Anti-freeze is leaking in to or on to hot engine.
The sweet smell is most probably from the glycol in the radiator. When there is a leak or the engine boils then the water/glycol mixture that finds it's way to hot engine parts will smell sweet. (Glycol is a sugar but it is poisonous DO NOT TASTE IT).
it has a sweet smell!!
the rose is sweet when (it is) smelt.
a rose that smells just as sweet shekspear
Slightly sweet with chemical overtones.
yes, they do
sweet smells of perfume or spray
It can be sweet but it still smells awful.
Sweet, Putrid, and Gasoline
It hardly smells at all. It isn't sweet.
cyanide --- probably hydrogen cyanide gas supposedly smells like almonds.
dead cats. - actually I've heard it smells really nice, quite a sweet odour