Question about 2005 Mercury Grand Marquis

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2005 Merc. Grand Marquis a/c full blower does not work. a/c goes through defrost vents and/or floor vents. Direct a/c vents go on, but kick off and switch to defrost vents, etc. Someone said it was the vaccum mode motor, is it?

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It not a motor its a module and you have look behind the radio in the dash and find it the dirrection section is not working for the area you dont get air

Posted on Sep 12, 2009

Testimonial: "The help was moderately helpful. However, we wanted more technical info. Like do we have to take the radio out? Can we access module from outside?"

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I have no control over the ac/heater blower motor. EATC replaced no effect


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A/c fan only on high,fan goes from dash vents to floor od deforst


replace the a/c blower motor resister. If it fails again, you will have to replace blower motor.

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Jun 28, 2011 | 2006 Mercury Grand Marquis

1 Answer

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


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.

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Air flow changes by itself from panel to defrost to floor vent. my vehicle is a 2006 merc. grand marquis


the vaccumm motors that actuate the mode doors are vaccumm driven.
if at idle all is ok then under accelleration mode doors change then there is a vaccumm leak in the system. look for a steel can (coffee Can) under the hood. trace the vacumm lines from there.

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sounds like a vacuum problem. Check vacuum lines. Maybe hooked up wrong.

Oct 04, 2009 | 2006 Mercury Grand Marquis

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Air only blows to defrost


The problem is with the blower door actuator. It's vacuum driven and controls the air flow from the defrosters, vents, and floor. With the AC on, open the hood and check the lines (very skinny rubber lines) at the firewall in front of the passenger and work back ward. You're looking/listening for a vacuum leak, either a pinhole or maybe a worn end in need of repair.

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