where are my resistors located

Discussion in 'The Big Chill' started by canuck buick, Dec 27, 2011.

  1. canuck buick

    canuck buick Silver Level contributor

    All sorts of issues with the controls on my 70 vert.

    - only works in defrost
    - only blows at high speed
    - only blows cold air ( though this might be rectified as I find that once I put the lever to cool I have to manually open the door by hand, for soe reason the wire doesn't push it close.

    Anyways I want to start by checking mu resisitors but have no idea where they are.

    This car sat for twenty years so connections are rusty and I have no idea how to get at the connectors behind the control levers , do I have to remove my dash to do this?
     
  2. buick64203

    buick64203 Just plum crazy Staff Member

    To access the back of the heater controls, you can remove the radio. In order to do that, if the car has A/C, you need to drop the plastic plenum that directs heat to the floor. Then the radio comes out from the bottom of the dash

    If the car has A/C, you should look at the most likely suspect- the blowwer motor relay. If hte relay id bad, it will only blow on high
     
  3. canuck buick

    canuck buick Silver Level contributor

    No radio installed so I guess that is a good thing though I still don't know how to get my hands back there. I have ac, where is this relay located? I thought I read somewhere that it is on the fire wall but I am not sure.
     
  4. buick64203

    buick64203 Just plum crazy Staff Member

    You really need to do yourself a favor and buy a factory service manual. It has all schematics, wiring diagrams and funtional description of how the syatem operates. I wouldnt be able to fix my car without it

    The relay is located on the firewall and is readily available at your local auto parts store. But please, dont just start throwing parts at it until its fixed.

    The blower resistor is located on the evaporator housing

    Remember- "Test....dont guess"
     
  5. electraboat

    electraboat Well-Known Member

    these guys know a whole lot more than me but i had these problems and changed the blower resister to solve....got mine on ebay for 35 ddollars....easy fix if im right,marty
     
  6. electraboat

    electraboat Well-Known Member

    addendum.i bought one on ebay for 35 but fixed mine,,,,,,,,found partially disconnected blower resistor and cleaned contacts ,try first to look and clean may be loose,marty
     
  7. canuck buick

    canuck buick Silver Level contributor

    I have the fischer service manual on cd but I can't find these resistors anywhere. My relay is just clicking now so I will replace it and see what that does.
     
  8. electraboat

    electraboat Well-Known Member


    folow what jason says and also pull out the blower resister. its likely loose or just corroded contacts....let us know when you found the resistor...also there delicate .
     
  9. canuck buick

    canuck buick Silver Level contributor

    Is the blower resistor in a housing of sorts?
     
  10. buick64203

    buick64203 Just plum crazy Staff Member

    If its an A/C car, its in the evaporator core housing.
     
  11. buick64203

    buick64203 Just plum crazy Staff Member

    Also make sure you have vacuum to the black plastic vacuum tank mounted on the firewall. Might be part of your problem
     
  12. electraboat

    electraboat Well-Known Member

    ok.....in my 70 electra it is on the firewall almost touching the passenger valve cover. there is a large plug maybe 2 inches with 4 wires ,that plug attaches to it. you loosen the 2 bolts and out is comes unless it fell inside unless its loose which would cause only high blow, marty
     
  13. canuck buick

    canuck buick Silver Level contributor

    thanks for the replys , mine is and ac car so yes I have determined that the resistors are inside the evaporater. While I was working on this broke the nipple on the ac vacuum tank that mounts on the firewall and it has broken in such away that I don't think I can fix it. My question is that I don't plan to use the ac any ways so can I just bypass it or do I need this for my heating.
     
  14. electraboat

    electraboat Well-Known Member


    how did you find the blower resistor . was it disconnected or corroded,marty
     
  15. canuck buick

    canuck buick Silver Level contributor

    I didn't actually find them but I asume they are behind the wire connector that terminates there as I cab see them nowhere else.
     
  16. buick64203

    buick64203 Just plum crazy Staff Member

    You need the vacuum tank for your heat. Without it your heat will blow cold
     
  17. canuck buick

    canuck buick Silver Level contributor

    yup I guess fleabay, but I am sure other makes will do the same job
     
  18. DeeVeeEight

    DeeVeeEight Well-Known Member

    I removed my resistor and checked it with a meter. It is a very stout resistor and it would take a lot to damage it. I would suggest cleaning the contacts and reinstalling the one you have.

    Here's some pics of the resistor. It is on the a/c box below the heater hoses in the engine compartment. It is usually covered with road grime so it may be hard to see at first.

    [​IMG]

    [​IMG]

    [​IMG]
     
  19. 69GS400s

    69GS400s ...my own amusement ride!

    For the vacuum tank, check in the parts for sale thread for people parting out cars - you should be able to find one easily

    As for the cable that doesnt seem to move the door - there should be a plastic "tang" on the cable that gets screwed somewhere solid. What this does is prevents the cable housing from moving when the inside rod is moved. The tangs can break (usually someone underdash moving stuff around). If this is the case source a cable from someone parting a car. It needs to be the same cable - the tangs are usually color coded

    Mark should have everything you need

    http://v8buick.com/showthread.php?t=238755
     
  20. canuck buick

    canuck buick Silver Level contributor

    Thanks:TU:
     

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