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  1. #1
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    Temperature gauge is pegged while cold

    Hi,
    I just replaced my radiator on my 2000 540i, when I started the engine, the temperature gauge immediately was pegged full scale. It worked fine until I changed the radiator. Does anyone have any idea what could cause this? I don;t have a wiring diagram available, is this the fault mode for open wiring or a short? Thanks.

  2. #2
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    Member No: 4328 jimlev will become famous soon enough jimlev will become famous soon enough jimlev's Avatar
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    Look at the temp sensor on top of the T-Stat (m)

    housing, near where the top radiator hose connects to it. Make sure you have plugged it in all the way.

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    Re: Look at the temp sensor on top of the T-Stat (m)

    When I first started the car, I forgot to plug it in. I plugged it in, and it was pegged full scale. I thought perhaps I got something in the sensor socket so I cleaned it out with electrical part cleaner, but it didn't make any difference. Is it easy to damage this sensor? Is there any way I can test the plug to make sure I didn't open the wiring when I pulled it off? Thanks.

  4. #4
    mlane
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    Yes | No

    IIRC: open=min (cold) temp; short=max (hot) temp


  5. #5
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    Re: IIRC: open=min (cold) temp; short=max (hot) temp

    Thanks a lot, I appreciate your help. I'll check it in the morning.

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    If you have an ohm meter you can check the sensor(

    There are 4 pins in the coolant temp sensor.
    One sensor for the DME, pins 3 & 4 read 2.5K ohms at 20C.
    The other sensor is for the temp gauge in the cluster, pins 1 & 2 read 6.3K ohms at 20C.
    As mlane said the resistance goes down as the sensor heats up which makes the gauge read hotter. You could have a short somewhere.

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