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Heater and AC only blows through the defrost and floor vents.

(2003 Mercury Grand Marquis)
in Johnstown, PA on July 23, 2012
The control button only reads floor and vent. Floor vent on driver side seems blocked, not much air.
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Popular Answer
of Greg's Orange Auto on July 24, 2012
you may have a blend door issue seek a diag and est
on July 29, 2012
Poss. MODE control motor.
on July 24, 2012
you need to check your vacuum lines under the dash
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