2003 Grand Marquis A/C Blower Acting Weird

Billy Makris

Asked by Jul 05, 2013 at 04:47 PM about the 2003 Mercury Grand Marquis GS Convenience

Question type: Maintenance & Repair

This is something that has been happening for about a year/year and a half. I will have my
A/C running and it will be running normal, then I will open my windows while driving and
depending on how long I keep my windows open, when I close the windows, the A/C does
not blow that much out of the vents, even when I put the air on high. What can be causing
this. Also, the temperature of the air is not effected by this, only the blowing of the air.

The other issue I have been having is that one vent will blow out most of the air and the other
3 vents will blow out a little bit of air. I have to keep the vent that blows out the most air off in
order for the other 3 vents to blow out close to normal. What can be causing this? I asked
my friend's dad and he specializes in the Grand Marquis/Crown Victorias and he could find
out what the problem is or what is causing it. Again, the temperature of the air is not
effected by this, only the blowing of the air.

Thanks for any help you can give.

2 Answers

my best guess is that you may have a rodent that has built a nest inside your plenum chamber,hope this helps


Beginning in 1973 cars were required to have "positive airflow" through the passenger compartment. To prevent the build up of deadly exhaust gases in the passenger compartment. This is still true today. This is accomplished by a one way air valve or valves. When the car is moving forward or the climate controll blower is on fresh air enters the passenger compartment at the base of the windshield, passes through the passenger compartment, and exits through a small "flapper" door located on an exterior wall of the trunk. If the vehicle is a van type this door is located in the rear end area exterior wall. Sounds like your "flapper" door is sticking or clogged with debris. Some older vehicles had nocieable grilles in the door jam area. That was the same thing. A one way air valve. HTH. -Jim

Your Answer

Add photo

Related Questions

Search Mercury Grand Marquis Questions

Mercury Grand Marquis Experts

#1 Tracy Hooks
Tracy Hooks
Reputation 4,820
#2 kbro
Reputation 1,910
#3 Js08016
Reputation 1,440
View All

Related Models For Sale

Used Ford Crown Victoria"
11 Great Deals out of 1,634 listings starting at $1,950
Used Lincoln Town Car"
56 Great Deals out of 2,377 listings starting at $1,542
Used Chevrolet Impala"
994 Great Deals out of 35,760 listings starting at $700
Used Mercury Marauder"
50 listings starting at $7,300
Used Cadillac DeVille"
2,394 listings starting at $1,000
Used Ford F-150"
3,219 Great Deals out of 216,434 listings starting at $1,900
Used Honda Accord"
1,344 Great Deals out of 77,641 listings starting at $1,395
Used Ford Taurus"
374 Great Deals out of 23,071 listings starting at $1,400
Used Chevrolet Tahoe"
1,071 Great Deals out of 36,223 listings starting at $1,700
Used Ford Mustang"
737 Great Deals out of 41,260 listings starting at $900
Used Buick LeSabre"
16 Great Deals out of 2,571 listings starting at $1,700
Used Toyota Camry"
1,666 Great Deals out of 98,110 listings starting at $895

Used Cars For Sale

2011 Mercury Grand Marquis For Sale
4 Great Deals out of 45 listings starting at $4,995
2010 Mercury Grand Marquis For Sale
8 Great Deals out of 123 listings starting at $3,299
2009 Mercury Grand Marquis For Sale
4 Great Deals out of 130 listings starting at $2,995
2008 Mercury Grand Marquis For Sale
6 Great Deals out of 200 listings starting at $2,500
2007 Mercury Grand Marquis For Sale
10 Great Deals out of 205 listings starting at $1,993