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Scottsdale Upgrade Questions

Discussion in 'The Garage' started by phantom110, Apr 18, 2007.

  1. phantom110

    phantom110 Registered Member

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    Hello all!
    Just a few questions about parts and upgrades for an '85 C20 Scottsdale with the 350. My biggest question regards the HVAC system. My Scottsdale came with A/C which still works and blows cold and hasn't been retrofitted. My heater controls only have 3 settings: Defrost, Heater and A/C. I was wondering if it's possible to upgrade that control unit to the Delco #15-71268 that has the Economy settings and the different levels of A/C, like Normal, Hi and Bi-Level. ACDelco says it will fit in my vehicle, but doesn't say anything about compatability with upgrades.
    Another question I have regards my dome light. This is minor, I realize, but the dome light doesn't work. The fuse and bulb are both fine. The light won't come on when either door is opened. Is this a bad ground or loose wire? Has anyone else had this problem? I can't seem to figure it out.
    Also, does anyone else have problems with their intermitent wipers? Mine work perfectly on Lo, Hi and Mist, but won't work reliably on Intermitent. Any tips there?
    Thanks in advance!
     
  2. 73k5blazer

    73k5blazer Unplug the matrix cable from the back of your head Premium Member

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    Question 1)
    Ok, I'm no expert in this area, but, if you already have AC, then you should have a vacuum controlled control unit. If that's the case, that's good, you have 1 'input' vacuum line and a whole bunch of output lines. The bi-level control just has more output lines and more vacuum servo motors placed in certain places on the ducts.
    You'd need a diagram to see where you need those servo's and doors that they control, and I just packed away all my parts books because we're moving, I won't see them for a few weeks probably. Your best bet, however, is to go to a junk yard and pull all the pieces you need from a donor. All the ductwork, servos and the control unit. Then replace and repair as nesseasry when installing into your truck.
    Questoin 2)
    Dome lights are neagtive switch items in our trucks. So, 2 things to check, you should always have power (12v) present on one terminal at the light. So check for that with a test light or meter.
    The door pins control the path to ground. What happens is they rust alot, just getting a wrench and turing the hex on the door pin is usally enought to restore the pin-to-body connection. You could also replace the door pin entierly, they rust internally too, the "Help" section at most any auto parts store carries those.
    Question 3)
    Your control box is bad. You need part number 15598496, $36 at gmpartsdirect.com. It's a little black box with aluminum fins tied to the base of the steering column. THis is what usally goes bad. It could also be the switch, part number 7844954. Get a real GM switch if you need to replace that, the aftermarket ones aren't as good. They have notches for the intermittent positions, the GM one has infinite adjustabity it it's intermittent section.
    See also wiper tech post. The color are different, but it might help you in the long run.

    Hope that helps!
     
  3. MuddinManny

    MuddinManny Banned

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    You are the MAN! I needed those exact part numbers for my rig! Awesome! Thank you! I couldn't find them and was pullin' my hair out! You da MAN!

    Wahooo! Intermittent wipers for me! :D

    Manny
     
  4. MuddinManny

    MuddinManny Banned

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    [​IMG] [​IMG] [​IMG] [​IMG] [​IMG]
    2 items in cart
    check out your
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    SEARCH [​IMG][​IMG][​IMG][​IMG][​IMG][​IMG] Advanced Search FAQ View Cart Register Request a Return Customer Service GM Warranty E-Mail Us Tell a Friend Home
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    Core Charge S&H Approx TOTAL Remove Part [SIZE=+1]*[/SIZE]7844954
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    Ouch! Prices are a little higher, but I'm goin' for it!

    Manny
     
  5. GA84K5

    GA84K5 Registered Member

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    This is why it's great to be a member here. I've seen/bumped/almost disconnected that "little box with the huge heat-sink" a couple of times.
    Now I know what it does and now I have a good indication of why my factory intermitant wipers don't work all the time as they should.
     
  6. obijuan

    obijuan 1/2 ton status GMOTM Winner

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    mine have never worked intermittently. thanks. probably wont fix it till its real broke though
     
  7. phantom110

    phantom110 Registered Member

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    Thank you very much for your help! I love being a member here because so many people are willing to lend their expertise; you're all great!
     

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