In the morning when I back my '03 maxima out of the garage if I have the windows and roof open I notice a slight sweet smell in the exhaust. I wonder if it is glycol? Anyone else ever have this experience? I noted the coolant level today so I can begin monitoring it.

 

I've noticed some catalytic converters put out some weird odors, though "sweet" smell is usually coolant in the combustion chamber. Just monitor your fluid levels and temp and that will tell you for sure. Blown head gasket or crack not likely, but possible.

 

That sweet smell is Max power!!!