06 second gen 2.0 petrol. Last winter I started to notice that when I turn on the heater, there is strong burnt smell. At first I blamed coolant, which was leaking from radiator and got finally fixed only in summer. Now as winter is creeping once again and weather is getting colder, it seems the issue is back. My rad and thermostat are new. New coolant, doesn't seem to have any leaks, however, sometimes there is a slight smell of something burnt when I turn the heating and blowing on. It passes off in a minute tops. Carpet seems dry. Could this be coolant leaking into heater core? Any way to easily check it at home?