Blower Motor Stays On

Discussion in 'The Big Chill' started by Christopher Spouse Drew, Dec 21, 2018.

  1. Christopher Spouse Drew

    Christopher Spouse Drew Well-Known Member

    Okay guys, I got this car without any a/c parts including most the wiring, so i sourced and bought new parts. I did all the wiring and i believe its done right. When I was done the blower motor would not turn off so i had to unplug the connector to the a/c relay. So i thought it was a faulty resistor, but I replaced it and same result. I sourced a used a/c control for the dash and maybe the blower motor switch has gone bad? I'm going to investigate tomorrow more, but I thought I would post and see if anyone had this problem before.
     
    Last edited: Dec 21, 2018
  2. buick64203

    buick64203 Just plum crazy Staff Member

    So you replaced everything that was missing with factory parts? What speed is the blower motor running at? When its running do you have low medium and high blower speeds?
     
  3. Brad Conley

    Brad Conley Super Moderator Staff Member

    Think "power flow ventilation". Fan is ALWAYS at least low....
     
  4. Christopher Spouse Drew

    Christopher Spouse Drew Well-Known Member

    Its always on high, like a symptom of a bad resistor.
     
  5. Christopher Spouse Drew

    Christopher Spouse Drew Well-Known Member

    I bought original parts like the blower motor/evaporator cases, heater box, a/c controls. I bought after market but correct to original blower motor, wiring connectors, relay, blower motor resistor, evap, etc.)
     
  6. buick64203

    buick64203 Just plum crazy Staff Member

    I don't know about that Brad. I think its like that on automatic climate control cars.

    The resistor lowers the voltage so you can have low and medium. On high, it bypasses the resistor and applies full 12v to the blower for high speed. So replacing the resistor isn't going to do anything. If anything, Id think the contacts in the AC relay on the firewall might be stuck

    Can you take a picture of how you wired it? Like a picture of the wiring on the relay for one
     
  7. BuickV8Mike

    BuickV8Mike SD Buick Fan

    First thought would be a bad switch or relay.
     
  8. Christopher Spouse Drew

    Christopher Spouse Drew Well-Known Member

    The relay is new, and yeah i guess it could be faulty. I think its the original blower motor switch on the a/c controls. but yes, tomorrow im going to take the wire protector off and check the wiring at the relay and ill probably check the relay off the car for proper function.
     
  9. buick64203

    buick64203 Just plum crazy Staff Member

    Make sure you have the wires going to the right spades
     
  10. Brad Conley

    Brad Conley Super Moderator Staff Member

    OK, didn't see that in you initial description.
     
  11. Christopher Spouse Drew

    Christopher Spouse Drew Well-Known Member

    Yeah I will, the only two wires I might have mixed up are of the 3 terminal relay connector, the top two might be switched, we'll see tomorrow.
     
  12. Christopher Spouse Drew

    Christopher Spouse Drew Well-Known Member

    Yeah after looking at the relay diagram on the relay case I saw that I had the two top terminals on the connector switched, I pulled them out of the connector and switched them and all in good working order. I love when its easy.
     

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