Question about 2003 Mercury Grand Marquis

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The blower motor stays on high all the time. A/C works but will not come out dash vents, comes out defrost and changes to floor when I accelerate. Thanks for your help. Cecil

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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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