anti freeze smell question

ok i am beginning to smell what seems to be anti freeze when i turn on the heat or defroster. I don't see any signs of it draining into the interior of the car. but the smell is only there for about ten minutes or so. Does anyone have any suggestions as to what it might be and how to go about fixing it. i appreciate any help i can get. Thanks

it helps to know what year model GA you are referring too.

But I would say its probly a heater core leak.