Hi, I have a 2007 1.6 sxi. The heaters work on all settings (i.e 1-4) and the aircon works fine. However, the heaters don't get that hot. Yes they demist the windows and take the chill out the air but you could easily leave them on setting 2 or 3 for the whole journey and you still won't get too warm. Is this the thermostat? Also, no coolant leaks. Thanks.