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Heater duct in a Chevy K10 1973

Discussion in 'Heat & AC' started by uprising, Jan 9, 2019.

  1. uprising

    uprising Junior Member

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    Joined:
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    Location:
    Germany
    First Name:
    Charly
    Truck Year:
    1973
    Truck Model:
    K10
    Engine Size:
    350
    Ok, than i will check it tomorrow. Thanks! I‘ve heard that there is also a plate on the firewall? Is that true?!?
     
  2. uprising

    uprising Junior Member

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    Location:
    Germany
    First Name:
    Charly
    Truck Year:
    1973
    Truck Model:
    K10
    Engine Size:
    350
    Hey Guys
    I checked the frame but there is no Vin. Does somebody has an other location?
    I also checked the heating, no matter which option i choose, no air is coming out the vents in the dash. I thing the part is really missing. Can somebody check it at his K10 without Ac? Or c10
     
  3. 75gmck25

    75gmck25 Full Access Member

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    Location:
    VA
    First Name:
    Bruce
    Truck Year:
    1975
    Truck Model:
    K25
    Engine Size:
    5.7
    I have A/C in my truck, so I have never looked at the heater in a truck without A/C. However, based on the pictures in my repair manual, you have three cables connected to the back of your dash controls. One moves the heat blend door (same as on an A/C truck), and the other two cables control the diverter doors for defrost/heat. Maybe one of those cables is disconnected.

    If you take out the screws on the bottom of the glove box door, you can remove the entire glove box. This makes it easy to see all the vents behind it, and also see the blend door cable where it attaches to the heater plenum.

    Bruce
     
  4. uprising

    uprising Junior Member

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    Charly
    Truck Year:
    1973
    Truck Model:
    K10
    Engine Size:
    350
    Good morning Bruce,
    i will remove the box and check the cables. In which option should the air came through the dash vents? And how can i switch off the blower? Do i have to replace the old climate control unit?
     
  5. Goldie Driver

    Goldie Driver Full Access Member

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    Location:
    Houston, Texas
    First Name:
    Britt
    Truck Year:
    1980
    Truck Model:
    GMC K1500 Suburban
    Engine Size:
    350
    Please see link below- it shows pictures of the heat and air conditioning switches in our trucks.

    http://www.lmctruck.com/icatalog/csb/t.aspx?Page=2

    If the one in your truck has the Vent option that will allow air thru the dash ducts.

    If your truck does not have a Vent setting then over here it would not have had dash ducts, either.

    If your truck is like ours the blower runs all the time at a low speed - it is called Continuous Ventilation .

    Can you get pictures of your dash and HVAC switch?
     
  6. uprising

    uprising Junior Member

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    Charly
    Truck Year:
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    Truck Model:
    K10
    Engine Size:
    350
    I made some pics from my dash and the ccu. As you can see, i don‘t have a special vent setting. In the last picture, you can see that the vent don‘t have any channel connected in which the air can flow...
    My truck has the same blower like yours! There are three stages for the blower. Which stages does the middle setting has?

    8DF79DB2-5E94-463A-8321-D84513F29ED8.jpeg

    4BBAB0EE-E822-4A4B-9CA1-1FAC63376F12.jpeg

    7833C346-72DB-4313-A7B3-CE2B7133E42A.jpeg

    390CE15E-0188-4BD6-984E-A985B2B9A6B1.jpeg
     
  7. Goldie Driver

    Goldie Driver Full Access Member

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    Truck Year:
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    Truck Model:
    GMC K1500 Suburban
    Engine Size:
    350
    Looks like someone put an ac dash ( or cab ) in place of what was there to begin with .

    My A.C. dash:
    20190113_122709.jpg


    Drivers side low showing the ductwork .






    20190113_122728.jpg



    Passenger side ductwork:

    20190113_123116.jpg
     
  8. uprising

    uprising Junior Member

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    Engine Size:
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    This can be the answer about the different Vin...
    On the passanger side i have the same ductwork but from there, there is nothing to the vents. Does the non Ac dash has no vents?

    I need the original vin! Any other locations?
     
  9. Goldie Driver

    Goldie Driver Full Access Member

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    Truck Year:
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    Truck Model:
    GMC K1500 Suburban
    Engine Size:
    350
    Correct - the non ac dash would not have vents.


    VIN is typically on the dash, visible from the outside.

    20190113_131324.jpg
     
  10. uprising

    uprising Junior Member

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    Truck Year:
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    Truck Model:
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    Engine Size:
    350
    Thanks a lot!
    What is normally in the hole above the control unit in a non ac dash? Then i need a dash with the vents.. Horrible!

    I‘ve learned that the first trucks don‘t have the vin on the dash. There is a plate in the door and maybe on some other places?!
     
  11. Goldie Driver

    Goldie Driver Full Access Member

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    First Name:
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    Truck Year:
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    Truck Model:
    GMC K1500 Suburban
    Engine Size:
    350
    It is a cubbyhole - see below pic.

    [​IMG]
     
  12. uprising

    uprising Junior Member

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    Truck Year:
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    Engine Size:
    350
    Okeeee,
    where can i get these cubbyhole?! Don‘t find something at lmc. I can‘t find a dash molding for my truck without the holes for the vents.
     
  13. EvilGenius

    EvilGenius Full Access Member

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    Location:
    Metro Detroit
    First Name:
    Darien
    Truck Year:
    1985
    Truck Model:
    K10
    Engine Size:
    305
    Since you are overseas, something like eBay is probably your best bet if LMC doesn't sell it.
     
  14. uprising

    uprising Junior Member

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    Truck Year:
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    Truck Model:
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    Engine Size:
    350
    Ebay can be also a problem. A lot of people don‘t deliver to germany but i will try. Thx a lot for the help!
    Maybe i will install an AC :) But there are a lot more themes. Maybe i will generate a new thread with all my questions!
     
  15. uprising

    uprising Junior Member

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    Joined:
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    First Name:
    Charly
    Truck Year:
    1973
    Truck Model:
    K10
    Engine Size:
    350
    What is the correct name for the Cubbywhole or is it cubby?
     

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