NOXIOUS COOLANT SMELL INSIDE VEHICLE WHEN HEATER IS ON. COOLANT SMELL COMING FROM ENGINE COMPARTMENT WHEN IT IS WARM. THE WATER PUMP HAS BEEN CHANGED, NEXT REPAIR WAS RE ROUTING COOLANT RESERVOIR, NEXT REPAIR WAS MOLD FOUND IN HEATER CORE COMPARTMENT/CLEANED AND DEODERIZER WAS USED, LAST REPAIR WAS HEATER CORE CASE REPLACED. THIS PROBLEM STARTED WITH A LEAKING WATER PUMP AND HAS NOT BEEN ADDRESSED. SEEMS GM IS TRYING DIFFERENT REPAIRS IN HOPES IT WILL BE FIXED. THE PROBLEM DOESN'T,T SEEM TO BE DIAGNOSED. ONLY HAPPENS IN COLD WEATHER MONTHS WITH THE HEATER ON. HEATED AIR FROM THE VENTS SMELL LIKE BURNED COOLANT. VERY IRRITATING TO THE EYES AND THROAT, EYES ARE WATERY AND SWOLLEN, VERY DIFFICULT TO SEE AND DRIVE. THEN SEVERE COUGHING. WE CAN NOT SAFELY DRIVE LONGER THAN 20 MINUTES. MY DEALER TELLS ME THEY NEVER HEARD OF THIS PROBLEM YET IS QUICK SEARCH OF THE INTERNET SHOWS MANY DOCUMENTED CASES. THE SMELL OF COOLANT IS IN OUR CLOTHES AND THE FABRIC OF THE INTERIOR OF THE CAR. *TR