Don't park under maple trees?
Maybe there's something on the heater core or in your vents.
If you mean "why", then the answer is that there is a leak in the heater core.
Possible that the ac compressor is locking up.
Depends on the smell. if it smells sweet, like antifreeze, then it is probably a leak in the heater core. This is a small radiator that runs from the main radiator and makes hot air for the heater. If it smells like gasoline, may be a gas leak. Do not drive the car, get it fixed by a professional. If it smells like smoke, it may be an oil leak. get it checked.
It smells like butter.
My urine often smells like that but i don't know what it means but get checked out at the doctor's
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the person who answered this was from the phillipines so adobo smells like nothing and i mean it
Very likely.
fresh
I think "smells like roses."
Probably that its rotten
that someone smells like hell!