Question about 2003 Mercury Grand Marquis
Your problem with the blower motor only running on high is caused by a defective blower motor resistor pack. Replace the resistor pack. The problem with the vents is not related to the blower motor, and is caused by a problem with the vent controls. I suspect you have a vacuum leak under the dash.
Posted on May 27, 2011
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Posted on Jan 02, 2017
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