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Defrost works poorly vents mist into cab

(1999 Ford F-150)
in Carver, MA on January 28, 2010
My defrost works poorly, the blower seems ok and the heat gets warm, I changed the thermostat. However, I get a mist blowing into the cab of the truck with a sicky sweet smell and antifreeze leaks from under the dashboard on the passenger side. Unsure what is the problem?
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Popular Answer
It sounds very much like the heater core has sprung a leak. You need to get this checked out as soon as possible as the heater radiator will burst and flood the inside of your car with hot sticky coolant.
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on May 16, 2010
Try reversing the hoses that run to your heater core. Reversing the flow back washes the heater core and improves the flow.
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