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It does add up to being the WTS as you have been told.
The temperature sensor comprises a thermistor and the resistance should reduce when the temperature rises i.e. from a high resistance when the engine is cold. (It has a negative temperature coefficient.)
When cold the resistance should measure 2,000 -3000 ohms and at operating temperature around 300 ohms. From this you will see that a short circuit would result in the engine receiving a signal that the engine is up to temperature when trying to start.
You should first check wiring and connections, then test the WTS if you have an ohm meter, or simply replace it.
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Trevor, New Zealand.
As a child, on cold mornings I gladly stood in cowpats to warm my bare feet, but I detest bull$hit! 
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