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Heater Blower Motor 200 1979

posted by  tjodoin on  Mon Jan 22 09:16 CST 2007
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last visit: Thu Sep 25 08:23 CST 2008
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1979 242DL, B21F. After solving the problem of having an oil light on when the ignition is off and having extremely delayed idiot lights (both due to corroded and melted engine wiring harness) I've come to the issue of a heater blower staying on after the ignition has been turned off. If the heater control knob is left on 1,2,3 the blower will stay on after I've taken the key out of the ignition. I have to remember to manual ensure the blower is off before leaving the car.

Would this be another wiring issue or an ignition switch problem? Thanks so much!








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    Heater Blower Motor 200 1979

    posted by  KlausC on  Mon Jan 22 12:49 CST 2007
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    last visit: Fri Oct 24 10:15 CST 2014
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    Yes.

    The blower motor will start with the key in pos I. I don't have the foggiest reason why it is designed like that. If you are having ignition sw problems, why not just change out the sw? It is very easy to do.

    Klaus
    --
    1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi








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      Heater Blower Motor 200 1979

      posted by  tjodoin on  Tue Jan 23 05:03 CST 2007
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      last visit: Thu Sep 25 08:23 CST 2008
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      Well I guess I like to ensure that something is actually wrong with a part before I replace it. In any case, would you happen to have a description of how to replace the ignition switch? All that I have seen describes those where the ignition is on the steering column. Mine is on the dash.








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        Heater Blower Motor 200 1979

        posted by  KlausC on  Tue Jan 23 06:01 CST 2007
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        last visit: Fri Oct 24 10:15 CST 2014
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        More than likely, it is a bad wire.
        The ignition sw is easy to get to (?) so long as you don't mind lying on your back with your head next to the brake peddle :) Take off the kick plate and assume the position. Directly behind the key will be a round connector with 6 or 7 wires connected to it. Un plug it and remove the 2 screws and the aluminum housed switch will fall down on your nose. Putting it back in is harder than taking it out.

        If you have had burned wires in the engine area, you might have missed one. And the easiest way to find it is to use a multimeter and check for continuity. Also follow the wires for the fan from the switch toward the battery. The wire will be "hot", eventhough the fan is in the off position. Pull the fuse for the fan and if the fan no longer works, the problem is before the fuse, on the battery side.

        Have you ever cleaned the fuse panel? It gets really ugly looking after 30 years.

        Klaus
        --
        1975 164 w/174,800mi (Sold) 1995 850T w/91,000mi, 1998 V70R w/129,000mi








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    Heater Blower Motor 200 1979

    posted by  B.C. on  Mon Jan 22 11:50 CST 2007
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    last visit: Wed Mar 28 22:28 CST 2012
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    As I remember, the oil light on with ignition off was due to bad/missing insulation inside the under-the-engine-front harness. The fat red wire is always hot, so if the black oil sensor wire made electrical contact with it, the light would get power through was is supposed to be the ground side, and it could ground somewhere.

    So lets look at the blower fan switch. Somewhere there is 12v positive getting to a place its not supposed to be.

    IIRC the 1979 did not have a connection to the D/61+ lead to the alternator (that's the thin red wire) that started a 10sec timer to delay the compressor clutch engagement until the engine had run for that time. That wire could be another "leak" to check.

    There is a connection to the a/c wiring, so when next the blower remains on "llegally", turn the a/c knob past the "click" and turn it back of off. Any change?

    Good Luck,

    Bob

    :>)







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      Heater Blower Motor 200 1979

      posted by  tjodoin on  Mon Jan 22 11:59 CST 2007
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      last visit: Thu Sep 25 08:23 CST 2008
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      I'll try it out. Don't have a/c on this old volvo however, so I dont know how that will work.

      Just for more info...Once I was able to jiggle the key in the ignition and the blower went off.








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        Heater Blower Motor 200 1979

        posted by  someone claiming to be CB on  Mon Jan 22 12:10 CST 2007 [RELATED]

        replace the ignition switch







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