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Temperature sensor functions? 900 1997

posted by  Big Harry on  Tue Jan 31 10:38 CST 2012
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last visit: Sun Sep 21 11:06 CST 2014
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I pulled the coolant temp sensor in the thermostat housing and verified that it did trigger the CPU to start the fan by jumping across the plug terminals, but that had no effect on the temperature gauge. Does the coolant temp sensor output also control the gauge? I'm going to order parts today and want to make certain to order the right one to get the temp indicator working again.

Thanks,








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    Duplicate Post 900 1997

    uid 18083's pic
    posted by  lucid on  Sun Feb 5 15:25 CST 2012
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    last visit: Fri Oct 24 12:31 CST 2014
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    "Does the coolant temp sensor output also control the gauge?"

    Mitchell diagram on a Russian site shows gauge input to cluster terminal A14 coming from ECM terminal B23 via YEL/WHT wire.


    --
    Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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      Duplicate Post 900 1997

      posted by  Big Harry on  Mon Feb 6 17:09 CST 2012
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      last visit: Sun Sep 21 11:06 CST 2014
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      Hi Lucid,

      I picked up my temp sensor today and installed it in the 960. Since the connector wiring was shot, I clipped the connectors off and finished the hook up with shielded spade connectors. I was amazed at how many problems that little $30.00 sensor fixed! When I called the previous owner, he fessed up to having issues with the car for several years, but the Volvo mechanics at both the dealership and a specialty shop couldn't get it fixed. That is why I got the car for $1000.00!

      Thanks,








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    Oops! Trying to reply to Harry's top post 900 1997

    uid 18083's pic
    posted by  lucid on  Sun Feb 5 15:21 CST 2012
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    last visit: Fri Oct 24 12:31 CST 2014
    [RELATED]

    "Does the coolant temp sensor output also control the gauge?"

    Mitchell diagram on a Russian site shows gauge input to cluster terminal A14 coming from ECM terminal B23 via YEL/WHT wire.


    --
    Bruce Young, '93 940-NA (current), 240s (one V8), 140s, 122s, since '63.








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    Temperature sensor functions? 900 1997

    posted by  pierso on  Sun Feb 5 13:54 CST 2012
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    last visit: Sun Feb 24 06:56 CST 2013
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    hi Big Harry,
    on my 1993 2L turbo 940 there's 2 temp sensors. I think I'm right in saying the one nearest the bulkhead (v. difficult to see) tells the computer what temp it is and governs the cooling fan, the one nearest the front of the engine works the temp gauge. You'll also see a sensor stuck in the block - I think that's the knock sensor. From your post you say you've got a sensor in the stat housing, sounds easier to get to than mine. If in any doubt it should say somewhere in the FAQ.

    regards
    pierso








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    Temperature sensor functions? 900 1997

    posted by  aleekat on  Tue Jan 31 12:00 CST 2012
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    last visit: Fri Oct 24 13:19 CST 2014
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    I'm not sure but I have had good luck calling FCPgroton and the tech guys are very helpful.
    --
    Post Back. That's whats makes this forum work.








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      Temperature sensor functions? 900 1997

      posted by  Big Harry on  Thu Feb 2 07:06 CST 2012
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      last visit: Sun Sep 21 11:06 CST 2014
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      I use them for some things, but they are pricey compared to other sites.

      Regards,








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        Temperature sensor functions? 900 1997

        uid 25346's pic
        posted by  GT144 on  Thu Feb 2 08:55 CST 2012
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        last visit: Fri Oct 24 04:32 CST 2014
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        There are two of them on my 940, both under the intake manifold. One drives the temp
        Gauge. The other controls the fan and cold start. When it gave out on my car, the fan ran as soon as i started it up each morning, and would stay running up to 10 minutes after shutdown. And it ran rough at cold start for about 5-10 seconds each morning, with no fast idle.
        --
        1974 144GL, 1996 940 GL LPT







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