A quick check would be to pull hte thermostat out and:
1 - Dunk it in hot water to check that it opens
2 - Take the car for a drive with it removed to see if the problem is still there.
(Yes, I know running a car without a thermostat for a long time is bad, but I don't think it will do any harm on a short drive to diagnose the problem)
Good luck, it'd be a ncie Christmas present to yourself.
Hen
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