heater core is bad may need a coolant flush
If your going through coolant then you have an internal head gasket leak you smell coolant because its getting into cylinder and burning
To my re-collection, anti freeze will have an oder such as camphor. I haven't really had the opportunity to burn anti freeze or the experience of leakage on a hot engine or manifold. Hey, someone may have a better answer or a different type of smell.
Could be a few things. Does it leak antifreeze? if so, fix the part that leaks. If not, you could have coolant mixing with oil inside the engine, which burns it. check your spark plugs. If they are white, you are probably burning antifreeze - fix immediately. your exhaust will smell "sweet" as well if you are burning antifreeze.
possibly a leaking heater core look for antifreeze dripping into the interior of the vehicle. usually it is the core or hose connected to the heater core.
it's a sweet smell, but it's a nasty smell. it smells like burning coffee and antifreeze. sounds weird but that's pretty much what it smells like
Does it smell like burning antifreeze? Usally it means that the heater-core is going bad. If you do not service it it can be a lot worse. You will end up with Anitfreeze all over you passenger side floor board.
Some moisture (water) is a normal combustion byproduct. Excessive amounts, with a sweet smell, is an indication of an engine burning antifreeze.
You have a coolant leak. Look for an obvious drip or wet spot or have the cooling system pressure tested.
a leak is probably getting on something hot and cooking away
your vehicle may smell like antifreeze while driving because it is overheating
if you can smell antifreeze you need to replace the heater core in the vehicle
A small amount of antifreeze smell may be emitted from the radiator overflow. However if you smell antifreeze you need to make sure there isn't a leak. It may be something simple if you catch it early.