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Has my gauge gone haywire?

If the water temp is changing quickly and/or jumping 2 or more dots at a time, I suspect the sensor or wiring. If the swings are slow and steady, then

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Old 11-11-2014, 06:14 AM   #3 (permalink)
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If the water temp is changing quickly and/or jumping 2 or more dots at a time, I suspect the sensor or wiring. If the swings are slow and steady, then Jordo! may be on the right track with the thermostat. Or it could be a faulty readout.

Try monitoring water temp directly from the ECM with an ODB/CAN monitor.
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