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Q:

not defrosting the windshield. Heat coming from vents good not from dash vents on 1992 Mercury Grand Marquis

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
will not switch to floor for heat either. blower won't come on. Could it be a sensor problem?
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