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Vent stays on defrost all the time also ac only no heat

(1999 Ford Expedition)
in New Bedford, MA on October 01, 2015
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Popular Answer
on October 01, 2015
you have a vacuum leak under the hood, most likely passenger side at firewall.check the smaller hard plastic lines first.start the engine,put A/C on high setting,listen for hissing sounds around the vacuum lines.once you find the leak,cut the hose and repair it.repair fittings and hose is cheap at parts house.vacuum leak will cause the blower motor to default to the defrost mode.easy fix.
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