Question about 2003 Mercury Grand Marquis

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2003 Grand Marquis

Not receiving air through vent channel. AC works good, air only comes through floor and DEF. Please advise.

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  • Anonymous Jul 09, 2008

    same problem...

  • Anonymous Apr 22, 2009

    HOW TO REPLACE OR LOCATE THE AC ACUATOR ON A 1999 MERCURY GRAND MARQUIS

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1 Answer

Anand Kumar
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  • Master
  • 2,035 Answers

Check if the ac vent is blocked or the switch may in off position ,or selected the AC position on the ac control.....if does not help get it checked by the service center..............

Posted on May 29, 2008

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1 Answer

2007 merc grand marquis heater air comes out all of the vents and very little out of the defrost vents
Check to make sure the engine vacuum is getting to the heater/ac control. Bad vacuum hose or leak. Many vehicles use engine vacuum to move heater doors and controls. When the vacuum is absent, it usually defaults to air blowing out the AC vents.

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May 22, 2010 | 2003 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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AC will not come out the dash vents all the time. Can lower the fan speed really low and they will sometimes switch back to the dash. All air is coming out the defrost vent.
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1 Answer

Need advise air works all the time but comes out
Check for vacuum leaks under your hood. You probably have a loose, broken or damaged vacuum line. Be sure to check the one that goes to your vacuum pot as well. With your engine running, wiggle as many hoses around as you can see, and listen for a hissing sound.

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unless vacuum hose under dash is loose i doubt it.it will be the blend door assembly expensive to fix

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About to have the same thing repaired or diagnosed today. I'll let you know

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