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Rubbing Alcohol Smell

Over the past few days, I’ve noticed a strong rubbing alcohol smell coming from the air conditioner vents after the car has been stopped - at a red light, or parked for a while. What could this be?

Your heater core is leaking anti-freeze.
You need to attend to this right away. It’s not healthy for you at all. Eventually, it won’t be healthy for the car either.

Thanks very much! I’ll take care of it tomorrow.