What would cause your car to fill with the smell of burning rubber when the defrost is on?

SOUNDS LIKE THE BUSHINGS IN THE BLOWER MOTOR

Answer

Check your heater core...it may be dried out. This can cause a rotten egg smell.

Answer

can also be valve cover gasket and you just don't smell it when the air isn't on.

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Burning smell new car?  Burning rubber smell in car?  What causes a smell when turning on the defrost?  What does it mean when you run the defrost smells like something is burning?