Whenever I start the car I feel some light but distinct ethyl alcohol-like smell from the A/C vent. It goes away almost immediately. I've never noticed that before - but maybe it's my damn allergies that are letting me breathe just this time of the year
A similar smell appears when somebody else starts my car and I'm by the exhaust.
My coolant is not leaking internally (level is always high). What the heck is it - maybe my O2 sensor is going, and the car burns rich causing this smell?