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heater box

Discussion in 'Tech Discussion' started by sacalit, Sep 21, 2019.

  1. sacalit

    sacalit Junior Member

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    I have a 1987 r10 Chevy truck removed heater box to paint inside and not sure where all the striped hoses go any help appreciated photos even better THANKS
     
  2. chengny

    chengny Full Access Member

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    Pages from ST_330_87_1987_Chevrolet_Light_Duty_Truck_Service_Manual[1].jpg
     
  3. Craig 85

    Craig 85 Full Access Member

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    AC vacuum lines.jpg
     
  4. C10MixMaster

    C10MixMaster Full Access Member

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    AC_1977_vacuum lines.JPG
     
  5. sacalit

    sacalit Junior Member

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    none of these match my vacuum plug behind controller and don't have double actuators thanks still looking
     
  6. chengny

    chengny Full Access Member

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    All control assemblies (and the associated vacuum select valve) used in the C/K & R/V 1,2 & 3 series were the same from 85 - 91.

    cont.JPG

    valve.JPG


    I'm not sure what you mean by a "double actuator"? Do you mean an actuator with tubing connected to both sides of the diaphragm? There is only one like that - the HEAT/AC mode actuator. The port for the heat side is hard to see. Its buried between the actuator housing and the back of the air casing:

    HPIM1593.jpg
     
  7. sacalit

    sacalit Junior Member

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    yes that is what I am talkin about I will have to remove box to see what colored hose goes where arrow is do you know what colored hose goes where arrow is
     
    Last edited: Sep 23, 2019
  8. chengny

    chengny Full Access Member

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    All the hoses mentioned below have a black stripe.

    The DARK Blue hose goes to the HEAT side of the actuator (shown above by the yellow arrow):
    HEAT.jpg

    and the TAN hose goes to the AC side:

    AC.jpg



    BLACK hose goes to the DEFROST actuator:

    DEFROST.jpg

    ORANGE goes to a tee. One side of the tee goes to the OUTSIDE AIR actuator and the other goes to the RECIRC valve actuator (both are ORANGE):

    OAI & Recirc.jpg


    The GRAY hose is the vacuum supply for the system. It connects to a hard plastic tube (black) that passes through the firewall. On the engine side of the FW the plastic tube splits into two branches using either a tee or a wye. Two hoses go to the tee and are connected to the vacuum reservoir and intake manifold.
     
    Snoots and 82sbshortbed like this.
  9. sacalit

    sacalit Junior Member

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    thanks a bunch going to take box off and see if I can connect blue
     
  10. sacalit

    sacalit Junior Member

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    Chengny THANKS for the help with hoses I found the other port after removing box I have another issue but having problems with posting pictures I will get help and show pictures and see If you can help thanks again.Can you Email me so I can send you pictures my email is [email protected]. It is a plenum with a flap on it ,or a actuator with a flap
     
    Last edited: Sep 24, 2019
  11. Craig 85

    Craig 85 Full Access Member

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    I just had my '85 apart. Does this help? The piece in back sits on top of the piece in front. The vacuum pod in the red box is the one with 2 nipples. It opens and closes the flap/door in the red box. The door in yellow controls the hot/cold.

    IMG_2459.JPG
     
  12. sacalit

    sacalit Junior Member

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    I have vacuum actuator with a hinged flap still trying to get you a picture but my phone won't let me . its not in box

    chevy 1.jpg

    chevy5.jpg

    chevy4.jpg

    chevy3.jpg

    chevy2.jpg
     
  13. sacalit

    sacalit Junior Member

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    those are pictures anybody know where that part goes I would appreciate help
     
  14. Craig 85

    Craig 85 Full Access Member

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    It goes in the cowl on the passenger side, upper left of the picture. You have to pull the metal cowl out along with the plastic screen. The longer side of the flap goes towards the engine compartment. Be careful sliding it into the cowl area. Mine was perfect till I flexed it and split it at the seam. I had to get another one off eBay to replace it.

    My truck is at the shop or I'd take a picture. Try to mount it in there and if you have a question post a picture.

    IMG_1433.JPG
     
  15. sacalit

    sacalit Junior Member

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    can't figure out how it goes in and don't have a place to bolt it that I see tried but doesn't go in a picture would help Craig 85 can you get someone from shop to sent a pictre of it mounted so I can try and figure it out or where and how it goes
     
    Last edited: Sep 26, 2019

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