What is causing a coolant temperature gauge malfunction?

1997 NISSAN HARDBODY
130,000 MILES
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DONALDP8934
  • MEMBER
  • 2 POSTS
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 12:30 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
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 12:57 PM
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DONALDP8934
  • MEMBER
  • 2 POSTS
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 1:03 PM
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RASMATAZ
  • ✓Experienced Mechanic
  • 75,988 POSTS
I'll be waiting
Jul 7, 2012 at 1:07 PM
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