Probably - your head gasket is blown. Antifreeze will be coming out of the tail (exhaust) pipe.
watch your coolant level because antifreeze is probably leaking in your heater core, another indication of leaking heater core is greasy film on inside of your windshield and it makes it hard to defrost.
heater core leak
If it's a sweet smell then its probably a heater core leaking antifreeze.
if you can smell antifreeze you need to replace the heater core in the vehicle
no
You have a leaking heater core. You might smell antifreeze if you turn on the defroster.
Antifreeze is used to heat the cab of your vehicle. When you turn on your heat in your cab, it opens up a valve that allows the hot antifreeze to flow from the radiator into the heater core. If there is a leak in the rubber tubes that flow into the heater core, or if the heatercore is damaged, you will smell the antifreeze in the cab of the vehicle. You may need new hoses to the heater core and/or a new heater core.
leaking heater core
heater core possibly plugged and leaking
Blown Heater Core - The heater fan blows past the heater core and if it has a hole in it your antifreeze ios being blown onto your windshield.
Antifreeze will be leaking in the floorboard on the passenger side, there will be a smell of antifreeze through the vents.
If the heater core in your vehicle goes out, you will not be able to use your heater or defroster. You will also notice the smell of antifreeze throughout the vehicle and possibly a film on the windshield from the antifreeze.