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Erratic Temp Gauge 700 87

posted by  someone claiming to be Drew L on  Sat Nov 11 13:58 CST 2000 [RELATED]

I've owned my '87 760 Turbo for about a year and a half now and and after a few fixes (i.e. AMM, vacuum hoses) but this whole time the dash temp gauge has jumped all over the place. I mean constantly jumping up about the midline then back down to nothing. It's never gone above the midline line but I'm to make a long trip and would like to be able to rely on it. Any ideas? Thermostat? Electrical?

Thanks







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    Re: Erratic Temp Gauge 700 87

    posted by  someone claiming to be Ted Grevers on  Sun Nov 12 13:12 CST 2000 [RELATED]

    Hi,

    By any chance did you install the Green Radiator cap? When Volvo replaced mine at one of my routine services, it screwed up my temp gauge. The pressure was so high that it started screwing up my gauges, blowing hoses, and ultimately my radiator. I put the original black cap back on it, and all was well!

    Good luck.

    T







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    Re: Erratic Temp Gauge 700 87

    posted by  someone claiming to be Don Foster on  Sat Nov 11 23:05 CST 2000 [RELATED]

    Drew --

    If you can get inside your instrument cluster (it pulls out as a module) check the nuts securing the temperature gauge (and the fuel gauge, also). The mounting studs for these gauges also serve as the electrical connections, and they tend to loosen after a zillion potholes.

    The next time the gauge reads zero and the engine's hot, lightly tap the dash and see if the gauge jumps up to a normal reading.



    Don Foster (near Cape Cod, MA)







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    Re: Erratic Temp Gauge 700 87

    posted by  someone claiming to be MittenHed on  Sat Nov 11 15:11 CST 2000 [RELATED]

    I'm going to guess electrical. We are told by Don Foster that there is a board on the back of the gauge that can go bad in mysterious ways. Check the archive.






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