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Disconnect wires on the thermo switch and test resistance when car is cold and resistance when warm. Cold should be high to the point of no continuity, warm should have low resistance and continuity.
Think my sort of Father in Law is a bit alcoholic, only he and I drank last night and tonight. He has gout, and I know why...I'm still on the coffee at midday, he will have a Ricard or two.
Have you got a multimeter? May have asked before but am drunk.