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Ford F250 AC and heat out of the defroster
I have a 2000 Ford F250 .The AC /and heater work great at low speeds.At about 50 MPH it changes to the defroster.I have looked for a air leak and cannot find one.Also when you start the truck up if the heater is on it smell like something is burning.If you start the truck and wait a minute then turn on the heater it don't smell.
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