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i have a 2015 wrangler 2 door sport.my temp. gauge keeps fluctuating from half to 3/4 hot.once triggered over heat light.happens on street driving and freeway.heat come on inside when i turn it on from my vents.anyone have had this happen?does this sound like a bad thermostat?any suggestions?
 

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Check for air bubbles in the coolant, and make sure there's nothing blocking the radiator like mud too. Lastly, make sure the ground wires going to the negative battery terminal are tight, one of those is the fan ground and if it's loose the fan won't come on.
 
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