Temperature gauge has always, after a few minutes sat in the middle of hot/cold (no numbers) previously.
Recently, after a couple of mins setting off, it rises to the middle as expected, but after about 6 miles/10 mins it shoots right up to HOT (no lights or anything come on) then settles back down after a couple mins/miles.
It seems to only do this on the first journey of each day (ie after an overnight park). It can sit at work for 8 hours and it's fine on the journey home.
Anyone know the likely culprit given the above - Coolant Temp Sensor? Thermostat?
TIA
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