Question about 2003 Mercury Grand Marquis

1 Answer

2003 grand marquis a/c does not come out vents,only defrost and floor

Posted by on

Ad

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    Superstar:

    An expert that got 20 achievements.

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

  • Mercury Master
  • 4,369 Answers

The vacuum harness connected to the back of the control head is not fitting tightly any more. Pull narrow trim panel covering control head. remove 4 screws holding control head on.
Pull control head back. Fit 2 ten inch tie straps so they hold the vacuum harness (5 hose) tight to the control head. You can remove 2 torx bolts to lift bottom cover if necessary.
Vacuum harness is $20 F5VY-19C827-A, but I doubt you will need it.

Hold it tight with your hand to test before you do repair.

Gov't requires system to fail safe to defrost if a vacuum leak occurs.
I can post a photo of repair if necessary.

If that does not fix, Gino in California fixes internal control leaks.

Posted on Jul 26, 2010

Ad

6 Suggested Answers

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
Best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of.(from cars to computers, handyman, and even drones)
click here to download the app (for users in the US for now) and get all the help you need.
Goodluck!

Posted on Jan 02, 2017

Ad
chuck943
  • 783 Answers

SOURCE: Vent control

You have a vacuum leak.Defrost is the default postion(no vacuum).
See if you can locate the small black vacuum line that goes inside the vehicle on the passenger side near the heater core. The trace it back,should see it going to a canister then to the intake manifold.Make sure it is not disconnected or broken somewhere.

Posted on Mar 02, 2009

alicantecoli
  • 22246 Answers

SOURCE: 2000 Mercury Grand Marquis will only blow hot air when ac is on

needs re-gassing because one line should be hot (feed) and the return cold , This is a specialist job do not attempt to do it yourself because its extremely dangerous with very high pressures involved

Posted on Jun 21, 2009

roniecon
  • 6927 Answers

SOURCE: i have a 2003 grand marquis the air conditioning

nope but ya can look in junk yard and save lots of mula

Posted on Jul 05, 2009

  • 34 Answers

SOURCE: Blender door not working correctly on 2003 grand

not blend door, blend door is responsible for mixing hot air from heater core side with cold air from evaporator side of the system. you have a problem with your panel doors it may be an electrical problem with signals from you heater control module or a vacuum problem or you may have damaged components inside your dash. your vehicle will default to defrost setting automatically if there is a problem in the system

Posted on Apr 07, 2010

  • 324 Answers

SOURCE: 2003 gmc Yukon 5.3 ..2WD air conditioner blows

A vacuum hose that controls the little door that switches where the air blows from is off, its gonna be a real chore the find which one and take the dash out to get to it, but you might get lucky and be able to look underneath the dash from the passenger side and actually see it, good luck

Posted on Jun 19, 2010

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

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.

Feb 01, 2014 | 2007 Mercury Grand Marquis GS Sedan

2 Answers

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

Jul 14, 2012 | Cars & Trucks

1 Answer

2003 Grand Marquis LS Ultimate ac switches from blowing in dash vents to defroster vents on its own. What controls the valve and where is it located?


Does it only change when going uphill, or under heavy acceleration? Or is it just when ever it feels like it? Generally, it's vacuum controlled and on a Ford, loss of vacuum when accelerating or pulling a grade under heavy loads can be normal, causing the air to come out of the defrost. To answer your question, the blower door is located in the dash, generally behind the radio area.

Good luck!

May 22, 2010 | 2003 Mercury Grand Marquis

1 Answer

Blender door not working correctly on 2003 grand Marquis. Bows out defrost but not vents. Occasionly out the vents but not often


not blend door, blend door is responsible for mixing hot air from heater core side with cold air from evaporator side of the system. you have a problem with your panel doors it may be an electrical problem with signals from you heater control module or a vacuum problem or you may have damaged components inside your dash. your vehicle will default to defrost setting automatically if there is a problem in the system

Apr 07, 2010 | 2003 Mercury Grand Marquis

1 Answer

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

Sep 11, 2009 | 2005 Mercury Grand Marquis

1 Answer

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.

Aug 06, 2009 | 1984 Mercury Grand Marquis

1 Answer

Climate control


the ac system on those vehicles are vacuum operated so they can change with acceleration. however it sounds like the head unit on your may be allowing for vacuum to bleed off.

Apr 24, 2009 | 2003 Mercury Grand Marquis

1 Answer

2003 Grand Marquis


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..............

May 29, 2008 | 2003 Mercury Grand Marquis

Not finding what you are looking for?
2003 Mercury Grand Marquis Logo

Related Topics:

1,192 people viewed this question

Ask a Question

Usually answered in minutes!

Top Mercury Experts

yadayada
yadayada

Level 3 Expert

76846 Answers

fordexpert

Level 3 Expert

5546 Answers

Colin Stickland
Colin Stickland

Level 3 Expert

22246 Answers

Are you a Mercury Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...