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The sensor is located in the center of your H3 behind the grill in front of the radiator. Mine is currently reading -10f below actual temp. My research on this problem leads me to believe my sensor may be fouled with debris. Waiting for decent weather to give mine a good wash out. Hoping this will clear trouble...
Another side note on this problem is when changing my oil filter recently I reached forward and noticed the rubber flap that drops down when shields are removed for access. This flap when moved around holds significant amounts of road debris. Including leaves, bugs, papers & other junk not visible from view. It shakes down easily and certainly improves cooling and air flow. This could effect Temp Gauge sensor as well