Temperature gauge flucuating

[Kali Hissle]

Everything is fine coolant,fan switch,fan,thermostat.....i fixed it but while im driving the needle goes up and down and im afraid its gonna over heat one day soon..i fixed and replaced ebroken issues and idk the needle going up and down is annoying

 

[RealRabbit]

Are you sure its not a bad sensor or gauge.

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[Kali Hissle]

Ill check you may be on to somthing but when it gets hot I get a whiff of heat and coolant in my face when my window is down,so idk...... well what about flushing the system could that cause this if I never flushed it,this the first time I had this problem and I never had to flush the system or that it was needed