Foggy windows

The carpets aren't wet, and sometimes you can smell a hint of anti freeze but if it's the heater core wouldn't it of gone long before now, it doesn't lose anti freeze or water, but the window do stay foggy how hard is it to determine just exeactly and the ttuck wI'll setup a q 0m q game or any other game they want to see

Not sure what the last two lines of my response meant, sorry about that. All I'm trying to say is we bought the truck used 2 and a half years ago, have only just now changed the water pump. No other problems but this steamy foggy windows, if it was the heater core wouldn't it have already gone out a long time ago, truck is a 2 wheel drive v8 5.9 liter with 102 000 miles