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What is causing a coolant temperature gauge malfunction?

Tiny
DONALDP8934
  • MEMBER
  • 1997 NISSAN HARDBODY
  • 130,000 MILES
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.
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Saturday, July 7th, 2012 AT 7:30 PM

3 Replies

Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
Check/Test the thermostat if okay-could be airlock try bleeding the cooling system and see what happens-let me know
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Saturday, July 7th, 2012 AT 7:57 PM
Tiny
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.
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Saturday, July 7th, 2012 AT 8:03 PM
Tiny
RASMATAZ
  • MECHANIC
  • 75,992 POSTS
I'll be waiting
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Saturday, July 7th, 2012 AT 8:07 PM

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