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Thread: Faulty Water Temp Guage

  1. #1
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    Faulty Water Temp Guage

    Hi All,

    I had an interesting one last night.. Driving along at 80km/h on a clear road on a cool night (8 deg C) my water temp gauge was getting hot.. I have an Engine Watch Dog that is fitting with the probe on the head just near the water pump but it was showing 54 deg C. I pulled over and could touch the thermostat housing - it was hot, but not enough to burn me only touching it for a short time. Did the following:

    - Checked the coolant - level OK.
    - Cap tight, holding pressure.
    - No boiling sound and the engine bay didn't feel hotter than usual.
    - Could touch Thermo housing (it was hot, but not scolding)

    I took a gamble that the gauge wasn't reading accurately and continued to drive the 10km home. The Engine Watch Dog Gauge stayed between 53 and 57 and the water temp gauge stayed in the red unless I braked to a brisk stop then it would go down to 3/4, but rise again as soon as I drove off.

    When I got home the water temp gauge was almost off the scale. I measured the temperature of the sender in the thermo housing with a laser sighted infra-red thermometer and it read 70.4 Deg C. (the brass nut around the sensor).

    I bled it at the Thermo housing and the heater and only clean coolant came out (no bubbles).. so I'm assuming that the water temp gauge is kaput.

    How do I tell if the sender or the gauge is the problem? Should I just replace them both with a VDO kit etc?
    Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
    Brutus: 1969 109 ExMil 2a FFT (loved and lost)

  2. #2
    Bearman's Avatar
    Bearman is offline TopicToaster Gold Subscriber
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    Sounds like an earth problem to me.
    Cheers......Brian
    1985 110 V8 County
    1998 110 Perentie GS Cargo 6X6 ARN 202516 (Brutus)

  3. #3
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    Brian your blood is worth bottling mate. I had discounted that because the fuel and volt meter gauges are on the same earth but were all working fine...

    The earth was loose on the back of the gauge.
    Hercules: 1986 110 Isuzu 3.9 (4BD1-T)
    Brutus: 1969 109 ExMil 2a FFT (loved and lost)

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