What is causing a coolant temperature gauge malfunction?

1997 NISSAN HARDBODY
130,000 MILES
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DONALDP8934
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The gauge is reading hot quickly and bounces around rapidly. I replaced both of the coolant temp sensor/sending units, nothing changed. I checked the gauge, unplugging it reads cold and grounding it reads hot. The engine is not getting hot, the radiator cap is brand new.
Jul 7, 2012 at 7:30 PM
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RASMATAZ
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Check/Test the thermostat if okay-could be airlock try bleeding the cooling system and see what happens-let me know
Jul 7, 2012 at 7:57 PM
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DONALDP8934
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It was also replaced same time as the coolant temp sensors. Just drove it, the gauge needle move along with any electrical devices, it moves up/down with the blinkers simultaneously, up/down with heater fan on/off, head light also. Must be a ground short, will run a new wire.
Jul 7, 2012 at 8:03 PM
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RASMATAZ
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I'll be waiting
Jul 7, 2012 at 8:07 PM