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1995 940 temperature gauge not working

posted by  twistedtree1 on  Sun Aug 23 09:29 CST 2009
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last visit: Mon Jul 8 10:56 CST 2013
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Our 1995 940 volvo sedan has a temperature gauge that is not working. We think it could be the engine coolant temperature sensor that is causing the problem. How do you unplug the connector to test it? How do we remove and replace the sensor it this is indeed the problem. Also what other things should we be looking for to get this gauge working again?








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    1995 940 temperature gauge not working

    posted by  spasske on  Tue Aug 25 13:23 CST 2009
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    last visit: Thu Oct 23 10:11 CST 2014
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    Just to rule out a sticky gauge, have you tried tapping on the dash near the guage?

    I recently was misled when I put a resitor in place of the sensor and the guage worked fine. I ordered the sensor and then figured the guage would stick only on certain occasions.
    --
    Paul NW Indiana '89 740 Turbo 140,000








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    1995 940 temperature gauge not working

    posted by  TONY H on  Mon Aug 24 08:32 CST 2009
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    A single wire to the Temp Sensor under the intake manifold. With the Key in the On position, if you breifly short that wire to the Engine block ( ground) the gauge should start to move to HOT. If it doesn't move at all... The problem is not the sensor but something between the wire and the gauge.
    --
    '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm








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      1995 940 temperature gauge not working

      posted by  twistedtree1 on  Mon Aug 24 10:34 CST 2009
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      last visit: Mon Jul 8 10:56 CST 2013
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      We want to be able to take the temp sensor apart without having to break it or cut wires to test it. Is there a way to do this and if so how?








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        1995 940 temperature gauge not working

        posted by  TONY H on  Mon Aug 24 12:53 CST 2009
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        last visit: Fri Oct 17 16:39 CST 2014
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        The connector that goes to the Sender is a basic Spade lug... just unplug it from the sender and touch it to the engine block to see if the Temp gauge reads a warming up engine. No cutting or mangling of the sender.

        If the gauge on the dash moves, then a good chance the sender is bad.

        You can clip a meter on the sender ( where the wire attaches) and the other lead of the meter to the block of the engine, start the car and see if the resistance changes as the Engine heats up. That's all this sender is, A thermal resistor.
        --
        '75 Jeep CJ5 345Hp ChevyPwrd, two motorcycles, '85 Pickup: The '89 Volvo is the newest vehicle I own. it wasn't Volvos safety , it was Longevity that sold me http://home.no.net/ebrox/Tony's%20cars.htm








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    1995 940 temperature gauge not working

    uid 55's pic
    posted by  john sargent on  Sun Aug 23 11:45 CST 2009
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    last visit: Wed Oct 22 09:07 CST 2014
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    The ECT supplies temperature information to the ECU (engine) and EZK (ignition). It is under intake manifold parts 3 and 4.

    The temperature gauge sending unit is under intake manifold ports 1 and 2.

    Your problem is likely to be bad solder joints on the back of the instrument cluster. You might check them and re-solder as you think is necessary.
    --
    john








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      1995 940 temperature gauge not working

      posted by  someone claiming to be Alan on  Thu Feb 7 09:01 CST 2019 [RELATED]

      On a '93, is it in the block or the head? there is a one wire sensor in the upper block and something else just above it in the head. I don't want to confuse it with knock sensors.








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        1995 940 temperature gauge not working

        uid 27's pic
        posted by  Art Benstein on  Fri Feb 8 07:45 CST 2019
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        last visit: Fri Oct 17 20:10 CST 2014
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        The sensor in the block is the knock sensor. The coolant temperature is measured from sensors in the head.


        --
        Art Benstein near Baltimore

        “The single biggest problem in communication is the illusion that it has taken place.” George Bernard Shaw







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