When driving with the heat on my BMW's windows get foggy and I have to use the fan to see clearly. Any idea why that happens? Am I doing something wrong?
Check your coolant level. Usually steam with your heater on indicates a leak in your heater core. Not a good situation. Look on the fire wall behind the motor. There is a drain for your dash there. If you have a leak in the dash it should be coming out of there. Fix it right away, it can not only cause you to blow your motor but also ruin your carpet if it leaks out of the dash.
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