Hi, Please can someone confirm my thoughts? My wife has a 1.6 tdci 07 fusion plus. When its cold outside the engine temerature gauge never gets to normal and then drops to around 70 deg when we have the internal heater on max heat and max speed. I've taken it to Essex ford (Main dealer) but they tell me nothing wrong as its becasue its cold outside. I think they are wrong and that the Thermostat is stuck open? If its stuck open that would be why the gauge drops and the intensity of the hot air drops too, correct? Any ideas? Am i right? or is Ford main dealer Right??