Question about 2003 Mercury Grand Marquis

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A/C blows out of the defrost & floor

I have the same problem , At first i blows out of the vents then all of the sudden it goes to the defrost then the floor then back to the defrost and so on ,,,,Does anyone know who can fix this at a reasonable cost?????

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I had this problem on my Lincoln. There is a vacuum operated plunger that shifts from vent to floor. Mine hjad a broken tab that attached to the switch. I remelted the plastic with a slightly warm soldering iron.

Posted on Aug 20, 2009

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Vacuum problem.

Posted on Jul 27, 2009

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1 Answer

Blows hot air on the floor but cold in the defrost


most likely leak in one or more of the vacuum lines and or out door air damper not closing

Feb 27, 2015 | 2013 GMC Acadia

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This is a common problem on this site.
In your case I would look for a vac leak or a sticky blend door.
Since the direction of air flow changes when you are accelerating, I'm going to guess the blend door or doors are controlled by engine vacuum. There may be a vac leak between the dash and the engine, or the blend door may not be able to move back and forth correctly.
Defrost is the default position when a problem occurs, to make sure the windshield is clear of fog or frost.

Jul 19, 2012 | 2005 Mazda Tribute

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Defrost blows constantly? How do i fix it?


does it blow through the defrost vent only when you switch to vent/floor or does it blow through defrost and vent/floor? is it a switch that is just electric or a manual lever that you slide? the manual type will have that problem if the diverter or the linkage behind the lever(in the dash behind the panel......may be able to access underneath) becomes broken or disconnected so that the air is diverted to defrost regardless where you move it.if you can get to it, you will see what is broken or maybe a fastenerr fell off.

Feb 13, 2010 | 1994 Chevrolet C1500

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Heat & air in our 06 Dodge Caravan won't blow out at the floor


unfortunatly yes the vent arm must be brokin and probaly is the cable going to it most of them u can access that by taking the cover where vent turn is located and just have a boo and see if its off or not

Dec 08, 2009 | 2006 Dodge Caravan

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I HAVE A 2001 DODGE DURRANGO THE DEFROSTER IS NOT BLOWING ANY AIR OUT OF TOP OF DASH BUT SEEMS TO BLOW OUT OK ON ALL VENTS AND FLOOR


it sounds like the switch lever for the vents, floor and defrost is not switching the vent door that goes to the defroster hose. You need to pull the switch consol out loose from the dash and follow the cable for the defrost that goes to the hose for the defrost. You might also have a broke switch that won't pull the cable enough to open the air for the defrost hose.

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ck for a vac leak, or hose that came off at firewall for vents.

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check for a vacuum leak in the hose going to the heater controls. Goes from engine compartment, through firewall, into dash to control head. Also, has a vacuum storage canister under hood. When system fails, it defaults to defrost.

Jul 30, 2009 | 1999 Buick Park Avenue

1 Answer

Dash vents will not blow air. Defroster and floor vents blow fine.


Is it a new vehicle? I had a new vehicle that had the same problem. Answer was that the holes weren't punched out of the vent.

May 23, 2009 | 2004 GMC Envoy

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