This only happens when I first turn on the heat or defroster when my car is cold. I get an odor which smells like coolant. This coolant odor goes away after a few minutes (about 5 to 10 minutes) after the heating system starts to blow hot air into the car's cabin. I've noticed this odor only when I first start my car when my car is cold when I put the heat or defroster on just a few minutes after I warm my car up. The heat setting on the heater/defroster dial is always in the maximum hot position when I turn the heat/defroster on. I would like to know if it's normal to smell this particular coolant odor when I always turn my heat and defroster on? This is happening to my 2002 Mustang V6. I would think that the 4.6 Tech people in here might have a better idea about this problem than the V6 forums because the V6 forums are always dead. That's why I posted it in here.