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That is a odd one can I try to help you on this ?
I take it you have not tried anything yet ?
2 items really coolant temp sensor could be going to ground after that I would go for the gauges itself which is more likely does it bong at you to tell you it is overheating ?
That is the annoying thing when are you next driving it ?
does it keep bonging until you restart ?
I have a cheap solution if you want that ?
Disconnect the plug on the engine temp sender and fit a aux gauge so you can still monitor engine temp cheap and simple and no bonging.
It will work if you get time please rate me regards Gavin.