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!!
a rose that smells just as sweet shekspear
Slightly sweet with chemical overtones.
yes, they do
It can be sweet but it still smells awful.
Rotten fruit or spoiled milk can have a sweet smell but taste sour when consumed.
It hardly smells at all. It isn't sweet.
The sentence in passive voice would be: "Sweet is smelled by the rose."
dead cats. - actually I've heard it smells really nice, quite a sweet odour
cyanide --- probably hydrogen cyanide gas supposedly smells like almonds.
Marijuana smoke smells sweet. (Yes, I have actually smelled it.)