Xantia running cold

During the wintertime my Xantia has a tendency to run rather "cold". This must be the thermostat leaking to the radiator ??
Can a "light" tap on a "strategic" position release the stuck valve ??
Theo
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Unlikely... Remember also that at the moment you have the best of a failed thermostat, you might end up giving it that 'tap' only to find that it's now failed in the closed position... :~(
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