2003 MGM a/c blows out defrosters only , have no heat, & the fan only blows on high

Asked by Oct 23, 2016 at 10:27 PM about the 2003 Mercury Grand Marquis

Question type: Maintenance & Repair

Have only A/C blowing out the Defrosters, the fan
only blows on high setting & I have no heat. I tested
the possibility of the air lines being an issue and
when I did I found that the Dan would blow out the
dash , floor as well as defrosters. But can't figure
out the no heat or the fan. So far I'm guessing it's
the Electric controls at the front of the dash. If
rebuilt will this also fix the heat & fan issues or is
there another problem... maybe the heater control
valve ??

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