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rick corwine Posted on Feb 01, 2014

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2007 merc grand marquis heater air comes out all of the vents and very little out of the defrost vents

When sellect defrost vent a/c floor for air sellection the air blows from all of the vents

1 Answer

Dennis Tomlinson

Mercury Expert 143 Answers
Posted on Feb 01, 2014

Dennis Tomlinson

Mercury Expert

Joined: Mar 09, 2011

Answers

143

Questions

1

Helped

76277

Points

350

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.

4 Related Answers

Anonymous

578 Answers
Posted on Sep 12, 2009

SOURCE: 2005 Merc. Grand Marquis a/c full blower does not

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

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?"

Anonymous

5 Answers
Posted on Dec 21, 2009

SOURCE: 2004 mecury grand marquis heater or ac will not

check the doors in the heater ductin and make sure all the door motors r workin properly

Anonymous

105 Answers
Posted on Jul 27, 2010

SOURCE: air flow changes by itself

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.

Anonymous

1252 Answers
Posted on May 27, 2011

SOURCE: no air blows from vent

Check for a cracked or broken vacuum hose under the hood, close to the cow panel....

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Related Questions:

0helpful

1answer

My 2007 grand marqis only blows hot air from the defroster vents. will not blow any cold air. Need help before spending a lot of money taking out the dash.

If you have electronic automatic temperature control, press and hold off and floor buttons at the same time, with key in the on position, then release and press auto for 1 second.this will put system into self test. If numbers come up,152-52-32- 132-or some code, Google it..most likely the blend door actuator,some have found a way to do it without removing dash at s much lower cost.

Read full answer

Mar 29, 2014 • 2007 Mercury Grand Marquis GS Sedan

1helpful

1answer

My heater does not blow in floor in a dodgeram 1500

the heater vacuum motor and lines needs to be checked.Also get the blend door checked.

NO HEAT ON FLOOR VENTS

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As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?

http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------

No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html

----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------

These will help.

Thanks.

Read full answer

Nov 28, 2012 • Cars & Trucks

0helpful

1answer

No heat from vents

As per your problem mentioned. There are few solved help links to troubleshoot these problems. Go through the list and Click the link below:----

2000 Toyota Avalon: No heat on Passenger Side?

http://whatisbyme.blogspot.in/2012/05/2000-toyota-avalon-no-heat-on-passenger.html

------------

No heat on Oldsmobile Silhouette?

http://technoanswers.blogspot.in/2012/02/no-heat-on-oldsmobile-silhouette.html

------------

Heater blows cold?

http://schematicsdiagram.blogspot.in/2012/02/heater-blows-cold.html

-----------

Heat blows cold on drivers side and hot on passenger side?

http://schematicsdiagram.blogspot.com/2011/12/heat-blows-cold-on-drivers-side-and-hot.html

----------

Hot air on the driver's side vents only?

http://repairhelpcenter.blogspot.com/2012/01/hot-air-on-drivers-side-vents-only.html

--------------

Temperature gauge does not move and no heat when heater is ON?

http://technoanswers.blogspot.com/2012/01/temperature-gauge-does-not-move-and-no.html

-----------

1992 Toyota Camry: A/C Control light Flashing and A/C not Blowing Cold?

http://technoanswers.blogspot.in/2012/04/1992-toyota-camry-ac-control-light.html

--------------

No heat, blower blows only cold?

http://technoanswers.blogspot.in/2012/02/no-heatblower-blows-only-cold.html
----------

Ford F150 Ac only blows through defrost vents?

http://technoanswers.blogspot.com/2012/01/forf-f150-ac-only-blows-through-defrost.html

----------

Dodge A/C come out of defrost vents only?

http://technoanswers.blogspot.com/2012/01/dodge-ac-come-out-of-defrost-vents-only.html

---------

Ac vacuum line on dodge cummins?

http://technoanswers.blogspot.com/2012/01/ac-vacuum-line-on-dodge-cummins.html

---------

Ford ranger AC blows cold through defrost vents instead on cabin vents?

http://technoanswers.blogspot.com/2012/01/ford-ranger-ac-blows-cold-through.html

----------

2005 Chrysler PT Cruiser: A/C Blows Warm?

http://whoisbyme.blogspot.in/2012/06/2005-chrysler-p8t-cruiser-ac-blows-warm.html

-------------

2009 Mercury Grand Marquis: A/C blows Cold From Defrost Vent Only?

http://whoisbyme.blogspot.in/2012/06/2009-mercury-grand-marquis-ac-blows.html

-----------

AC not blowing through Vents on 2007 Chevy Trailblazer?

http://schematicsdiagram.blogspot.in/2012/04/ac-not-blowing-through-vents-on-2007.html

----------

Passenger side temperature is warm air out of dash vents?

http://schematicsdiagram.blogspot.in/2012/04/passenger-side-temperature-is-warm-air.html

----------

These will help.

Thanks.

Read full answer

Nov 28, 2012 • 2006 Ford Taurus

0helpful

2answers

Air Con on my 2009 Mercury grand marquis is giving me problems. Cold air blows out the defrost vents but will not blow out the main vents. Please advise

the blend door in the lwr air vents is stuck it should be down by the squerrl cage also it could be electronically controlled

Read full answer

Jul 14, 2012 • Cars & Trucks

0helpful

1answer

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.

Read full answer

Jul 27, 2010 • 1993 Mercury Grand Marquis

0helpful

1answer

The vent function no longer works, i.e. won't blow

manual or electronic heater/A/C controls?

Could be loose vacuum harness on back of control head. Need to put 10" tie straps on to hold it tight to control head.

Read full answer

May 09, 2010 • 2004 Mercury Grand Marquis

0helpful

1answer

2004 mecury grand marquis heater or ac will not blow out air thru the vents, it will defrost but little air comes out

check the doors in the heater ductin and make sure all the door motors r workin properly

Read full answer

Dec 21, 2009 • 2004 Mercury Grand Marquis

0helpful

1answer

2006 Merc GM, air flow out the defrost only problem.

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

Read full answer

Oct 04, 2009 • 2006 Mercury Grand Marquis

3helpful

1answer

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...

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

Read full answer

Sep 11, 2009 • 2005 Mercury Grand Marquis

0helpful

1answer

I have a Merc G.M. a/c will shift to the dash vents, then to defrost vents then to floor vents, and then start over again. This occurs on auto setting and also on max a/c, normal a/c. Can anybody give me...

sounds like the a/c control computer ,if it is then this is expensive

Read full answer

Jun 06, 2009 • 2004 Mercury Grand Marquis

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My 2007 grand marqis only blows hot air from the defroster vents. will not blow any cold air. Need help before spending a lot of money taking out the dash.

2007 Mercury Grand Marquis GS Sedan

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