Air conditioner

Asked by May 24, 2017 at 01:15 PM about the 2007 Mercury Grand Marquis

Question type: General

When I turn on the air conditioner the air only comes out of the defrost vent
not the vents on the dash  the way it used to so as a result it does not work
very good. Is there a relay that changes the air flow? Thanks Darwin

3 Answers


Heat-A/C vent controls are vacuum controlled, so you have a cracked vacuum line, or pinched hose in dash. If you're handy take glovebox out, and then start car (have a flashlight handy) to see what's not moving correctly.


If your heater control is digital it may need to be replaced. Air coming out of the defrost and or floor vent is typical of a bad control module.

Had the same problem. Bought a rebuilt ac controller from Automotive Scientific. Works perfect. Fix the problem immediately and its a fifteen minute swap. Don’t mess with the core as its another $50 bucks if the core is unusable. If the problem is in the vacuum controlled controller under the dash or in the interior flap itself, it is a major replacement problem. Entire dash has to be removed to get at it properly. Not a cheap date.

Your Answer:

Grand Marquis

Looking for a Used Grand Marquis in your area?

CarGurus has 1,177 nationwide Grand Marquis listings starting at $1,950.


Mercury Grand Marquis Experts

  • #1
    Tracy Hooks
  • #2
  • #3
View All

Related Models For Sale

Used Lincoln Town Car
32 Great Deals out of 1,289 listings starting at $495
Used Ford Crown Victoria
723 listings starting at $2,932
Used Chevrolet Impala
729 Great Deals out of 23,729 listings starting at $763
Used Ford F-150
4,040 Great Deals out of 222,424 listings starting at $1,795
Used Dodge Charger
677 Great Deals out of 30,221 listings starting at $1,200
Used Cadillac DTS
39 Great Deals out of 1,096 listings starting at $2,400
Used Chevrolet Tahoe
942 Great Deals out of 39,289 listings starting at $1,500
Used Ford Mustang
711 Great Deals out of 39,907 listings starting at $1,795
Used Chrysler 300
612 Great Deals out of 17,864 listings starting at $1,800
Used Ford Taurus
238 Great Deals out of 14,962 listings starting at $1,995
Used Honda Accord
1,190 Great Deals out of 87,330 listings starting at $1,200
Used Chevrolet Silverado 1500
2,897 Great Deals out of 177,484 listings starting at $1,500

Used Cars for Sale

2011 Mercury Grand Marquis For Sale
31 listings starting at $6,850
2010 Mercury Grand Marquis For Sale
5 Great Deals out of 70 listings starting at $3,900
2009 Mercury Grand Marquis For Sale
54 listings starting at $2,795
2008 Mercury Grand Marquis For Sale
4 Great Deals out of 78 listings starting at $1,950
2007 Mercury Grand Marquis For Sale
89 listings starting at $2,995

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use. Content will be removed if CarGurus becomes aware that it violates our policies.