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Slightly erratic temp gauge


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6n2 1.4 8v Polo - recently the temp gauge has been acting up. Some mornings, on the way to work, it's fine climbing as normal on the way until it gets to working temp, but then it nosedives when I'm not looking and doesn't budge from min. Other times it doesn't budge even from cold, but most of the time on the way home from work it's fine and stays at working temp all the way home. I hope I've explained it properly. The coolant is just below min, could it be that simple?

It's coming up for an insp service, so will hopefully get sorted at the same time, but just so I'm a bit more clued up, any suggestions?


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