM Tech (Cam) replied 4 years ago.
That all sounds correct.
GM Tech (Cam), Chevy Technician
Category: Chevy
Satisfied Customers: 27664
Experience: GM Grand Master Technician 2007. 11 years experience.
GM Tech (Cam) and 3 other Chevy Specialists are ready to help you
Customer: replied 4 years ago.

ok Cam, I'll be getting at that today. I am sorry to hear that there is no screw or retainer to hold that on. I'll try that dab of silicone and we'll see if lasts any longer. Thanks for the help. Probably the easiest $20 you'll make today. LOL

Have a GREAT DAY!!!

Gene in Wyoming

Expert:  GM Tech (Cam) replied 4 years ago.

The retainer to try is the ones like they used to have that held the old cables on, a spring steel retainer or push on nut. Try one of those before glue.

Customer: replied 3 years ago.

Nope, don't need anyt more info. I remember the repair very well. You were absolutely correct on everything!!! The proper fix ( I think) is to redesign the actuator arm, so that the 90 degree end, that slips into the sleve on the door end, is about maybe 3/16 longer so that it protrudes out the other end of the sleve, and has a snap ring or "E" clip grove cut about a 1/16" or so from the end. That would keep that little bugger in there.


Thanks for the followup. All is good.

Have a Terrific Holiday Season!!!!!

Gene in Wyoming

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... seen a spike since October in legal questions from readers about layoffs, unemployment and severance.
Web sites like
...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 was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
< Last | Next >
  • I was having a terrible problem with the wheel bearings on my 98 Chevy Cavalier and I suspect that using this website saved me plenty of time and money. Todd L Rochester NY
  • Wonderful service, prompt, efficient, and accurate. Couldn't have asked for more. I cannot thank you enough for your help. Mary C. Freshfield, Liverpool, UK
  • This expert is wonderful. They truly know what they are talking about, and they actually care about you. They really helped put my nerves at ease. Thank you so much!!!! Alex Los Angeles, CA
  • Thank you for all your help. It is nice to know that this service is here for people like myself, who need answers fast and are not sure who to consult. GP Hesperia, CA
  • I couldn't be more satisfied! This is the site I will always come to when I need a second opinion. Justin Kernersville, NC
  • Just let me say that this encounter has been entirely professional and most helpful. I liked that I could ask additional questions and get answered in a very short turn around. Esther Woodstock, NY
  • Thank you so much for taking your time and knowledge to support my concerns. Not only did you answer my questions, you even took it a step further with replying with more pertinent information I needed to know. Robin Elkton, Maryland

Meet The Experts:

  • Tim's Auto Repair


    Satisfied Customers:

    Have owned a repair shop for 25 yrs.
< Last | Next >
  • Tim's Auto Repair's Avatar

    Tim's Auto Repair


    Satisfied Customers:

    Have owned a repair shop for 25 yrs.
  • Dave Nova's Avatar

    Dave Nova

    Chevrolet Technician

    Satisfied Customers:

    ASE Master Certification. GM World Class Certification
  • Gary's Avatar


    Chevy Technician

    Satisfied Customers:

    15 years GM master tech
  • John's Avatar


    Master A.S.E Automotive technician

    Satisfied Customers:

    A.S.E MasterTechnician A1-A8 w/L1,38 years experience General Motors Master Technician
  • Neal's Avatar


    Chevy Mechanic

    Satisfied Customers:

    Shop Owner and Mechanic on multiple makes.
  • goodwrench9124's Avatar


    ASE Certified Technician

    Satisfied Customers:

    Ase Master Certified, GM Master Certified Tech. Awarded GM Top performer, Hybrid certified
  • Ron Z.'s Avatar

    Ron Z.

    - Chevy Tech -

    Satisfied Customers:

    18+yrs experience. State Inspector and Chevy Diagnostics