I'm not totally sure because I haven't seen your sled but on mine I noticed the same thing and then noticed that a little would come out of the overflow reservoir going over bumpy trails. I had to change my fluid because it was a few years old and pretty dirty and diluted looking.
smell of antifreeze and no visable leaks usually indicates that the heater core needs replacing
If you can smell it, it is leaking. Have it pressure tested by a professional.
If you smell antifreeze, there must be a leak somewhere. Have the cooling system pressure tested.
i believe your heater core has died
Some people say that the smell of hot antifreeze smells like mold. It could be possible you are smelling the antifreeze from the engine.
If your going through coolant then you have an internal head gasket leak you smell coolant because its getting into cylinder and burning
Check both the heater core as well as the heater hoses for leaks...........
Make sure it is full of coolant. There probably is a small leak causing the smell. Check it cold as sometimes it leaks cold but not hot.
heater core leaking
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.
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