Hi XXXXX XXX XXX
It sounds like maybe you have a fault with the coolant temp sensor, however i wouldn't like to bet my life on it before carrying out a diagnostic check, so thats what i'd recommend you do first, get the engine fault memory checked, that should give some indication of what the fault could be.
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Andy7731
UK Car Mechanic
NVQ level 3, MOT tester, have 15 years experience in the motor trade, various brands, diagnostics