Just ordered a new one for my 1.4 as I think the current one is jammed open. Car runs at only around 1/3 on temp display unless in traffic, and heater although nice and warm never seems as toasty as it is in friends cars.

£21.63 all in from Fiat for thermostat and gasket (Part no: 46523118 Thermostat - 55193766 Gasket).

I've not looked under the bonnet at where its located but I assume (and hope) its a fairly quick and easy job to do?

Jon.