I recently had the thermostat housing split apart (the plastic one)
Now i have one of those aluminum ones that comes apart to change the thermostat.

But now i have noticed that my engine randomly starts to steam every now and then, no its not leaking anywhere, it does have a sweet smell of antifreez though. I can just be idle in or not in rain and it just puffs away for a very short period of time. coolant stays at the same levels and oil is fine as well, any ideas?