MY 1999 FORD TAURUS IS NOT FLOATING PROHIBITED AIR BY A HEATER OR DEFROST WHAT HAVE BEEN A LITTLE SUGGESTIONS?

My 1999 Ford Taurus is not floating prohibited air by a heater or defrost what have been a little suggestions? When we paid for a automobile it was over heating. The use engine light was upon as well as cylinder 1 was skip fireing. we had did all else so we put a little retard [...]

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