When mine was leaking -- This is what it looked like
You can see the coolant leak is very obvious. If yours does not look this way then you are not leaking here. The place that was causing coolant smells to get through my vents was the hose that sits at the very back of the engine on the right side that leads up towards the fuse box into the cabin. The hose had cracked and was leaking coolant. It would get into my vents and cause the smell.