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Q:

when its cold outside my fan for heater and signal lights wont work on 1990 Ford Taurus

Rookie cbe0621eac06868b3efe0d8d1d3611e23c60d3114864ea2ec19a68cfbd3eebab
when it finally gets warm or i hit a good bump orsmack area around glovebow everything works fine
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I hate leading people down the wrong direction or diagnosing without touching the vehicle,but I have replaced literally hundreds of turn signal/multi function switches and blower motors in my 20 years with ford. Not telling you that's what it is but the duck is quacking! also make sure the connectors look good for the blower motor.
thank you